Kitchen Additions and Bump-Outs in Houston
A kitchen addition in Houston adds square footage to the house so the kitchen can grow: a 2 to 4-foot bump-out for an island, or a full addition with a new slab and roof for a kitchen and dining room. Kitchen Remodel Masters builds additions and bump-outs as part of our kitchen remodeling work, with Samuel, our project manager of 27 years, running the foundation, framing and trades.
This page covers when to add space versus reconfigure, bump-out versus full addition, the slab and roof tie-ins, the City of Houston permit, deed restrictions, the timeline, and market costs. Prices are Houston market ranges from named sources, not Kitchen Remodel Masters quotes.
Add Space or Reconfigure?
An addition is the most expensive way to get a bigger kitchen, so we look at the cheaper options first.
- Remove a wall. Opening the kitchen to the dining or living room often gives the island and the walkway you want. See our open-concept kitchen page and the wall removal project.
- Move the layout. Relocating the sink or the range, or swapping a peninsula for an island, changes how big a kitchen feels without changing the footprint.
- Steal a closet or hallway. A pantry closet or a back hall can become cabinet run.
Add space when the kitchen is small, under about 120 square feet, with no wall worth removing; when you want a seated island and a dining table in the same room; or when the 1950s and 60s ranch plans in Memorial, Spring Branch and Bellaire put the kitchen in a closed corner with no room to grow.
Bump-Out vs Full Addition
| Bump-out | Full addition | |
|---|---|---|
| Size | One wall pushed out 2 to 4 feet, about 30 to 100 sq ft | 150 to 400+ sq ft, a new room |
| Foundation | Small slab or cantilever off the existing framing | New slab with grade beams tied to the house |
| Roof | Shed roof or extended eave | New roof section tied into the existing roof |
| What it buys | An island, a wider walkway, a window seat, a run of cabinets | Kitchen plus dining, walk-in pantry, mudroom |
| Market cost | $4,000 to $30,000 (HomeAdvisor 2026); $20,000 to $50,000 for 40 to 100 sq ft (Block 2026) | $80 to $210 per sq ft (HomeAdvisor 2026); $300 to $750 per sq ft for a kitchen (Block 2026) |
| On-site time | 4 to 12 weeks (Block 2026) | 2 to 6 months (Block 2026) |
A bump-out costs more per square foot than a full addition because the permit, engineering and roof tie-in cost about the same whether you add 40 feet or 200.
Foundation on a Houston Slab
Most Houston homes sit on a slab-on-grade over clay soil that swells and shrinks with the weather. The addition gets its own slab with grade beams, and the engineer details the tie-in: rebar doweled and epoxied into the existing slab edge so the two slabs move together. The City requires engineer-designed plans for the new slab, and the inspector checks the forms and steel before the pour.
For a 2 to 3-foot bump-out, the engineer may cantilever the floor off the existing framing on a pier-and-beam house, which skips the slab. On a slab house, even a small bump-out gets a small slab.
Roof Tie-In
A full addition gets its own roof section framed into the existing roof. The valleys are flashed, the old shingles are woven or replaced across the joint, and the attic is opened so the two spaces share ventilation. A bump-out usually gets a shed roof tucked under the existing eave. Either way, the City requires windstorm or strapping details on the plans, and we match the roof pitch and shingle so the addition does not read as an add-on.
The City of Houston Addition Permit
Additions fall under the Residential Addition Permit, HPWCODE1134. The plan set needs:
- A Texas-registered survey or complete site plan showing property lines, easements, setbacks and the addition.
- Foundation plans with beam and steel details, floor plans, door and window schedule, roofing and framing plans, wall sections, a materials list.
- Windstorm or strapping compliance details and an energy compliance report.
- The Grading for Excavation and Fill Worksheet (Form 1094) and the Calculation of Impervious Percentage (Form 1207).
Processing is about 10 business days and the permit is valid for 6 months. The plumbing, electrical and gas inside the addition each need a trade permit, and the City requires licensed trade contractors to pull them. A legal survey goes to the inspector at the first structural inspection. See our kitchen remodel permits guide for fees.
Deed Restrictions, HOA and Setbacks
Houston has no zoning, but it has deed restrictions, and the City permit does not override them. Before the design is final we check:
- Setbacks. The City building line on the plat plus any rear and side setbacks in the deed restrictions.
- Lot coverage. Some subdivisions cap the house footprint. The City also routes lots that exceed 65 percent impervious cover to stormwater review.
- Architectural review. Many HOAs in Memorial, River Oaks and Sugar Land must approve exterior changes before work starts.
- Easements. Utility easements along the rear and side lines cannot be built over.
The City of Houston Legal Department deed restrictions page explains how they are enforced.
Timeline
- Design and engineering (3 to 6 weeks). Free consultation, 3D design, structural engineering, permit drawings.
- Permit (about 10 business days).
- Foundation (1 to 2 weeks). Forms, steel, inspection, pour, cure.
- Framing and roof (2 to 3 weeks). Walls, roof tie-in, windows, dry-in.
- Rough-ins and inspections (1 to 2 weeks). Plumbing, electrical, gas, HVAC.
- Finish (3 to 5 weeks). Drywall, flooring, cabinets, countertops, tile, paint.
Most single-story kitchen additions take 8 to 16 weeks of construction. Block Renovation (2026) puts bump-outs at 4 to 12 weeks on site and full additions at 2 to 6 months; Thumbtack (2026) puts additions at six weeks to more than six months. The existing kitchen stays in use until the last 2 to 4 weeks, when the old wall is opened and the two spaces are joined.
Design in 3D
Sean draws the addition in 3D with the existing kitchen so you see the island, the walkway and the dining area before the slab is poured. Daily photo updates and daily cleanup run through the build. Our kitchen remodel cost page shows what the finish-out inside the addition runs in Houston.
Get an Exact Number
Sean comes to your home, checks the lot, the slab and the roofline, pulls the plat and deed restrictions, and shows you a bump-out and a full addition in a free 3D design so you can compare. The consultation and the 3D design are free. Call (713) 364-6603 or request your free consultation.
Sources
- HomeAdvisor, “How Much Does a Home Addition Cost?” https://www.homeadvisor.com/cost/additions-and-remodels/build-an-addition/ (updated June 2026)
- Bob Vila, “How Much Does a Home Addition Cost?” https://www.bobvila.com/articles/home-addition-cost/ (updated May 2024)
- Block Renovation, “Kitchen Additions: Options and Cost Considerations” https://www.blockrenovation.com/guides/building-an-addition-for-your-kitchen-costs-design (August 2026)
- Thumbtack, “How much does a home addition cost?” https://www.thumbtack.com/p/home-addition-cost (updated July 2026)
- Houston Permitting Center, “Residential Addition Permit (HPWCODE1134)” https://www.houstonpermittingcenter.org/hpwcode1134
- City of Houston Legal Department, “Deed Restrictions” https://www.houstontx.gov/legal/deed.html
Frequently Asked Questions
How much does a kitchen addition cost in Houston?
Home additions run $80 to $210 per square foot nationally, and a kitchen addition averages about $55,000, per HomeAdvisor (2026). Bob Vila (2024) puts a 200-square-foot kitchen addition at $48,000 to $95,000, and Block Renovation (2026) puts a professionally built kitchen addition at $300 to $750 per square foot. Kitchen Remodel Masters prices each addition after a free in-home visit and 3D design.
What is a kitchen bump-out?
A bump-out pushes one exterior wall out 2 to 4 feet along part or all of its length, adding roughly 30 to 100 square feet. It is enough for an island, a wider walkway or a run of cabinets. Bump-outs cost $4,000 to $30,000 per HomeAdvisor (2026) and $20,000 to $50,000 for 40 to 100 square feet per Block Renovation (2026).
Should I add space or reconfigure the kitchen I have?
Reconfigure first. Removing a wall to the dining room, moving the sink or adding an island often gives the room you want without a foundation. Add space when the kitchen is under about 120 square feet, when there is no wall to remove, or when you want a seated island plus a dining area in the same room.
Do I need a permit for a kitchen addition in Houston?
Yes. Additions fall under the City of Houston Residential Addition Permit (HPWCODE1134). It needs a Texas-registered survey or site plan, foundation plans with beam and steel details, framing and roofing plans, wall sections, windstorm details and an energy report. Processing is about 10 business days and the permit is valid for 6 months. Plumbing, electrical and gas need their own permits.
How does the new foundation tie into my slab?
Most Houston homes sit on a slab-on-grade. The addition gets its own slab with grade beams, and an engineer details how it ties to the existing slab with doweled rebar so the two do not move apart. The City requires engineer-designed plans for the new slab, and the inspector checks the steel before the pour.
How long does a kitchen addition take?
Most single-story kitchen additions take 8 to 16 weeks of construction after the permit is issued. Block Renovation (2026) puts bump-outs at 4 to 12 weeks on site and full additions at 2 to 6 months. Design and engineering take 3 to 6 weeks before that, and the City permit adds about 10 business days.
Can deed restrictions stop a kitchen addition?
Yes. Houston has no zoning, but most subdivisions have deed restrictions that set rear and side setbacks, lot coverage and sometimes an architectural review. The City does not enforce them for you, and a neighbor or HOA can sue to remove a structure that violates them. We check the recorded restrictions and the City building line before the design is final.
Will I be able to use my kitchen during the addition?
Mostly, yes. The new slab, framing and roof go up outside the house while the existing kitchen stays closed off. The kitchen goes down for the last 2 to 4 weeks, when the old exterior wall is opened and the two spaces are joined, cabinets are set and countertops are installed.