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What Does a Master Suite Addition Cost in DFW?

Straight answers on home additions from a Fort Worth general contractor with 500+ projects since 2009 — fixed price and a firm schedule before work begins.

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THE SHORT VERSION

A master suite addition in DFW costs $150,000 to $350,000 for a 400 to 700 square foot suite with a full primary bathroom and walk-in closet — roughly $250 to $450 per square foot finished. Building up over the existing footprint usually costs less than building out onto new foundation.

What a master suite addition actually includes

A master suite is not a bedroom. It is a bedroom, a full primary bathroom, and a walk-in closet — which means it carries the two most expensive rooms in residential construction inside one addition. That is why the per-square-foot number runs well above a plain room addition: you are building a bathroom, and bathrooms are where the plumbing, waterproofing, tile, and fixture budget lives.

Most DFW master suite additions land between 400 and 700 square feet. Below 400 the suite starts feeling like a large bedroom with a compromised closet. Above 700 you are usually into sitting-area and coffee-bar territory, where the cost per foot actually drops because the added space is simple.

Master suite addition costs at a glance

Approach	Typical Cost	Typical Timeline
Convert & expand existing rooms	$90,000–$150,000	10–14 weeks
Ground-floor addition on new foundation	$150,000–$275,000	16–24 weeks
Second-story master suite	$175,000–$350,000+	20–28 weeks

These are typical DFW ranges, not a quote. Birdseye prices every addition under a fixed-price contract after a walkthrough and design, so the number you approve is the number you pay.

Build up or build out?

On a tight lot, building up is often the only option, and in North Texas a second story runs $185 to $400+ per square foot. Building out is simpler structurally but consumes yard, requires new foundation, and can run into setback limits or an HOA. The right answer is usually decided by the lot and the existing roof structure, not by preference — which is why the structural evaluation comes before the design, not after.

What moves the number most

The bathroom. A primary bathroom with a freestanding tub, a large curbless or walk-in shower, a double vanity, and a separate water closet can carry $60,000 to $90,000 of the total by itself. After that: the closet build-out, whether HVAC needs a new zone or an added system, and whether the existing electrical panel has capacity for the new load.

Planning a project? See our main floor and second story additions page for scope, process, and recent work.

Frequently Asked Questions

Is a master suite addition worth it in DFW?

In most North Texas neighborhoods a well-built primary suite recovers a meaningful share of its cost at resale and makes the house competitive against newer inventory. It rarely returns 100 percent — the case for it is usually living in the house, not selling it.

How long does a master suite addition take?

Plan on four to seven months from signed contract to final walkthrough: two to six weeks of design and engineering, four to eight weeks for permits and structural review depending on jurisdiction, and 16 to 28 weeks of construction.

Do I need an architect for a master suite addition?

You need drawings and, for most additions, an engineer’s stamp. With a design-build contractor those come inside one contract instead of a separate architect fee. Birdseye handles design, engineering, permitting, and construction under a single fixed price.

Can you add a master suite over a garage?

Often yes, but the garage foundation and framing were rarely designed to carry a conditioned second story. It requires an engineering evaluation and usually foundation and framing reinforcement, which is a real cost line rather than a formality.

Will my HVAC handle a new master suite?

Frequently not. Adding 400 to 700 conditioned square feet typically requires either a new zone, a dedicated mini-split, or an upsized system. That evaluation happens during design so the cost sits in the contract instead of appearing as a change order.

Let’s price your project

A free walkthrough and a fixed-price scope for your exact project — no pressure, no guesswork. Serving Haslet, North Fort Worth, Northlake, Westlake, Justin, Roanoke, Keller, Southlake, Trophy Club, Colleyville, and North Richland Hills.