Home Additions & ADUs in Richardson, TX

Richardson is a built-out mid-century suburb, so for most families the real choice isn't "move to a bigger house in Richardson" — it's "add the space to the ranch we already own." The location does the arguing: the Telecom Corridor, UT Dallas, and a short run down US-75 are hard to give up, and a well-planned addition keeps you on your established lot while adding the primary suite, home office, or in-law suite the original 1950s or 60s builder never drew. What makes Richardson additions their own kind of project is the housing stock itself — wide, single-story ranch homes on generous mid-century lots — and the way a brand-new wing has to tie into a house that's been resting on Blackland clay for sixty years.

The ADU question, answered honestly for Richardson

If you've read about backyard cottages and granny flats in bigger cities, hold that thought before you design around it. Whether a fully separate, rentable second dwelling is allowed on your single-family lot is a zoning question specific to your property, so confirm any detached-cottage plan against Richardson's current code with the city before you commit to it. What we can promise works are the attached paths: a bump-out or full ground-floor addition, a second-story or in-law suite under the main roof with its own entrance and bath, or a garage or bonus-room conversion into self-contained space. On a wide ranch footprint those routes are often the more natural fit anyway — the house already sprawls, so extending it reads as original far more easily than bolting a cottage onto the yard.

Where the square footage comes from on a ranch lot

Mid-century ranches were built wide and low on lots with room to spare, which usually means the addition goes out at grade rather than up. A ground-floor wing spends lot coverage but keeps the single-story character these neighborhoods are known for. Building up is possible, but a second story asks a sixty-year-old slab and framing to carry loads they were never designed for, so an engineer has to confirm the structure before a wall goes up. And in Canyon Creek — notably hilly for North Texas — a sloped lot narrows where an addition can reasonably sit and makes grading part of the footprint decision. Setbacks and lot coverage are the first thing to check, before you fall in love with a floor plan.

Tying new to old on Blackland clay

An addition marries a brand-new slab to one that's been settling on expansive Blackland Prairie clay for six decades, and two foundations of different ages want to move independently. Without an engineered connection and a foundation matched to the original, the joint between old and new is exactly where the first crack shows up. A new wing also adds roof area, concentrating runoff at a new corner — so gutters and lot grading get reworked as part of the job, and on Canyon Creek's slopes that water management is even less optional. Get this right up front and the addition ages with the house instead of against it.

Making it look like it was always there

The difference between an addition and a bolt-on lives in the match, and a mid-century ranch has a specific vocabulary to honor: long horizontal proportions, a low-pitched roofline, wide brick elevations, and window lines that run with the house rather than against it. Sourcing brick to blend with a wall that's weathered sixty years is its own small project, and tying a new low-slope roof cleanly into the old one is the detail that decides whether the new space disappears or announces itself. Matching the ranch on its own terms is most of the work.

Permits and city registration, in order

Any change to square footage needs a building permit through the City of Richardson's Building Inspection division — including enclosing a patio or converting the garage, which owners often assume is "free" square footage. Richardson also requires a contractor to hold current city registration — a hundred dollars, valid for one year — before it will issue that permit, and remodel plan-review submittals are emailed to permits@cor.gov. The new envelope has to meet energy code, and the licensed trades permit their own work underneath the main permit. That's a coordinated stack of approvals to sequence before framing starts.

One team owns the seam

The whole promise of an addition is that it looks like it was always there — and that is a coordination problem, not a single trade's task. Foundation, framing, roofline tie-in, brick match, HVAC load, and drainage all have to meet at one seam and disappear. That is precisely what a general contractor exists to own — the heart of the design-build approach: one accountable team from permit to paint. The Remo Guys has been adding onto Richardson homes since 2019, insured and bonded, treating the join between old and new as the whole job.