St. Louis, MO Zoning
Districts & Requirements

Every zoning district in St. Louis with permitted uses, setbacks, height limits, and density requirements — in plain English. St. Louis is an independent city — not part of any county since 1877. The zoning code uses letter districts (A through K) and is cumulative: what's allowed in A is also allowed in B, C, and so on. The code controls density through setbacks and FAR rather than explicit lot coverage percentages. Recent Ordinance 72027 reduced minimum lot sizes for single-family (to 2,500 SF) and two-family (to 1,250 SF/unit) dwellings in districts A through E.

Official Development Code →Interactive Zoning Map →GIS Portal →

15

Zoning districts

6

Overlay districts

293,000

Population

2024

Code adopted

Quick Reference

Find your district, see what you can do. Click any row for details.

DistrictAt a glanceHeightCoverage
ASingle-family only. 2.5 stories / 35 ft base, 3 stories / 45 ft with wider side yards. Large setbacks.2.5 stories / 35 ft (3 stories / 45 ft with 10-ft side yards)Not specified (controlled by setbacks)
BDuplexes allowed. Same height as A. 1,250 SF per unit means most city lots support 2 units.2.5 stories / 35 ft (3 stories / 45 ft with 10-ft side yards)Not specified (controlled by setbacks)
CTownhouses and small apartments. 3 stories / 45 ft. 1,000 SF per townhouse unit, 1,500 SF per apartment unit.3 stories / 45 ftNot specified (controlled by setbacks)
DHigher-density apartments. 3 stories / 45 ft. 850 SF per townhouse unit, 750 SF per apartment. FAR 1.5 for commercial.3 stories / 45 ftNot specified (controlled by setbacks and FAR)
EHigh-rise residential. 8 stories / 100 ft base, taller with step-backs. 250 SF per apartment unit. FAR 2.0.8 stories / 100 ft (taller with 1:5 step-back ratio)Not specified (controlled by setbacks and FAR)
FSmall-scale retail and services. 3 stories / 50 ft. No front or side setback required for commercial. FAR 1.5.3 stories / 50 ftNot specified (controlled by setbacks and FAR 1.5)
GBroader commercial than F. Same 3 stories / 50 ft. More use flexibility for offices and services.3 stories / 50 ft (same as F district)Not specified (controlled by setbacks)
HFull-service commercial. 8 stories / 100 ft (same as E). Auto dealers, large retail, hotels.8 stories / 100 ft (taller with step-backs, same as E district)Not specified (controlled by setbacks and FAR)
IDowntown core. No height cap (200-ft volume rule). No setbacks. No parking requirement. Maximum flexibility.200-ft volume prism (taller with setbacks, +25% on corners)Not specified (no setback requirements)
JLight and medium industrial. Same height as E (8 stories / 100 ft). No new residential unless 40% of frontage is already homes.8 stories / 100 ft (same as E district, taller with step-backs)Not specified (controlled by setbacks)
KAnything goes except residential. Heavy industrial by right. No setbacks. Same height as H (8 stories / 100 ft).8 stories / 100 ft (same as H/E districts)Not specified (no setback requirements)
FBDOverlay that replaces base zoning with form-based standards. Regulates building form, not use. Growing in adoption.Varies by FBD (typically 2-8 stories)Varies by FBD (often 80-100%)
CUPPlanned development overlay. Flexible standards negotiated per project. Common for large-scale redevelopments.Per approved CUP ordinancePer approved CUP ordinance
SUDOverlay for specific uses that don't fit letter districts. Approved by ordinance. More targeted than CUP.Per approved SUD ordinance (often matches base district)Per approved SUD ordinance
LGateway Arch grounds and Jefferson National Expansion Memorial only. No private development.N/A (federal parkland)N/A

Residential — Single-Family

1 district in St. Louis

A

Single-Family Dwelling District

The most restrictive residential district. Single-family detached homes on lots with 25-ft front yards and 25-ft rear yards. The height bonus for providing wider side yards is the key design lever — go from 35 ft to 45 ft by adding 10-ft side yards on both sides.

What you can build

  • ✓Single-family detached home
  • ✓Accessory garage (12 ft max height)
  • ✓Home occupation
  • ✓Church, school, or government building (up to 85 ft with extra setbacks)
  • ✗Duplexes or multifamily
  • ✗Commercial or retail
  • ✗ADUs as separate dwelling units

Key numbers

Height
2.5 stories / 35 ft (3 stories / 45 ft with 10-ft side yards)
Lot min
2,500 SF per dwelling unit
Width
25 ft (pre-existing lots may be narrower)
Coverage
Not specified (controlled by setbacks)
Front
25 ft (or match existing street line)
Side
4 ft each, 10 ft combined (3 ft min on lots <40 ft wide)
Rear
25 ft

What this means in practice

The math on A-district infill: a standard 25-ft-wide city lot with 4-ft side yards leaves 17 ft of buildable width. At 25-ft front and rear setbacks on a 125-ft-deep lot, you get a 75-ft-deep envelope — roughly 1,275 SF footprint per floor. Two-and-a-half stories = ~3,000 SF. For the 45-ft height bonus, you need two 10-ft side yards, which only works on lots 40 ft or wider.

Residential — Two-Family

1 district in St. Louis

B

Two-Family Dwelling District

Adds duplexes and two-family homes to the A-district uses. Same dimensional standards as A, but the per-unit lot area is 1,250 SF for two-family dwellings — the 2025 ordinance change that opened up duplex development across the city.

What you can build

  • ✓Single-family detached home
  • ✓Two-family dwelling (duplex)
  • ✓Conversion townhouses
  • ✓Church, school, government building
  • ✗Triplexes or larger multifamily
  • ✗Commercial or retail
  • ✗Apartments

Key numbers

Height
2.5 stories / 35 ft (3 stories / 45 ft with 10-ft side yards)
Lot min
2,500 SF single-family; 1,250 SF/unit two-family
Width
25 ft
Coverage
Not specified (controlled by setbacks)
Front
25 ft (or match existing street line)
Side
4 ft each, 10 ft combined; 8 ft if unit entrance faces side yard
Rear
25 ft

What this means in practice

The 2025 lot size reduction is the play here. At 1,250 SF per unit, a standard 3,125 SF city lot (25 x 125 ft) supports a duplex. Side-by-side duplexes on 50-ft lots are the bread-and-butter B-district product — two 25-ft-wide units, each with its own entrance. If the unit entrance opens onto a side yard, that side yard must be 8 ft, not 4 ft — plan your entry locations carefully.

Residential — Multifamily

3 districts in St. Louis

C

Multiple-Family Dwelling District (Low)

The first true multifamily district. Townhouses at 1,000 SF per unit, apartments at 1,500 SF per unit. Reduced setbacks compared to A and B — 15-ft rear yard, 10-ft front yard minimum, zero-lot-line possible on one side.

What you can build

  • ✓Single-family and two-family homes
  • ✓Townhouses (attached)
  • ✓Small apartment buildings
  • ✓Conversion townhouses (no lot minimum)
  • ✓Mixed residential types
  • ✗Commercial or retail (need F district)
  • ✗Hotels
  • ✗Industrial

Key numbers

Height
3 stories / 45 ft
Lot min
2,500 SF single-family; 1,000 SF/unit townhouse; 1,500 SF/unit apartment
Width
18 ft (townhouse unit)
Coverage
Not specified (controlled by setbacks)
Front
10 ft min, 50 ft max (match existing street line)
Side
4 ft one side, 0 ft other (or 4 ft both sides)
Rear
15 ft (waivable with 12-ft side yard)

What this means in practice

C-district is where the density starts to pencil. A 5,000 SF lot at 1,500 SF/unit = 3 apartments. At 1,000 SF/unit for townhouses, the same lot supports 5 attached units. The zero-lot-line option on one side is critical for narrow lots — build to the property line on one side, maintain 4 ft on the other. The rear yard waiver (provide a 12-ft side yard instead of a 15-ft rear yard) opens up through-lot development on deep parcels.

D

Multiple-Family Dwelling District (Medium)

Steps up from C with tighter per-unit minimums — 750 SF per apartment unit instead of 1,500 SF. Same height (3 stories / 45 ft) but nearly double the density. The 1.5 FAR for commercial uses opens mixed-use potential.

What you can build

  • ✓Single-family through large apartment buildings
  • ✓Townhouses at higher density
  • ✓Hotels and rooming houses
  • ✓Commercial uses (1.5 FAR)
  • ✓Mixed residential and commercial
  • ✗Industrial uses
  • ✗Heavy commercial
  • ✗Auto-oriented businesses

Key numbers

Height
3 stories / 45 ft
Lot min
2,500 SF single-family; 850 SF/unit townhouse; 750 SF/unit apartment
Width
18 ft (townhouse unit)
Coverage
Not specified (controlled by setbacks and FAR)
Front
10 ft min (same as C district)
Side
4 ft one side, 0 ft other; 8 ft if unit entrance faces side
Rear
15 ft (waivable with 12-ft side yard)

What this means in practice

D-district is where apartment deals start to work in St. Louis. At 750 SF per unit on a 7,500 SF lot = 10 units by right. Three stories at that density is a 30-unit-per-acre product — competitive with most Midwest markets. The 1.5 FAR cap on commercial means a 10,000 SF lot can support 15,000 SF of commercial floor area across 3 stories. The mixed-use play: ground-floor commercial at 1.5 FAR, upper-floor residential at 750 SF/unit.

E

Multiple-Family Dwelling District (High)

St. Louis's densest residential district outside downtown. 8 stories / 100 ft by right, with additional height if you step back 1 ft for every 5 ft above 100 ft. At 250 SF per unit, this is high-rise apartment territory. Found along major corridors like Lindell and Kingshighway.

What you can build

  • ✓High-rise apartment buildings
  • ✓Hotels and extended-stay
  • ✓Townhouses and small multifamily
  • ✓Commercial uses (2.0 FAR)
  • ✓Mixed-use buildings
  • ✗Industrial uses
  • ✗Auto-oriented commercial
  • ✗Heavy manufacturing

Key numbers

Height
8 stories / 100 ft (taller with 1:5 step-back ratio)
Lot min
2,500 SF single-family; 750 SF/unit townhouse; 250 SF/unit apartment
Width
None specified
Coverage
Not specified (controlled by setbacks and FAR)
Front
10 ft min (same as C/D districts)
Side
4 ft under 45 ft; 5 ft + 6 in per 10 ft above 45 ft
Rear
15 ft under 45 ft; 20 ft + 6 in per 10 ft above 45 ft

What this means in practice

250 SF per unit is remarkably permissive — a half-acre lot (21,780 SF) could theoretically support 87 units. The practical constraint is the step-back rule above 100 ft, which reduces usable floor plates on upper stories. At 2.0 FAR on a 20,000 SF lot, you get 40,000 SF of commercial — a substantial office building. E-district sites along the Central West End and Lindell Boulevard are the city's premier high-density residential corridors. Run parking early — structured parking changes the pro forma significantly at this density.

Commercial

3 districts in St. Louis

F

Neighborhood Commercial District

Corner-store and neighborhood-serving commercial. Allows retail, restaurants, offices, and personal services at a walkable scale. No front or side yard required for commercial buildings — build to the sidewalk. Residential uses follow the adjacent dwelling district standards.

What you can build

  • ✓Neighborhood retail and restaurants
  • ✓Professional offices
  • ✓Personal services (salon, laundry, etc.)
  • ✓Mixed-use (commercial + residential)
  • ✓All uses permitted in A through E districts
  • ✗Drive-through restaurants (conditional use in some cases)
  • ✗Motor fuel stations (conditional use)
  • ✗Industrial or heavy commercial
  • ✗Large-format retail

Key numbers

Height
3 stories / 50 ft
Lot min
None for commercial; residential per adjacent district
Width
None for commercial
Coverage
Not specified (controlled by setbacks and FAR 1.5)
Front
None required for commercial (match street line if 25% built)
Side
None if not adjacent to dwelling district; 4 ft if adjacent
Rear
None for commercial (adequate space for trash/loading)

What this means in practice

F-district is your neighborhood mixed-use play. No front setback = build to the sidewalk. No side setback (unless you abut a residential district) = build wall-to-wall. On a 25 x 125 ft lot with no required setbacks, you can build 3,125 SF per floor x 3 floors = 9,375 SF total. At 1.5 FAR the cap is 4,688 SF — so FAR, not height, is the binding constraint. Put a coffee shop on the ground floor and two apartments above. South Grand, Cherokee Street, and The Grove are classic F-district corridors.

G

Local Commercial and Office District

Expands on F-district uses with more commercial flexibility — larger offices, medical clinics, banks. Same height as F (3 stories / 50 ft). Residential density follows D-district standards (750 SF per apartment unit). Commonly found along secondary commercial corridors.

What you can build

  • ✓All F-district commercial uses
  • ✓Banks and financial institutions
  • ✓Medical and dental offices
  • ✓Larger professional offices
  • ✓Apartments above commercial (D-district density)
  • ✗Auto repair or body shops
  • ✗Industrial uses
  • ✗Outdoor storage or sales lots

Key numbers

Height
3 stories / 50 ft (same as F district)
Lot min
None for commercial; 750 SF/unit residential (D-district rules)
Width
None for commercial
Coverage
Not specified (controlled by setbacks)
Front
None required for commercial (same as F district)
Side
5 ft if adjacent to dwelling district; 8 ft each for residential above commercial
Rear
None for commercial

What this means in practice

G-district gives you D-district residential density (750 SF/unit) plus broader commercial uses. That combo makes it ideal for mixed-use: medical office or bank on the ground floor, apartments above. The 8-ft side yard requirement for residential above commercial means your upper-floor plates are narrower than the ground floor on interior lots. Plan the ground-floor commercial footprint to extend beyond the upper-floor residential envelope.

H

Area Commercial District

The broadest commercial district before downtown. Height and area follow E-district rules — 8 stories / 100 ft base, taller with step-backs. Permits auto dealers, large-format retail, hotels, entertainment. Found along major arterials like South Kingshighway and Natural Bridge.

What you can build

  • ✓All G-district uses plus large retail
  • ✓Auto dealerships and repair
  • ✓Hotels and motels
  • ✓Entertainment venues
  • ✓Large-format commercial
  • ✗Heavy industrial or manufacturing
  • ✗Stockyards or chemical processing
  • ✗Residential-only buildings (residential must be part of a mixed-use project or existing pattern)

Key numbers

Height
8 stories / 100 ft (taller with step-backs, same as E district)
Lot min
None for commercial; 250 SF/unit residential (E-district rules)
Width
None
Coverage
Not specified (controlled by setbacks and FAR)
Front
None required for commercial
Side
5 ft if adjacent to dwelling district; 8 ft each for residential above
Rear
None for commercial

What this means in practice

H-district is where auto-oriented commercial goes — car dealers, big-box retail, drive-throughs. But don't sleep on the residential potential: E-district density (250 SF/unit) at 8 stories means serious apartment yield. A 1-acre H-district site on a major corridor could support 150+ apartments in a mixed-use building. The absence of lot coverage limits means your buildable envelope is defined entirely by setbacks and step-back rules. If you're looking at H-district sites near revitalizing neighborhoods, the mixed-use conversion play is strong.

Downtown

1 district in St. Louis

I

Central Business District

St. Louis's most permissive district. No fixed height limit — the code uses a 200-ft volume prism rule that allows taller buildings with setbacks. No front, side, or rear yard requirements. No parking requirements. Found in the downtown core from the Arch grounds to Union Station.

What you can build

  • ✓High-rise office and residential towers
  • ✓Hotels of any size
  • ✓Retail and entertainment
  • ✓Mixed-use of any configuration
  • ✓Essentially any non-industrial use
  • ✗Heavy industrial or manufacturing
  • ✗Stockyards or noxious uses
  • ✗Standalone parking as primary use (without conditional approval)

Key numbers

Height
200-ft volume prism (taller with setbacks, +25% on corners)
Lot min
250 SF/unit (100 SF/unit above 8 stories)
Width
None
Coverage
Not specified (no setback requirements)
Front
None
Side
None
Rear
None

What this means in practice

The 200-ft volume prism rule works like this: your building's total cubic volume cannot exceed what would fit in a box the shape of your lot at 200 ft tall. But if you set back portions of the building, you can go taller — the volume redistributes. Corner lots get a 25% volume bonus. No parking requirement downtown means you skip the most expensive line item in urban development. The Ballpark Village, One Cardinal Way, and recent Washington Ave conversions are all I-district projects. Land downtown trades at $20-60/SF depending on location — compare that with E-district corridors at $5-15/SF.

Industrial

1 district in St. Louis

J

Industrial District

St. Louis's industrial workhorse. Permits manufacturing, warehousing, auto body shops, used car lots, and all I-district commercial uses. The residential restriction is key: no new housing unless 40% of the block frontage is already residential. Height and setbacks follow E-district rules.

What you can build

  • ✓All I-district (Central Business) commercial uses
  • ✓Auto body and fender repair
  • ✓Used car lots and car rental
  • ✓Light and medium manufacturing
  • ✓Warehousing and distribution
  • ✗New residential (unless 40% of frontage is already residential)
  • ✗Heavy industrial requiring conditional use (acid plants, refineries)
  • ✗Stockyards

Key numbers

Height
8 stories / 100 ft (same as E district, taller with step-backs)
Lot min
None for industrial/commercial; 250 SF/unit if residential qualifies
Width
None
Coverage
Not specified (controlled by setbacks)
Front
10 ft min (same as E district)
Side
5 ft + 6 in per 10 ft above 45 ft (same as E district)
Rear
20 ft + 6 in per 10 ft above 45 ft

What this means in practice

J-district is the rezoning opportunity in St. Louis. Neighborhoods like The Grove, Cherokee Street, and Manchester Ave have J-district parcels surrounded by revitalizing residential areas. The 40% residential frontage rule can actually work in your favor — if your block already has enough houses, you can build apartments in J without rezoning. For pure industrial use, the 8-story height limit accommodates modern distribution and flex buildings. J-to-D or J-to-H rezonings are common and generally supported when the comprehensive plan shows a transitioning area.

Industrial — Heavy

1 district in St. Louis

K

Unrestricted District

St. Louis's most permissive industrial district — any use that doesn't violate nuisance law. No residential permitted at all. Height follows H-district rules (8 stories / 100 ft). Primarily found along the riverfront south of downtown and in industrial corridors near rail yards.

What you can build

  • ✓Any commercial or industrial use
  • ✓Heavy manufacturing
  • ✓Chemical processing (conditional)
  • ✓Petroleum storage (conditional)
  • ✓Stockyards (conditional)
  • ✗Residential of any kind
  • ✗Hotels or rooming houses

Key numbers

Height
8 stories / 100 ft (same as H/E districts)
Lot min
None
Width
None
Coverage
Not specified (no setback requirements)
Front
None
Side
None
Rear
None

What this means in practice

K-district land is cheap ($2-8/SF) but has no residential path without rezoning. The value play is buying K-district sites in transitioning areas and pursuing a rezoning to H or E. The riverfront south of the Poplar Street Bridge and areas near the Lemp Brewery complex have K-district parcels that may be rezoning candidates as the city's south-side revival continues. For industrial users, the lack of any setback or parking requirements makes K the most flexible building envelope in the city.

Overlay — Form-Based

1 district in St. Louis

FBD

Form-Based Zoning District

St. Louis adopted form-based zoning as an overlay option. FBDs replace the underlying letter-district rules with standards focused on building form — street walls, setbacks, fenestration, and parking placement. Each FBD is created by ordinance for a specific area. The Delmar Loop, Downtown West, and NorthSide Regeneration are notable FBD areas.

What you can build

  • ✓Varies by specific FBD ordinance
  • ✓Typically: mixed-use, residential, commercial
  • ✓Building form (height, setback, frontage) is regulated, not use
  • ✓Often more permissive than underlying base zoning
  • ✗Uses prohibited by the specific FBD ordinance
  • ✗Building forms that don't match the regulating plan
  • ✗Auto-oriented development (typically)

Key numbers

Height
Varies by FBD (typically 2-8 stories)
Lot min
Varies by FBD
Width
Varies by FBD
Coverage
Varies by FBD (often 80-100%)
Front
Build-to line (typically 0-10 ft)
Side
Varies by FBD (often 0 ft)
Rear
Varies by FBD (often 0-5 ft)

What this means in practice

FBDs are the city's tool for catalyzing specific corridors. If your site is in an FBD, the form-based rules override the base letter district — read the specific FBD ordinance, not the general code. FBDs typically allow higher density and more use flexibility than the underlying zoning. The Delmar Loop FBD, for example, allows 5-story mixed-use on lots that would otherwise be limited to F-district (3 stories / 50 ft). Check the Planning Commission's website for active and proposed FBDs.

Overlay — Planned Development

1 district in St. Louis

CUP

Community Unit Plan

A negotiated zoning overlay for large-scale projects. The developer proposes a site plan with custom standards — height, density, setbacks, uses — and the Board of Aldermen approves by ordinance. CUPs are St. Louis's primary tool for projects that don't fit neatly into letter districts.

What you can build

  • ✓Whatever the approved CUP ordinance allows
  • ✓Typically: large mixed-use developments
  • ✓Master-planned residential communities
  • ✓Institutional campuses
  • ✗Anything outside the approved site plan
  • ✗Changes require Board of Aldermen amendment

Key numbers

Height
Per approved CUP ordinance
Lot min
Per approved CUP ordinance
Width
Per approved CUP ordinance
Coverage
Per approved CUP ordinance
Front
Per approved CUP ordinance
Side
Per approved CUP ordinance
Rear
Per approved CUP ordinance

What this means in practice

CUPs are how Ballpark Village, City Foundry STL, NGA West campus, and most large St. Louis developments get entitled. The process: submit a site plan to the Planning Commission, get a recommendation, then the Board of Aldermen approves by ordinance. Timeline: 4-8 months minimum. The aldermanic courtesy system means your ward alderperson effectively has veto power — engage them before you file. CUPs give you maximum flexibility but zero certainty until the ordinance passes.

Overlay — Special Use

1 district in St. Louis

SUD

Special Use District

Similar to CUP but for specific uses rather than comprehensive site plans. SUDs allow a particular use or set of uses that the base zoning prohibits. Common for institutional uses, unique commercial concepts, and adaptive reuse projects that need zoning relief.

What you can build

  • ✓Specific uses approved in the SUD ordinance
  • ✓Often: adaptive reuse of historic buildings
  • ✓Institutional or cultural uses
  • ✓Unique commercial concepts
  • ✗Uses not specified in the SUD ordinance
  • ✗Changes require ordinance amendment

Key numbers

Height
Per approved SUD ordinance (often matches base district)
Lot min
Per approved SUD ordinance
Width
Per approved SUD ordinance
Coverage
Per approved SUD ordinance
Front
Per approved SUD ordinance (often matches base district)
Side
Per approved SUD ordinance
Rear
Per approved SUD ordinance

What this means in practice

SUDs are the surgical tool — use them when you need a specific use exception without rewriting the entire site plan. Converting a church to a brewery in an A district? SUD. Putting a boutique hotel in a C district? SUD. The process mirrors CUP (Planning Commission recommendation, Board of Aldermen ordinance) but the scope is narrower. Budget 3-6 months for approval.

Parks & Institutional

1 district in St. Louis

L

Jefferson Memorial District

A single-purpose district covering the Gateway Arch National Park and surrounding federal parkland along the riverfront. No private development is permitted. Included here for completeness — if your site abuts the L district, the adjacency affects your views and marketability, not your zoning.

What you can build

  • ✓Federal park facilities only
  • ✓National Park Service structures
  • ✓Public monuments and memorials
  • ✗Any private development
  • ✗Commercial or residential
  • ✗Industrial

Key numbers

Height
N/A (federal parkland)
Lot min
N/A
Width
N/A
Coverage
N/A
Front
N/A
Side
N/A
Rear
N/A

What this means in practice

You can't build in L-district, but adjacency to the Arch grounds is a premium amenity. Parcels in the I-district blocks west of the Arch (along Washington Ave, Market St, and Chestnut St) command higher rents and sale prices due to Arch views. If you're evaluating a downtown site, check the sight lines to the Arch — it's a real value driver for residential and hotel projects.

Development Bonus Program

St. Louis doesn't have a formal density bonus program like some Sun Belt cities. Instead, density increases come through three paths: (1) Rezoning to a higher letter district — straightforward but requires Board of Aldermen approval and aldermanic courtesy gives your ward alderperson effective veto power. (2) Community Unit Plan (CUP) overlay — negotiated standards for large projects, typically 4-8 months. (3) Form-Based District (FBD) overlay — replaces base zoning with form-based standards, usually initiated by the Planning Commission for specific corridors. The real 'bonus' in St. Louis is the historic tax credit stack: 20% federal + 25% state = 45% of qualified rehab costs. This is the most powerful development incentive in the city and why so many projects are adaptive reuse rather than new construction.

Overlay Districts

Local Historic Districts

St. Louis has 18+ local historic districts including Lafayette Square (the city's first, 1972), Soulard, Benton Park, Tower Grove East, Shaw, Central West End, Compton Hill, Fox Park, Hyde Park, McKinley Heights, Skinker-DeBaliviere, and The Ville. Each has unique rehabilitation and design standards. Exterior alterations visible from the street require a permit from the Cultural Resources Office. New construction must match the district's character in scale, materials, and setback. Budget 1-2 extra months for historic review on any project in these districts.

National Register Historic Districts

Over 100 National Register districts blanket the city — far more than most cities this size. National Register listing alone doesn't restrict private development, but it unlocks the federal Historic Tax Credit (20%) and Missouri state Historic Tax Credit (25%). Combined 45% tax credits make historic rehab pencil in St. Louis when it wouldn't elsewhere. If your project involves a contributing structure in a National Register district, the tax credit math should be your first pro forma calculation.

Form-Based Zoning Districts (FBD)

Overlay districts that replace base letter-district rules with form-based standards. Each FBD is created by ordinance for a specific area. Active FBDs include portions of the Delmar Loop, Downtown West, and select corridors. FBDs typically allow higher density, require build-to lines, and regulate building form rather than use. Check if your site falls within an FBD before relying on base district standards.

Community Unit Plans (CUP)

Large-scale planned development overlays approved by ordinance. Major CUPs include Ballpark Village, City Foundry STL, NGA West, and Cortex Innovation District. If your site is within a CUP boundary, the CUP ordinance supersedes base zoning. Read the specific CUP ordinance — each one is custom.

FEMA Flood Overlay

Portions of St. Louis along the Mississippi River, River des Peres, and Gravois Creek are in FEMA flood zones. The riverfront industrial areas (K and J districts) south of the Poplar Street Bridge are particularly affected. Check FEMA FIRM panels before making an offer on any site east of I-55 or along the River des Peres channel. Flood zone designation affects buildable area, foundation requirements, insurance costs, and financing. The city's new floodplain management ordinance may impose additional restrictions beyond FEMA minimums.

Planned Industrial Expansion Authority (PIEA)

Not a zoning overlay, but a critical incentive layer. PIEA provides tax abatement (up to 25 years) for industrial and commercial projects. Combined with Chapter 99 (Land Clearance for Redevelopment Authority) and Chapter 353 tax abatement, St. Louis has some of the most aggressive tax incentive tools in the Midwest. Factor abatement into your hold-period pro forma — it can make marginal deals work.

Frequently Asked Questions

How do I check zoning for a specific property?

Use the city's Geo St. Louis interactive map at stlouis-mo.gov or the zoning map viewer. Enter an address to see the base district, any overlays (CUP, SUD, FBD), and historic district status. For what the zoning actually means for your site, that's what Nearby Property does — enter any address and get the full property profile with permitted uses, setbacks, density, and development potential.

Is St. Louis City the same as St. Louis County?

No. St. Louis City is an independent city — it separated from St. Louis County in 1877 and operates as its own jurisdiction with its own zoning code, building department, and tax structure. St. Louis County has 88 separate municipalities, each with their own zoning. If your site is outside city limits, you're in a completely different code. Always verify which jurisdiction you're in before starting any analysis.

What is the cumulative zoning system?

St. Louis uses cumulative zoning: uses permitted in district A are also permitted in B, C, D, and so on up the chain. So an E-district lot allows single-family homes (A), duplexes (B), townhouses (C), medium-density apartments (D), and high-rise apartments (E). The exception is K-district (Unrestricted), which prohibits all residential. This cumulative system means higher-letter districts are more flexible, not just more intense.

How do historic tax credits work in St. Louis?

If your property is a contributing structure in a National Register historic district, you can claim 20% federal + 25% Missouri state historic tax credits on qualified rehabilitation expenses. That's 45 cents back on every dollar of rehab cost. The credits must be allocated (state credits have an annual cap), and the rehab must follow the Secretary of the Interior's Standards. This is why St. Louis has more historic rehab projects per capita than almost any other US city — the math is compelling.

What is aldermanic courtesy and why does it matter for development?

Aldermanic courtesy is an unwritten rule: the full Board of Aldermen defers to the ward alderperson on zoning matters within their ward. In practice, this means your ward alderperson has veto power over rezonings, CUPs, SUDs, and any zoning-related legislation. Engage your alderperson early — before you file anything. If they oppose your project, the Board will not overrule them. This is the most important political dynamic in St. Louis development.

Can I convert an industrial building to apartments?

In J-district: only if 40% or more of the block frontage is already residential. In K-district: residential is prohibited entirely. For industrial-to-residential conversions, you typically need a rezoning (J to D or E) or a Special Use District (SUD) overlay. The good news: if the building is in a National Register district, the 45% combined historic tax credit makes warehouse-to-loft conversions extremely attractive financially. Many of St. Louis's most successful residential projects are J-district conversions in Washington Ave, Soulard, and Lafayette Square.

Does St. Louis have lot coverage limits?

No. Unlike most cities, St. Louis does not specify maximum lot coverage percentages in its zoning code. Instead, your buildable envelope is defined by setbacks (front, side, rear yards) and FAR (floor area ratio for commercial uses in D and above). This means on a lot with no required setbacks (F, G, H, I, K districts for commercial), you can theoretically cover 100% of the lot. The practical constraint is fire code, egress, and loading access requirements.

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