Architect in Houston: 2026 Fees, Sealed Plans, Floodplain Heights and Garage Apartment Rules

What architects charge in Houston

Our figures start from national fee and construction data and apply the Texas cost factor of 0.82 from the U.S. Army Corps of Engineers Area Cost Factors. Design fees and building costs are listed separately, since you pay for the drawings long before a builder breaks ground.

Estimates for 2026, including labor and standard parts. Houston prices use the Texas statewide construction cost factor of 0.82 (US average = 1.00) from the U.S. Army Corps of Engineers Area Cost Factors, which have no separate Houston entry. Your quote depends on access, materials and the condition of the home.

The cost estimator estimates the design fee and the weeks to a permit for your project type and ZIP code. A longer version is on the architecture cost estimator page.

How Houston architects set the fee

HomeGuide's national survey finds residential architects charging 5% to 20% of the construction cost, $2 to $15 per square foot, or $100 to $250 an hour, with firm principals at up to $350 (HomeGuide). At the Texas cost factor, the hourly range comes to about $80 to $205, and about $285 for a principal. A permit set on its own runs $2,000 to $20,000 nationally, roughly $1,650 to $16,400 here, and full service through construction $15,000 to $80,000 or more.

Contracts usually pay the fee out by phase. The construction documents that the City reviews and builders price take the biggest share, about 40%. Schematic design takes about 20%, design development 10%, bidding 5% and construction administration 25%. You can also hire an architect only through the permit set and manage construction yourself. Our guide to permit drawings explains what that set must contain.

A Houston fee climbs with:

• A lot in the 100-year or 500-year floodplain, which adds an elevation certificate and an engineer-sealed mitigation plan
• A house in one of the City's 23 historic districts, where the design needs a Certificate of Appropriateness first
• Deed restrictions that set building lines or rule out a garage apartment
• A lot in the coastal windstorm area, where insurance through TWIA depends on a windstorm certificate

Do you need an architect in Texas?

For a house, state law says no. Section 1051.606 of the Occupations Code exempts anyone who prepares plans for, or supervises the construction, enlargement or alteration of, a privately owned single-family or two-family home (Occupations Code 1051.606). Alterations to other buildings are exempt too, unless they involve a substantial structural or exitway change. The law does protect the title: nobody without a license may call themselves an architect.

Drafters make up a large share of Houston's design workforce. The Bureau of Labor Statistics counted about 4,800 architectural and civil drafters working in the Houston metro in May 2023, about twice the national concentration, alongside about 2,000 architects (BLS).

What the City asks for

The City's prerequisite checklist for new single-family plans, revised in August 2026, sets out what a complete set includes (CE-1301). Plans must be ready for construction and cannot be marked "Preliminary" or "Not for Construction." The checklist lists structural and architectural sheets sealed, signed and dated by a Texas licensed architect or engineer, "in conformance with the Texas Architectural and Engineering Practices Act." On a floodplain lot, it also wants a mitigation plan sealed by a Texas professional engineer and an elevation certificate based on sealed drawings.

For elevated foundations, the City and Harris County offer a way around one seal. They publish standard details for elevated home foundations, and an applicant can use them, except the helical pier details, instead of hiring an engineer to design the elevated foundation (Houston Permitting Center). Since the seal requirements depend on the project, ask the City's residential plan review team (832-394-8820) which sheets your house needs sealed before you choose between an architect, an engineer and a designer.

Building without zoning: what controls a Houston lot

Houston has no zoning, but a lot still comes with rules. Planning reviews new homes and additions for Chapter 42 setbacks, Chapter 26 parking and Chapter 33 trees (Residential Permitting 101). Building lines can come from the survey, the deed restrictions, the plat, an ordinance or a Special Minimum Building Line, and the most restrictive one applies.

Deed restrictions

Deed restrictions are private agreements recorded with the county clerk. Most last 25 to 30 years, many renew on their own, and the City helps enforce them (City of Houston). The new-home checklist requires a deed restrictions declaration signed by the owner and checked against county appraisal records, and a City permit does not authorize building in violation of deed restrictions. Have your architect read the restrictions before the first sketch. Copies come from the county clerk.

Livable Places: garage apartments and small lots

In September 2023, City Council passed the Livable Places changes to Chapters 42 and 26, which took effect inside city limits on November 27, 2023 (City of Houston):

• A second dwelling unit, such as a garage apartment, can now be up to 1,500 square feet instead of 900.
• Parking follows unit size. The City's checklist asks for no space for an ADU of 1,000 square feet or less and one space for one of 1,001 to 1,500 square feet, plus generally two for the main house.
• Courtyard-style lots can be arranged around a shared courtyard without street frontage.
• Narrow-lot rules favor rear garages and front doors and windows facing the street.
• Small buildings of three to eight apartments are allowed again, with a height limit.

The changes do not override active deed restrictions, so a subdivision's covenants can still block a garage apartment the City would allow. At Houston prices, a 600 square foot detached unit costs roughly $73,800 to $123,000 to build and one above a garage $98,400 to $246,000, using HomeGuide's ADU figures. Our ADU design guide covers layouts.

Designing for Houston's floodplain

Hurricane Harvey flooded an estimated 154,170 homes in Harris County. In 2018 the City rewrote Chapter 19: new buildings and substantial improvements in the 500-year floodplain must be built 2 feet above the 500-year flood elevation, where the old standard had been 1 foot above the 100-year level, and the zero net fill rule now reaches the 500-year floodplain (Houston Public Media).

The required floor height drives the rest of the design. Mechanical, electrical and plumbing equipment must sit 2 feet above the 500-year flood elevation, flood vents go below the base flood elevation, and signed and sealed elevation certificates are due at plan submittal, before framing and before final inspection.

The rule reaches remodels and additions too. In zones A, AO and AE, work costing 50% or more of the structure's market value brings the entire house into compliance. Our Houston remodeling guide walks through that test.

In unincorporated Harris County, around Cypress for example, building in the 100-year floodplain or floodway requires foundation drawings by a Texas-registered architect or engineer, and no fill is allowed in a floodway (Harris County Engineering).

Do you need a permit?

Yes, for a new home, an addition or a garage apartment. Besides sealed sheets, the City's new-home checklist asks for a wastewater capacity reservation letter, a stormwater form, a grading worksheet and energy code documents from IC3, REScheck or REM/Rate that match the plans. Homes of three stories or less are drawn to the 2021 International Residential Code with local amendments, while a four-story house falls under the 2021 International Building Code and needs an NFPA 13R sprinkler system. If the new house will sit less than 3 feet from the property line of a neighboring home, the City wants an access agreement.

For additions, the City lists 10 business days of processing, plan review, a Texas registered survey or complete site plan, and foundation plans, noting that engineer-designed plans may be required for slabs (Residential Addition Permit). The permit stays valid for six months. Fees follow construction type and floor area, plus a $33.56 administrative fee and plan review at 25% of the estimated building permit fee.

Historic districts and covenants

In Houston's historic districts, the Certificate of Appropriateness comes first, and the Historic Preservation Office stamps the approved plans before they go to building review. Interior alterations and rear changes not visible from the street are exempt (Houston Office of Preservation). In The Woodlands, the village Residential Design Review Committee must approve any construction, alteration or repair on a lot with a home. Katy builds to the 2021 International codes, and Katy, Sugar Land, Pearland, Pasadena and Conroe each run their own building department.

Energy code and coastal wind

Houston enforces the 2021 International Energy Conservation Code with local amendments, and the metro sits in Climate Zone 2A. The City's repair form lists its minimums: window U-factor 0.40, solar heat gain coefficient 0.25, ceiling R-49 and wall R-13. Near the coast, the Texas Department of Insurance's catastrophe area covers Galveston and Brazoria counties and the parts of La Porte, Morgan's Point, Pasadena, Seabrook and Shore Acres east of Highway 146. To qualify for TWIA coverage there, most new construction and alterations need a certificate of compliance, usually a WPI-8 for work inspected during construction (TDI).

Structural engineering on Houston clay

Much of south, southwest, east and central Houston sits on the Beaumont formation, a clay that swells when wet and shrinks as it dries. A 2004 Houston-area foundation guide by engineer R. Michael Gray found that the large majority of homes built over the previous 25 years used post-tensioned slabs (Gray foundation guide). The ground also sinks. The Harris-Galveston Subsidence District says groundwater pumping lowered some areas more than 9 feet over four decades, and the loss cannot be reversed (HGSD).

HomeGuide puts structural plans at $500 to $3,000 for an average house or remodel, about $410 to $2,460 at Houston prices, and up to $12,000 for large projects (HomeGuide). Most engineers will not seal drawings they did not prepare or supervise. Our guide to structural coordination explains how the engineer's sheets fit the architect's set, and additions and remodels covers building out or up.

How to check a residential architect in Houston

1. Look up the architect with the Texas Board of Architectural Examiners. Its search covers names, cities and registration numbers and is updated daily, and a separate search covers firms (TBAE).
2. Check any engineer with the Texas Board of Professional Engineers and Land Surveyors. The board warns of fraudulently sealed engineering and surveying work sold through freelance marketplaces such as Fiverr and Upwork (TBPELS).
3. Ask who will seal the structural sheets, and who will prepare the elevation certificate and mitigation plan if the lot is in a floodplain.
4. Ask for Houston projects like yours: a floodplain rebuild, a historic district addition or a garage apartment.
5. Get a written contract that lists the phases, the fee for each, the number of revisions and who owns the drawings. TBAE also requires architects to disclose any financial interest in products they specify.

If you are still deciding what to build, our residential design guide walks through the early phases, and 3D renderings can show a raised house or a garage apartment from the street. For interiors, see our Houston interior designer guide.

Areas we cover

GOLDGCP architects and vetted Pros work across greater Houston:

• Houston, including historic districts and floodplain lots
• Katy and Cypress
• Sugar Land and Pearland
• Pasadena
• The Woodlands and Conroe

The suburbs run their own building departments, and unincorporated Harris County falls under the county engineer. Enter your ZIP code to see design and building prices where you live.