Serving The Woodlands, Houston and communities across Greater Houston

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Home additions and room additions in Houston

Adding a primary suite, family room or second story lets you stay in the neighborhood you chose. We start with the rules that decide what you can build, then design an addition that looks like it was always part of the house.

  • Primary suites, family rooms and second stories
  • Deed-restriction, setback and floodplain checks first
  • Rooflines, brick and siding matched to the house
Request an estimate See typical costs
Finished rear room addition with French doors, matched siding and roofline

Types of additions we build

Primary-suite additions

A bedroom, bathroom and closet added on the ground floor, often to move the primary suite downstairs.

Family rooms and kitchens

Extending the back of the house for a larger kitchen or living area.

Second-story additions

Building up where the lot is tight, after an engineer confirms the existing structure can carry it.

Bump-outs

Small additions of a few feet that make a kitchen, bathroom or dining room work.

Garage conversions and ADUs

Turning a garage into living space or building a garage apartment. See garage conversions.

Sunrooms and enclosed patios

Enclosing an existing patio or adding a conditioned room with lots of glass.

What we check before anyone draws

Additions fail at the permit or HOA stage when nobody checks the rules first. Before design, we look at:

  • Deed restrictions and HOA rules: setbacks, building lines, height and materials
  • The city or county building code and permit path for your address
  • Floodplain status, which can set the floor height of the addition
  • Foundation type and how the new slab will tie into the old one
  • Whether your HVAC system, electrical panel and water heater can serve the new space

Build up or build out?

Building out

Usually simpler and less disruptive, and keeps rooms on one level. Needs yard space and room within the setbacks.

Building up

Keeps the yard and works on narrow lots, but needs engineering of the existing structure, a stair and more disruption while the roof is open.

How much does a room addition cost in Houston?

Published Houston figures for a primary-suite addition give a sense of scale for a full suite with a bathroom.

ProjectPublished cost
Primary-suite addition (midrange)About 24×16 ft bedroom suite with a bathroom and walk-in closet $162,563
Primary-suite addition (upscale)About 32×20 ft suite with premium finishes and a larger bathroom $331,628

Source: Cost vs. Value 2025, Houston, TX (Zonda / Journal of Light Construction, released September 2025). These are modeled costs for a fixed project specification, not bids.

What moves the price

  • Size of the addition and whether it includes a bathroom or kitchen
  • Foundation work and tying into the existing slab
  • Roof tie-in and matching brick, siding and windows
  • HVAC capacity: extending the existing system or adding a new one
  • Engineering, survey and permit requirements

Smaller additions without plumbing cost considerably less. We price yours after a site visit and a look at the lot survey.

Do you need a permit for a room addition?

Yes. Additions need building permits with drawings, and usually engineered foundation and framing details. Many neighborhoods also require HOA or architectural approval before the city will see the plans. We coordinate the drawings with licensed design professionals, submit the permits and manage plan-review comments.

How we handle permits

How an addition project runs

  1. Feasibility visit

    We review the lot, survey, deed restrictions and floodplain status, and talk through what you need.

  2. Concept and budget

    A concept plan and a budget range before detailed drawings.

  3. Drawings and engineering

    Construction drawings, foundation and framing engineering, and selections.

  4. Approvals and permits

    HOA or architectural review, then building permits.

  5. Foundation to dry-in

    Foundation, framing, roof tie-in, windows and exterior, with inspections.

  6. Systems, finishes and walkthrough

    Electrical, plumbing, HVAC, insulation, drywall and finishes, then the final walkthrough.

A porch addition, during and after

A new gable porch built over an existing front entry: framing tied into the roof, then columns, a cedar ceiling and trim to match the house.

Gable porch addition being built over a front entry
During construction
Finished gable porch addition with columns and a cedar ceiling
Finished

Home additions: common questions

Still unsure? Ask us directly and we will answer in plain terms.

How much does a room addition cost in Houston?
A full primary-suite addition with a bathroom is published at about $162,600 midrange and about $331,600 upscale for Houston (Cost vs. Value 2025). Smaller rooms without plumbing cost less. Foundation, roof tie-in and HVAC drive the number.
Do I need a permit for a room addition in Houston?
Yes. Additions need building permits with drawings, and many neighborhoods also need HOA or architectural approval. We handle both.
How long does a room addition take?
Planning, approvals and permits often take as long as construction. Once permitted, a single-story addition commonly takes a few months to build, depending on size and finishes.
Is it better to build up or out?
Out is usually simpler if the lot and setbacks allow it. Up keeps the yard but needs engineering of the existing house and a stair. We look at both at the feasibility visit.
Can my existing AC handle the new room?
Sometimes. We check the system’s capacity against the added space; many additions need a dedicated mini-split or a separate system.
Will the new roof, brick and siding match the house?
That is the goal. We match rooflines and source brick, siding and windows to blend with the original house; exact brick matches can take time to find, and we tell you early if one is not available.
Two-car garage with a new gable roof extension on timber posts
Garage conversions Turn a garage into a bedroom, office, suite or apartment.
Crew building an octagonal coffered ceiling during a renovation
Whole-home renovation Several rooms or the whole house, as one coordinated project.
Crew members reviewing construction drawings on a job-site table
Permits and approvals Drawings, submittals, plan-review corrections and inspections handled.

Planning a home addition?

Send a few details and we will follow up to schedule a site visit. You get a written, itemized estimate before any work starts.

  • Written, itemized estimate
  • Permits and approvals handled for you
  • One point of contact from start to finish
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Request an estimate

Tell us what you are planning. We follow up to schedule a site visit.

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