Gently rolling Blackland Prairie grassland with deep dark cracking clay soil in the foreground and post oak along a fence line.
Collin County 2021 IRC as adopted here

Barndominium Builders in Allen, TX

Allen is a comprehensively master-planned Collin County suburb, and that shapes what a barndominium buyer is actually up against here. The city runs its own adopted code, publishes a fully filled-in set of design criteria, and requires a Texas-registered engineer to design and seal every foundation. Its zoning tops out at a 40,000 square foot estate lot with a 30 percent coverage cap and a 2,400 square foot minimum dwelling, and the residential schedule carries a 100 percent masonry exterior line. But the constraint most likely to sink a build in Allen and across the DFW ring is not in any ordinance. It is the recorded deed restriction on the lot: Texas courts enforce covenants on minimum size, exterior materials and living in a shop, and the legislature has left all three alone.

Allen at a glance

County
Collin County
Population
113,447
Where we build
Allen, Plano, Frisco, McKinney

ZIPs 75002, 75013

Site visits
We meet you on the parcel, anywhere in Allen or Collin County
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Building conditions in Allen

What actually changes from one Texas jurisdiction to the next: who issues the permit, whether the residential code is enforced there at all, what the structure has to be engineered to, and what the ground is like. These are the numbers your drawings have to satisfy.

Build conditions for Allen , Collin County, Texas : design wind speed 115 mph. BUILD CONDITIONS ALLEN, TXCollin County2021 IRCDESIGN WIND SPEED115 mphUltimate design wind speed, 3-second gust (76 mph fastest mile), from Allen's own amended TableR301.2(1). Topographic effects, special wind region and windborne debris zone are all recorded as…ZONING · R-1 AND R-1.5 SINGLE-FAMILY RESIDENT…40,000 sq ft in R-1, 30,000 sq ft in…The estate districts also set a 2,400 sq ft minimum dwelling unitsize, a 150-foot minimum lot width, 30 percent maximum lot coverage…WHO ISSUES THE PERMITCity of Allen Building and Permittin…305 Century Parkway, Allen, TX 75013. Phone 214.509.4130,permits@allentx.gov. Monday to Friday, 8 a.m. to 5 p.m. All permit…
Build conditions for Allen, drawn from the sourced facts on this page. Every figure above is cited in the quick-facts panel below, with its source and vintage.
Adopted code
Allen adopted the 2021 International Residential Code and 2021 International Energy Conservation Code by Ordinance No. 3919-6-22, adopted 14 June 2022 and effective 1 July 2022. The city states it has adopted the 2024 International Codes effective 26 September 2026.

City of Allen Land Development Code, Art. III, Sec. 3.01(1) and the editor's note to Art. III; City of Allen Building and Permitting Division page

Design wind speed
115 mph ultimate design wind speed (3-second gust), 76 mph fastest mile, with ground snow load 5 lb/ft2 and Seismic Design Category A — published by Allen in its own amended Table R301.2(1).

City of Allen Land Development Code, Sec. 3.05(11), amending Table R301.2(1) of the 2021 IRC

Frost depth and termites
Allen publishes a 6-inch frost line depth, a winter design temperature of 22°F, an air freezing index of 150, and a termite infestation probability of 'Very Heavy' — the rating that governs foam plastic use below grade at the foundation.

City of Allen Land Development Code, Sec. 3.05(11), amended Table R301.2(1)

An engineer on every foundation
Allen amends IRC Section R401.2 to read: 'Every foundation and/or footing, or any size addition to an existing post-tension foundation, regulated by this code shall be designed and sealed by a Texas-registered engineer.' It applies regardless of soil type.

City of Allen Land Development Code, Sec. 3.05(19)

Masonry in the zoning ordinance
Allen's schedule of residential height and area regulations carries a 'Building Materials — 100% Masonry Exterior' line, defined as: 'The exterior walls of all buildings, exclusive of doors and windows, shall be constructed of 100 percent brick, stone masonry, or stucco materials per elevation. For the purposes of this section, cementitious fiber board shall not be considered a masonry material.'

City of Allen Land Development Code, Sec. 4.15.2, Schedule of Residential Height and Area Regulations, and its footnote

The three covenants with no statutory protection
Texas has legislated against restrictive covenants that block solar devices, certain shingles, flags, standby generators, firearms, religious items, pool enclosures and security measures. It has passed nothing on exterior materials, minimum square footage or living in an accessory building — the exact three restrictions that stop a barndominium.

Texas Property Code Chapter 202, section headings 202.007 to 202.024

Also worth knowing before you build in Allen

What the Supreme Court of Texas quoted
In Tarr v. Timberwood Park Owners Association (2018) the Supreme Court of Texas reproduced a subdivision covenant requiring a residence of 'not less than 1,750 square feet, exclusive of open porches, breezeways, carports and garages', 'having not less than 75% of its exterior ground floor walls constructed of masonry', and providing that 'no structures or house trailers of any kind may be moved on to the property'. The case itself was decided on short-term rentals, not on materials.

Tarr v. Timberwood Park Owners Association, Inc., No. 16-1005, Supreme Court of Texas, 25 May 2018

Living in the shop, enjoined
A 1953 Travis County deed restriction reading 'No garage or garage apartment or other facilities shall be used for residence purposes until the principal dwelling house is erected' — together with a 900 square foot minimum and a requirement that the house 'be of frame or better construction' — was enforced by permanent injunction, affirmed on appeal in August 2026. The 2022 purchaser had taken title subject to 'all presently recorded and validly existing restrictions'.

Cliffhanger Developments, LLC v. Lubitz, No. 03-24-00555-CV, Texas Court of Appeals, Third District at Austin, 14 August 2026

Covenants can change after you buy
In a rural subdivision case from Parker County, a covenant barring 'drilling ... for minerals of any kind' was amended by the developer after the lots were sold to add the words 'or water', and the court held the amendment effective as a matter of law because the original covenants reserved the right to amend and set out the method.

Dyegard Land Partnership v. Hoover, No. 2-99-361-CV, Texas Court of Appeals, Second District at Fort Worth, 11 January 2001

Where the restrictions are written down
Dedicatory instruments must be filed in the real property records of the county where the land sits, and have no effect until they are. For land in Allen that is the Collin County Clerk. The state-promulgated title commitment then lists them: Texas Department of Insurance Form T-7 reads 'SCHEDULE B — EXCEPTIONS FROM COVERAGE ... 1. The following restrictive covenants of record itemized below'.

Texas Property Code Sec. 202.006; Texas Department of Insurance promulgated Form T-7, Commitment for Title Insurance, Schedule B

The 40-lot trap
The architectural-review protections in the Texas Residential Property Owners Protection Act — the written denial, the reasons in detail, the right to a hearing — apply only to an association of more than 40 lots, and do not apply at all during the development period while the declarant controls the review authority. A small subdivision falls outside them entirely, leaving only the statutory presumption that the committee's decision was reasonable.

Texas Property Code Sec. 209.00505(b) and Sec. 209.003; Sec. 202.004(a)

No HOA is not no restrictions
Chapter 209 reaches only subdivisions where an association collects assessments with mandatory membership. Chapter 202 reaches every restrictive covenant 'regardless of the date on which they were created', and a covenant recorded by a developer decades ago binds the land with no association in existence. Restrictive covenants are also to be 'liberally construed to give effect to their purposes and intent', and a court may assess civil damages up to $200 for each day of violation.

Texas Property Code Sec. 202.002(a), Sec. 202.003(a), Sec. 202.004(c) and Sec. 209.003

What the legislature took from cities
Texas Government Code Sec. 3000.002 bars a governmental entity from adopting or enforcing a regulation that limits a building product or material approved by a national model code, or that sets a materials or aesthetic standard more stringent than that code, and Sec. 3000.002(e) provides that a conflicting regulation 'is void'. Sec. 3000.004 expressly leaves untouched the enforcement of land use restrictions contained in plats and other recorded instruments.

Texas Government Code Sec. 3000.001 to 3000.004, added by Acts 2019, 86th Leg., Ch. 1289 (H.B. 2439)

Lot sizes and minimum house size
Allen's largest residential lot standard is 40,000 sq ft in R-1 and 30,000 sq ft in R-1.5, both with a 2,400 sq ft minimum dwelling unit size, 30 percent maximum lot coverage and a 35-foot height cap. The smallest, R-7, is a 5,000 sq ft lot with a 1,000 sq ft minimum dwelling.

City of Allen Land Development Code, Sec. 4.15.2

Accessory and shop buildings
A building permit is required for any accessory structure over 120 square feet, and for one of any size that the adopted codes require to be built on a permanent or engineered foundation. An accessory structure over 400 square feet must meet the main house's side and rear setbacks, it may never be taller than the main house, and its area counts against the district's lot coverage cap.

City of Allen Land Development Code, Sec. 4.10(2)

Contractor registration
All contractors are required to register with the City of Allen for $50 annually, submitted through the Citizen Self-Service portal. There is no Texas state licence for a residential building contractor; Allen's registration is a city requirement, and separately the city registers state-licensed plumbers, electricians, HVAC and irrigation contractors.

City of Allen Contractor Registration page; Land Development Code Sec. 3.12; Code of Ordinances Secs. 4-7 to 4-9

One climate zone, either edition
Allen lies wholly in Collin County, which sits in climate zone 3A on both the pre-2021 and the 2021 IRC maps. Unlike Dallas, Fort Worth, Garland, Carrollton and Richardson, whose zone changed between editions, Allen's insulation zone does not depend on which edition is in force.

IRC climate zone assignments by county for the 2018 and 2024 editions, cross-checked against the DOE/PNNL climate zone dataset

An excavator grading a compacted building pad on a cleared lot, with survey stakes and a drainage swale visible.
Below the slab

The expensive surprises are in the ground, not the building

What moves a Texas budget is usually below grade, and it is soil rather than rock: shrink-swell clay. The Blackland Prairie and the Gulf Coast clays move enough between a wet season and a dry one to drive the foundation design across the state's largest markets, which is why several DFW cities require an engineer's seal on the foundation of every new house. Those are the same conditions that decide whether a septic field passes its soil and site evaluation, so the grading plan, the foundation and the drainfield get resolved together rather than one at a time. We price the dirt before we price the building.

What we build in Allen

All nine of our services — kits, custom plans, post-frame and steel construction, site preparation, permitting and engineering, through to turnkey builds — are available across Collin County. What a project costs depends far more on the parcel than on square footage, so we work from your land rather than from a rate card.

See what we build

What a build looks like

Three stages every Allen project passes through, from a raw parcel to a finished home. Site work first, because that is where the budget is decided.

Aerial view of an undeveloped rural lot with cleared grass, a live oak and cedar elm treeline, and a pale gravel access track.
Stage one

The parcel

Zoning, setbacks, flood zone and utility access get checked before anything is drawn.

An excavator grading a compacted building pad on a cleared lot, with survey stakes and a drainage swale visible.
Stage two

Pad and permit

Clearing, grading and a compacted pad, while the submittal works through Collin County.

A finished barndominium at dusk with warm interior lighting glowing through its large windows.
Stage three

Frame to finish

Shell erected and dried in, then systems, insulation and interior finish through to CO.

Those are the rules for Collin County. Tell us what you want to build and we will draw it to them.

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Where we build around Allen

Collin County and the rural land around it. The buildable acreage for a project this size usually sits outside the city limits, which is frequently what changes who issues your permit.

Our Allen service area, covering Collin County and the surrounding rural acreage. This map marks the territory we serve, not a branch location.

Keep reading

The questions that usually come next once you know what Allen allows.

Barndominium Cost Guide

Sourced per-square-foot ranges by tier and by size, with a calculator built on the same figures.

Read it

Is It Legal in Texas?

Classification, zoning, the HOA gate, and why "nonresidential farm building" does not cover a home.

Read it

How Long Does It Take?

Census build-duration data, and what actually sets the permit clock where you are building.

Read it

Nearby areas we build in

Others we cover in this part of Texas. The permitting authority, the adopted design criteria and the zoning can all differ from one to the next.

Plano

Collin County
McKinney

Collin County
Frisco

Collin County

Building in Allen: common questions

8 questions we get asked most often about building in Allen. If yours is not on the list, ask it directly.

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Can I actually build a barndominium in Allen?
Honestly: Allen is not where the acreage is. It is a comprehensively master-planned suburb, and its own zoning tops out at a 40,000 square foot estate lot — just under an acre — with a 30 percent lot coverage cap and a 2,400 square foot minimum dwelling. Its A-O agricultural-open space district is described in the code as the proper classification for undeveloped or newly annexed land, which is a holding classification rather than a supply of buildable tracts. If what you want is a shop-and-house on real acreage, look north into Grayson County or east into Hunt County, where land is still being subdivided and a Texas county has no general building-code authority in its unincorporated area at all. What this page is for is the rules that follow you: Allen's own code, and the deed restrictions that reach far beyond the city limits.
Which building code does Allen build to?
Allen adopted the 2021 International Residential Code and 2021 International Energy Conservation Code by Ordinance No. 3919-6-22, adopted 14 June 2022 and effective 1 July 2022, together with the 2021 IBC, IEBC, IFC, IMC, IFGC, IPC and ISPSC. The city has since stated that it adopted the 2024 International Codes with an effective date of 26 September 2026. There is no statewide answer to this question in Texas — each city adopts its own edition and may amend it, including by deleting requirements, so the adopting ordinance is the only reliable source. Allen has amended the 2021 IRC in several places: it deletes Section R313.2, the one- and two-family sprinkler requirement, and deletes Section R322 on flood-resistant construction.
Does Allen really require an engineer for the foundation?
Yes, and it is broader than most people expect. Allen amends IRC Section R401.2 to add: 'Every foundation and/or footing, or any size addition to an existing post-tension foundation, regulated by this code shall be designed and sealed by a Texas-registered engineer.' That is not limited to expansive soil — it applies to every foundation. It matters here because Collin County sits on Blackland Prairie clay, where Texas law independently removes the exemption that would otherwise let a slab for a private dwelling be designed without an engineer, and the IRC hands expansive-soil foundations to the engineering provisions of the building code anyway. Two separate routes reach the same place, and Allen's ordinance closes the gap between them.
Allen's zoning says 100 percent masonry. Does that rule out a metal-clad barndominium?
Allen's schedule of residential height and area regulations does carry a 'Building Materials — 100% Masonry Exterior' line, defined as brick, stone masonry or stucco per elevation, with cementitious fiber board expressly excluded. Set against it, Texas Government Code Section 3000.002 bars a governmental entity from adopting or enforcing a regulation that limits a building product approved by a national model code, or that sets a materials or aesthetic standard more stringent than that code, and Section 3000.002(e) says a conflicting regulation 'is void'. Whether a particular ordinance falls on the wrong side of that line is a question for a lawyer and for the current model code, not something to assume. What is not in doubt is the other half: Section 3000.004 leaves the enforcement of recorded land use restrictions completely untouched. Talk to Allen's building official about the ordinance, and read your deed restrictions about the covenant.
How do I find out whether deed restrictions stop a barndominium on a piece of land?
Two documents, both ordinary parts of a Texas closing. First, the county clerk's real property records — for land in Allen, the Collin County Clerk. Texas law requires dedicatory instruments to be filed in the real property records of the county where the land is, and provides that an instrument has no effect until it is filed, so what binds your land is public and findable. Second, and more practical: the title commitment you receive before closing. The Texas Department of Insurance promulgates the form, so it looks the same at every Texas title company, and it reads 'SCHEDULE B — EXCEPTIONS FROM COVERAGE ... 1. The following restrictive covenants of record itemized below'. Schedule B, item 1 is where the restrictions on your parcel are listed by recording data. Read it before you sign, not after.
The listing says no HOA. Does that mean no restrictions?
No, and this is the single most expensive assumption a barndominium buyer makes. Texas has two separate bodies of law here. The Residential Property Owners Protection Act reaches only subdivisions where an association collects assessments with mandatory membership — and even there, its architectural-review protections apply only to associations of more than 40 lots and not at all during the development period while the developer still controls the review committee. A small subdivision falls outside those protections entirely. Meanwhile Chapter 202 of the Property Code reaches all restrictive covenants regardless of when they were created. A declaration a developer recorded decades ago binds the land with no association in existence, and any benefited lot owner can sue on it. Two of the leading Texas cases on this were neighbour-against-owner and developer-against-owner, not association enforcement.
Can I live in the shop while the house goes up?
The city's code and the covenant on your lot are two different questions, and the covenant is usually the harder one. A Texas appellate court affirmed a permanent injunction in August 2026 enforcing a 1953 recorded restriction reading 'No garage or garage apartment or other facilities shall be used for residence purposes until the principal dwelling house is erected'. The same instrument set a 900 square foot minimum and required the house to be 'of frame or better construction'. The purchaser had bought in 2022 and took title subject to all presently recorded and validly existing restrictions. The legislature has carved out solar panels, certain shingles, flags, generators and pool enclosures from covenant enforcement — and has left materials, minimum size and use restrictions entirely alone. Find out what your instrument says before you plan a build sequence around living on site.
What design figures does Allen actually publish?
Allen fills in its climatic and geographic design criteria table rather than leaving it blank, which not every Texas city does. Its published values are a 115 mph ultimate design wind speed (3-second gust) or 76 mph fastest mile, a 5 lb/ft2 ground snow load, Seismic Design Category A, moderate weathering, a 6-inch frost line depth, a termite infestation probability of 'Very Heavy', a 22°F winter design temperature, an air freezing index of 150 and a mean annual temperature of 64.9°F. Topographic effects, special wind region and windborne debris zone are all 'No'. The 'Very Heavy' termite rating is the one to watch on a slab-on-grade building, because it governs whether foam plastic may be used below grade at the foundation.

Building in Allen?

Start with the plan. Tell us what you want to build and we will draw it, then confirm what Collin County will actually let you put on the parcel and what wind load it has to meet. That conversation costs nothing.

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