Need More Space? We Build Home Additions Too.
Sometimes the right answer isn't a separate unit — it's more room in the home you already love. We design and build additions that flow seamlessly from your existing house.
ADU or Addition? We'll Tell You the Truth.
We're known for ADUs — but we build home additions too, and we'd rather point you to the right project than sell you the wrong one. The honest difference comes down to one question: do you want more space in your own home, or a separate unit you can rent?
An addition extends your existing house — an extra bedroom, a primary suite, a bonus room, a second story, or an in-law suite. It ties into your current roof, foundation, and utilities, which usually makes it cheaper per square foot and faster to build than a ground-up ADU. The trade-off: an addition is part of your home, so it can't be rented as a separate unit. If rental income is the goal, an ADU is the better tool — see our honest side-by-side comparison →
Additions We Build
Room Addition / Bump-Out
An extra bedroom, office, or expanded living/dining area off your existing footprint. The most budget-friendly way to gain dedicated space.
Primary-Suite Addition
A new primary bedroom + bath (and often a walk-in closet) — a common upgrade for growing families or aging-in-place on a single level.
Second-Story Addition
Build up instead of out when your lot is tight. The biggest space gain, with a longer timeline and structural engineering involved.
In-Law Suite (Attached)
A bedroom + bath (sometimes a kitchenette) for family who want to be close. Note: add a full kitchen + separate entrance and it legally becomes an ADU — we'll walk you through that line.
Twin Falls Code: What an Addition Has to Meet
- →Setbacks: An addition follows your home's primary-dwelling setbacks for your zoning district (commonly 20 ft front, 5–7 ft side, 20 ft rear in R-2/R-4) — not the reduced accessory-building setbacks an ADU uses.
- →Lot coverage: Your home + addition + any accessory buildings must stay within the district's max lot coverage (60% in R-2/R-4).
- →Permits: Building permit + trade permits — no ADU Zoning Use Permit, since an addition isn't a separate dwelling.
- →Not a separate unit: An addition shares your home's entrance, kitchen, and utilities. It can't be legally rented as its own unit — that's the defining line between an addition and an ADU.
Code specifics are confirmed per parcel with City of Twin Falls Planning & Zoning during your assessment.
Not Sure Which One You Need?
That's exactly what our assessment is for. We'll look at your lot, your budget, and your goals and tell you honestly whether an addition or an ADU is the smarter move — and then build whichever one is right. Compare ADU vs. addition →
How We Build Your Addition
The same guided, no-surprises process we use for ADUs
Readiness Call & Assessment
We talk through what you need the space for, then assess your lot, setbacks, and existing structure to confirm an addition is the right fit — and whether an ADU might serve you better.
Design
Our design team draws an addition that flows naturally from your existing home — matching rooflines, ceiling heights, and finishes so it reads as one house, not a bolt-on. Plans are stamped and permit-ready.
Permitting
An addition needs a building permit plus trade permits (electrical, plumbing, mechanical) — but NOT the ADU Zoning Use Permit, so the path is simpler. We handle every submission and inspection with the City.
Construction
Foundation/tie-in, framing, roofing, mechanical, and finishes — all by our licensed team, sequenced to keep your home livable during the build. We manage inspections through final sign-off.
Tell Us What You're Trying to Solve
Book a free 10-15 minute Readiness Call. We'll help you figure out whether an addition or an ADU gets you there — honestly, with no pressure.