Home additions · Williamson County, TX
More room, without moving.
Whether it's a bedroom, an in-law suite, or a second story, we design additions that match your home inside and out, with an estimate range after the first visit and craftsmanship backed for life.
Our promise
Backed for life
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What's included
Additions that belong
Rooflines, siding, trim, and proportions matched, inside and out, so the addition looks like it was always part of your house.
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Bedroom & bathroom additions
The extra room your family needs, built to match the rooms you already have.
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In-law suites & multigenerational spaces
Private entrance, kitchenette, accessible bath, parents close, everyone with their own space.
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ADUs & guest houses
A separate space on your lot, for family today, or rental income tomorrow.
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Second-story additions
Go up instead of out, structural engineering handled in-house.
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Sunrooms & living-space extensions
More light and more room in the spaces where you already live.
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Garage conversions
Turn unused square footage into an office, gym, or guest room.
Our work
Home additions projects
El Cielo garage, game room and pool house, Leander, TX
A detached three-car garage with a game room above, plus a pool-house bath and covered patio in Crystal Falls, Leander TX. The slope meant building the retaining wall and septic system first.
Hoover residence: addition, then kitchen
A side addition with a home office, laundry and guest bath, then a kitchen remodel months later that removed the load-bearing columns. Drainage had to be corrected first.
Before and after
One project, start to finish
Our work
Additions that look like they were always there
Matched rooflines, siding, and trim, see if you can spot where the original house ends.
- Backyard office & studio, Cedar Park
- Family room addition
- Living-space extension
- Second story
- Garage conversion
- Outdoor living deck, Cedar Park
How we work
Clear from the first visit
Design, engineering, and Williamson County permitting in one plan, no hand-offs between an architect, an engineer, and a builder.
- 01
Tell us about the space you need
The form takes two minutes. Greg or Pam calls you back within one business day.
- 02
Walk your home with Greg
He listens to what you need, then puts 40 years in the trade behind a straight read on the best way to add it.
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An estimate range, then one clear plan
You get a range after that first visit, then design, engineering, and permits in one written estimate and one schedule.
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Built right, backed for life
An addition that blends structure to shingles, with a lifetime warranty on the craftsmanship.
Google reviews
Around 75 homes and remodels, 95% from referrals
“…a garage that looks like it fully matches our home… no one could tell it was added after the fact.”
“My husband and I used Flenn Custom Home and Remodeling to add a home office as an extension to our residence… We appreciated the integrity with which he interacted with us, the workmanship of the finished project…”
“He always answered calls, text or emails promptly and guided us through the project without any problems or frustrations.”
Request an estimate
Tell us about the space you need
Two minutes, no pressure. Greg or Pam will call you back within one business day.
No obligation, a straight read either way Your info stays with us A real person calls you, no call centers
Loading the estimate form…
Straight answers
Questions homeowners ask about home additions
Will the addition match our existing house?
That's the whole job. We match rooflines, siding, trim, and proportions, inside and out, so it reads as original, not added on.
Do we need a permit for an addition in Williamson County?
Almost always, yes. We handle permitting, engineering, and inspections end to end, it's built into the plan and the schedule.
How long does an addition take?
A single room is quicker than an in-law suite; a second story takes the longest. You'll get a written schedule with your estimate, and we keep you posted as the work moves.
Can we live at home during construction?
Usually, yes. Additions build from the outside in, and we schedule the breakthrough days with you in advance.
Is an addition worth it versus moving?
If you love where you live, usually yes, you skip selling costs and keep your schools, neighbors, and equity. If moving actually pencils better for you, Greg will say so. You get the range before you commit to anything.
Can you build an in-law suite or ADU?
Yes, it's one of the fastest-growing things we build: aging parents, adult kids, and rental income all drive it. Private entrances, kitchenettes, and accessible baths included.
Where we build
A local builder for local homes
Family-run from Georgetown, Greg is on your job site, not in an office.
- Georgetown, TX
- Round Rock, TX
- Cedar Park, TX
- Leander, TX
- Liberty Hill, TX
- Hutto, TX
- Pflugerville, TX
- Taylor, TX
- Jarrell, TX
- Jonah, TX
- Manor, TX
- Austin, TX
