AUREABUILDHome additions · Austin, Texas
The hard part of an addition is where the new space meets the old house. Rooflines, floor heights, ductwork and the electrical panel all have to agree, and the lot and the existing structure decide how much room you have to work with.
Who this is for: Homeowners planning a home addition or second story.
First steps
Additions go wrong at the joint. The new roof doesn't meet the old one cleanly. The new floor sits a half inch off from the old one. A wall everyone assumed was non-structural turns out to carry the ceiling above it. The existing air conditioner can't cool another room, and the panel has no space for the new circuits.
Every one of those can be found before construction by looking at the attic, the framing, the equipment and the panel, and fixing a drawing is far cheaper than fixing a finished wall. Expect a good deal of the early conversation to be about the existing house, even though the new space is what you're excited about.
A ground-level addition needs a new foundation and a roof that ties into the old one. A second story puts new weight on a foundation and framing that were designed for less, so an engineer has to say whether they can carry it. Converting a garage or attic skips some new construction but is limited by what's already there: ceiling height, slab condition, stair access and where the ducts and plumbing can go.
The first idea often changes once the lot and house are reviewed. That's normal. If the extra space is meant to be a separate dwelling, look at ADU construction instead, and if several rooms are changing, whole-home renovation may be the better frame.
East of I-35, expansive clay moves with moisture and pushes on foundations. In the Hill Country, shallow limestone complicates excavation and drainage. A new foundation next to an old one has to deal with both, and the two won't necessarily move together. The guide to clay and limestone site conditions explains what an engineer looks at.
Trees, utility lines and easements eat into the space an addition could use. Some lots fall under flood and watershed rules. Many neighborhoods also require HOA or deed-restriction approval of the design, and that approval can change both the drawings and the schedule, so it goes at the front of the line.
An addition normally needs drawings, structural engineering and a permit. The City of Austin permits through its Development Services Department, while Round Rock, Cedar Park, Lakeway, Pflugerville, Georgetown and West Lake Hills each run their own office with their own review. What's required and how long review takes comes down to the project and the office.
If you already have a designer or engineer, we'll coordinate with them. If you don't, we can point you toward how to start. A price before plans exist is a preliminary range and gets labeled as one. After plans and engineering it firms up considerably, though selections and conditions inside the walls can still move it. Our permit guide covers this stage in more detail.
Matching existing siding, brick, flooring or trim is harder than it looks, because the product may no longer be made and the old material has weathered. Decide early what to match, what to blend and what to treat as a clear change. Scope drift lives here too: a bigger bathroom, an extra window, a covered patio. Each is reasonable alone, and together they move the budget. Reading about how to compare renovation bids before you review proposals helps you notice what each one assumes.
The order is lot and house review, preliminary scope and range, plans and engineering, proposal, permit, then construction. On site that means preparation and foundation, framing and roof, the tie-in, rough-in for the trades and inspections, insulation, then finishes.
Most of the work happens outside the existing house, so many households stay put. The tie-in is the stretch that hurts, when openings are cut into the home and dust control takes real effort. Concrete, framing and roofing all react to summer heat and spring storms, and how long the whole thing takes depends on size, design complexity, permit review and selections, which is why how long a remodel takes gets a full answer there. The project ends with a walkthrough, a punch list, permit closeout where it applies and the equipment documents for the new space.
Common questions
That depends on zoning, setbacks, easements, trees, drainage and any HOA restrictions, and all of those change from lot to lot and city to city. A written zoning check or a call to the local permit office settles it. We can help you gather what that check needs.
Sometimes. An engineer has to confirm the existing foundation and framing can take the extra load, and some houses need reinforcement to get there. A second story can also be disruptive to live through, because the roof comes off. We'll explain the trade-offs before you decide.
Additions need drawings and usually structural engineering from an architect, designer or engineer. If you have one, we'll work with them. If you don't, we can talk through how to find the right starting point and keep the plans, permit and construction lined up.
Often, yes, since much of the work is outside the existing house. The hardest part is the tie-in, when walls are opened to connect the new space. Dust control and access get planned with you, and you'll hear which stages will be the roughest.
It can be made to look like it belongs. Exact matches for older siding, flooring or trim are sometimes hard to find, so we raise the choice early: match it, blend it, or make the difference deliberate.