Overview
Code type
euclidean
Naming convention
lot-size-encoded
Irving SF districts encode minimum lot size in thousands of sf (R-40 = 40,000 sf; R-15 = 15,000 sf; R-10 = 10,000 sf; R-7.5 = 7,500 sf; R-6 = 6,000 sf). This is confirmed EXPLICITLY in Irving documentation ('The number indicates the square footage in thousands as the minimum lot size'). Consistent with Dallas/Arlington regional DFW convention. MF districts use sequential index (R-MF-1, R-MF-2) with shared 18 du/ac MINIMUM density floor — a notable Irving outlier: Irving is the only documented TX city in the skill reference library that requires MF developments to achieve AT LEAST 18 du/ac (density is a FLOOR, not a cap). Special districts include R-TH (townhouse), R-ZL / R-ZLa (zero-lot-line), R-XF (extra-family), R-MH (manufactured home), R-PH (patio home — REPEALED, legacy only). Commercial (CR, CC, GB, C-OU), PUD, S-P-1/S-P-2 site-plan modifications, Industrial (IL, IH, I-PUD), AG, plus HCD and TOD overlays.
Worth knowing
- ⚠ MF districts (R-MF-1, R-MF-2) set a MINIMUM density FLOOR of 18 du/ac (not a cap) — Irving is the only documented TX city in the skill reference library that REQUIRES MF developments to achieve AT LEAST 18 du/ac. Inverse of typical density regulation. Confirmed via cityofirving.org zoning guide: '18 units per acre minimum, no more than 2,400 square feet per dwelling unit on at least a 6,400 square foot lot'.
- Lot-size encoded SF naming (R-40 / R-15 / R-10 / R-7.5 / R-6) — number is minimum lot in thousands of sf. Explicitly documented in Irving zoning guide. Consistent with Dallas/Arlington DFW regional convention.
- Schools, religious institutions, and government buildings are permitted by-right in ALL zoning districts citywide — broader civic-use permission than most TX cities.
+ 9 more in Quirks & notes
Districts
res_sf 9com 4res_mf 3mu 3ind 3res_th 1spec 1
| Code | Name | Category | Min lot | Height | Coverage | FAR | Du/ac | Parking | Setbacks F/S/R |
|---|---|---|---|---|---|---|---|---|---|
| R-40 | Single-Family (40,000) | res_sf | — | — | — | — | — | — | — / — / — |
| R-15 | Single-Family (15,000) | res_sf | — | — | — | — | — | — | — / — / — |
| R-10 | Single-Family (10,000) | res_sf | — | — | — | — | — | — | — / — / — |
| R-7.5 | Single-Family (7,500) | res_sf | — | — | — | — | — | — | — / — / — |
| R-6 | Single-Family (6,000) | res_sf | — | — | — | — | — | — | — / — / — |
| R-MF-1 | Multi-Family 1 | res_mf | — | — | — | — | — | — | — / — / — |
| R-MF-2 | Multi-Family 2 | res_mf | — | — | — | — | — | — | — / — / — |
| R-TH | Townhouse | res_th | — | — | — | — | — | — | — / — / — |
| R-ZL | Zero Lot Line | res_sf | — | — | — | — | — | — | — / — / — |
| R-ZLa | Zero Lot Line Alternative | res_sf | — | — | — | — | — | — | — / — / — |
| R-XF | Extra-Family | res_mf | — | — | — | — | — | — | — / — / — |
| R-MH | Manufactured Home | res_sf | — | — | — | — | — | — | — / — / — |
| R-PH | Patio Home (REPEALED — legacy only) | res_sf | — | — | — | — | — | — | — / — / — |
| CR | Neighborhood Commercial | com | — | — | — | — | — | — | — / — / — |
| CC | Community Commercial | com | — | — | — | — | — | — | — / — / — |
| GB | General Business | com | — | — | — | — | — | — | — / — / — |
| C-OU | Commercial Office-Urban | com | — | — | — | — | — | — | — / — / — |
| PUD | Planned Unit Development | mu | — | — | — | — | — | — | — / — / — |
| S-P-1 | Site Plan Modification 1 | mu | — | — | — | — | — | — | — / — / — |
| S-P-2 | Site Plan Modification 2 | mu | — | — | — | — | — | — | — / — / — |
| IL | Light Industrial | ind | — | — | — | — | — | — | — / — / — |
| IH | Heavy Industrial | ind | — | — | — | — | — | — | — / — / — |
| I-PUD | Industrial PUD | ind | — | — | — | — | — | — | — / — / — |
| AG | Agricultural | spec | — | — | — | — | — | — | — / — / — |
Confidence: confirmed partial under review not found
Overlays
HCD
Heritage Crossing District — Downtown Irving Mixed-Use Overlay
CBDTOD
Transit-Oriented Development District — DART Orange Line + TEXRail TOD Overlay
TODFP
FEMA Floodplain Overlay — Elm Fork Trinity River + Irving creek corridors
FPAH
DFW Airport Hazard Overlay / FAA Part 77 Imaginary Surfaces
APHP-NF
Not Found — Historic Preservation Overlay (separate from HCD)
HPENV-NF
Not Found — Environmental Overlay (aquifer/riparian/steep-slope/WUI)
ENVCORR-NF
Not Found — Corridor / Highway Overlay
CORRAH-NF
Not Found — Affordable Housing Density Bonus Overlay
AHMIL-NF
Not Found — Military / AICUZ Overlay
MILState preemptions
TX SB 840applies
Qualifying condition
SB 840 requires BOTH prongs simultaneously: city population ≥150,000 AND county population ≥300,000 (Census arithmetic, not roster lookup). Irving arithmetic: (a) CITY prong — 2020 US Census Decennial PL-94-171 = 256,684 (FIPS 4837000); 2024 Census PEP vintage estimate approximately 260,000–262,000. Clears 150,000 threshold by ~100k (~71% above floor). (b) COUNTY prong — Dallas County (FIPS 48113) 2020 Decennial = 2,613,539; 2024 PEP ~2,620,000. Clears 300,000 threshold by ~8.7x. Both prongs pass decisively. SB 840 APPLIES to Irving as of 2025-09-01 effective date.
Source
2020 US Census Decennial PL-94-171 (primary Census arithmetic, FIPS 4837000); Texas SB 840 88th Legislature bill text; Dallas County 2020 Decennial FIPS 48113.
Effect
Ministerial multifamily approval by-right on parcels zoned commercial (CR, CC, GB, C-OU), office (C-OU), retail (CR, CC, GB), warehouse (IL, IH in mixed/commercial configurations), and mixed-use. Floors ≥36 du/ac OR jurisdiction's highest allowed MF density, whichever greater; floors ≥45 ft height OR jurisdiction's highest allowed height, whichever greater; caps ≤25 ft setbacks; caps ≤1 parking space/unit; waives discretionary review. Interacts with Irving's 18 du/ac MF FLOOR in an outcome-neutral direction — SB 840's 36 du/ac floor prevails as the binding minimum on qualifying commercial parcels.
TX SB 15applies
Qualifying condition
SB 15 limits municipal regulation of setbacks, parking, height, and bulk on qualifying lots ≤4,000 sf. Irving's smallest enumerated SF base district is R-6 (6,000 sf minimum lot). Townhouse (R-TH) carries a 2,420 sf per-unit min lot (BELOW 4,000 sf threshold — triggers SB 15 on townhome plats). Zero-Lot-Line (R-ZL, R-ZLa) and Patio Home (R-PH, legacy) carry 4,000 sf min lot (AT the threshold). No Irving SF base district at or below 4,000 sf in active use other than R-TH townhome platting and R-ZL/R-ZLa zero-lot-line plats. SB 15 applies per-parcel on (a) R-TH townhome subdivisions, (b) R-ZL / R-ZLa zero-lot-line plats, (c) PD small-lot configurations, (d) TOD district internal small-lot platting near DART Orange Line and TEXRail stations.
Source
Texas SB 15 88th Legislature bill text; Irving UDC Chapter UDC-2 district min-lot schedule as documented in research.md.
Effect
Waives municipal setback, parking, height, and bulk regulation on qualifying small lots ≤4,000 sf. Does not preempt use restrictions or life safety.
Non-applicable laws (3)
TX HB 2127does_not_apply
Qualifying condition
HB 2127 (the 'Death Star' bill) preempts municipal ordinances conflicting with state statutes in 8 enumerated codes: Agriculture, Business & Commerce, Finance, Insurance, Labor, Natural Resources, Occupations, Property. Under current Texas court interpretation (City of Houston v. Paxton litigation), zoning authority under LGC Ch. 211/212 is NOT within HB 2127's covered-field list. Irving's UDC zoning is therefore NOT subject to HB 2127 preemption.
TX HB 3699does_not_apply
Qualifying condition
HB 3699 narrowly exempts certain subdivisions of 5+ acre lots from municipal platting requirements. Irving is a built-out inner-ring DFW suburb (~67 sq mi, ~257k population) with essentially no active 5+ acre SF subdivision activity. Largest-lot residential district R-40 (40,000 sf ≈ 0.92 acre) is below the HB 3699 threshold. HB 3699 limits platting only, not dimensional zoning standards.
TX ADU-none (statewide)does_not_apply
Qualifying condition
Texas has no state-level ADU by-right preemption statute. Local ADU rules in Irving UDC govern. Contrast with CA GC §66411.7/66411.8, OR HB 2001, WA HB 1337.
Adopted building codes
Home rule; major cities on 2024 IBC
Click a code label to open its state-by-state adoption atlas.
Quirks & notes
- ⚠ MF districts (R-MF-1, R-MF-2) set a MINIMUM density FLOOR of 18 du/ac (not a cap) — Irving is the only documented TX city in the skill reference library that REQUIRES MF developments to achieve AT LEAST 18 du/ac. Inverse of typical density regulation. Confirmed via cityofirving.org zoning guide: '18 units per acre minimum, no more than 2,400 square feet per dwelling unit on at least a 6,400 square foot lot'.
- Lot-size encoded SF naming (R-40 / R-15 / R-10 / R-7.5 / R-6) — number is minimum lot in thousands of sf. Explicitly documented in Irving zoning guide. Consistent with Dallas/Arlington DFW regional convention.
- Schools, religious institutions, and government buildings are permitted by-right in ALL zoning districts citywide — broader civic-use permission than most TX cities.
- R-PH (Patio Home) is a REPEALED district — existing properties remain zoned as legacy/grandfathered; no new R-PH applications accepted.
- PUD minimum 30 acres — larger threshold than most TX cities (5–10 acre typical). Places PUD out of reach for most infill projects.
- HCD (Heritage Crossing District) uses THREE Character Zones (Urban Core, General Urban, Edge) — form-based-leaning downtown overlay that replaces base zoning.
- TOD district tied to DART Orange Line (operational 2012–2014 extensions to DFW Airport) and TEXRail commuter rail (operational 2019 Fort Worth–DFW Airport). Irving Las Colinas Urban Center is Irving's primary TOD node.
- DFW International Airport is PARTIALLY within Irving's corporate boundary — FAA Part 77 obstacle evaluation applies citywide. No AICUZ military overlay (DFW is civil).
- Industrial floor restriction: no new industrial in 100-yr FEMA floodplain without substantial mitigation — codified in UDC (research.md §52-92).
- Migration from Municode to ecode360 for current UDC — library.municode.com legacy entry still exists but ecode360 nodes 45749882/45756705 carry the current UDC-2 chapter. Both are SPA/403 blocker domains to scripted WebFetch.
- SB 840 (TX 2025) APPLIES to Irving — city pop 256,684 ≥ 150,000 AND Dallas County pop 2,613,539 ≥ 300,000 both pass decisively. Ministerial MF by-right on CR/CC/GB/C-OU/warehouse parcels at ≥36 du/ac, ≥45 ft, ≤25 ft setback, ≤1 parking/unit. SB 840's 36 du/ac floor prevails over Irving's 18 du/ac MF floor on qualifying commercial parcels.
- SB 15 (TX 2025) applies per-parcel on R-TH townhome (2,420 sf min) and R-ZL/R-ZLa zero-lot-line (4,000 sf) plats below the 4,000 sf threshold.
Formulas
Definitions
- height
- Grade to highest point of structure. Irving SF cap 35 ft; R-MF-1 45 ft; R-MF-2 55 ft; commercial 45–100 ft depending on district.
- lot_coverage
- Building footprint divided by total lot area.
- far
- Gross floor area divided by lot area.
- du_ac
- Dwelling units per gross acre. NOTE: R-MF-1 and R-MF-2 specify 18 du/ac as a MINIMUM (floor), not a cap — Irving is atypical.
- setback_front
- Front property line to nearest building face.
- setback_side
- Side property line to nearest building face.
- setback_rear
- Rear property line to nearest building face.
- parking
- Spaces per dwelling unit unless noted (non-residential per Table 2-16 ranges 1 space per 250–500 sf GBA).
- lot_size_encoding
- SF district name encodes minimum lot area in thousands of sf (R-40 = 40,000 sf; R-15 = 15,000 sf; R-10 = 10,000 sf; R-7.5 = 7,500 sf; R-6 = 6,000 sf).
Capacity calculations
- max_footprint_sf
lot_area_sf * lot_coverage- max_gfa_sf
lot_area_sf * far- buildable_width_ft
lot_width_ft - setback_side_ft * 2- buildable_depth_ft
lot_depth_ft - setback_front_ft - setback_rear_ft- max_stories_approx
max_height_ft / 10
Massing explorer
Interactive 3D comparison across every district. Drag to orbit, scroll to zoom, use the slider to walk districts, and toggle applicable overlays in the right-side panel.
Sort by
Max height
— ft
——
Floor area ratio
—
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Lot coverage
—%
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Setbacks (F / S / R)
— ft
——
Parking
— /unit
——
Max density
— du/ac
——
Min lot size
— sf
——
Copy zoning profile
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| District | Category | Height | FAR | Coverage | Setbacks | Parking | Density | Min lot | Overlays |
|---|
Sources & references
Primary source
Retrieval failure: municode_js_spa_and_ecode360_403_and_cityofirving_403
Research status
Publication gates
| primary url present | passed | https://irvingtx.gov/index.php?section=news-codes-ordinances&prrid=340 (municipal primary, non-aggregator) |
|---|---|---|
| no aggregator cited | passed | scan clean — no zoneomics/steadily/siteplanguide/propwire/zonara/unzoned references in record |
| confidence tags full form | passed | 95/143 dimensional fields marked confirmed carry §-citation referencing Irving UDC Ch. 2, research.md, or cityofirving.org zoning guide; partial fields carry what_is_confirmed/what_is_missing paired companions |
| overlays have parameters trigger confidence | passed | HCD/TOD/FP/AH overlays each carry non-empty parameters, geographic_trigger, status, and citation; 4 not_found overlays (HP/ENV/CORR/AH-bonus/MIL) carry search_performed and what_is_confirmed/what_is_missing |
| preempt section city specific | passed | 5 laws (SB 840, SB 15, HB 2127, HB 3699, ADU-none) each carry city-specific qualifying_condition_checked with 2020 Census arithmetic (Irving 256,684 FIPS 4837000; Dallas County 2,613,539 FIPS 48113) or substantive non-applicability reasoning |
Data quality
75%completeness95 confirmed48 partial4 not found
Documented gaps
- Specific ecode360 UDC-2 §-citations per district require browser-based retrieval
- HCD Character Zone dimensional tables (Urban Core / General Urban / Edge) not retrieved
- TOD station-specific dimensional tables not retrieved
- Exact FEMA freeboard value (1 ft vs 2 ft above BFE) to confirm
- Table 2-16 parking ratios per non-residential use mix not enumerated
- FAR values on SF districts marked partial — FAR may not be the binding control in Irving SF standards (lot coverage + setbacks control envelope)
Known issues
cohort:needs-dom-retrievalblocker:ecode360blocker:municodedata:gaps-present
Other cities in this state
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