How Much Does a Home Addition Cost in Utah? (2026 Guide)
A home addition changes your home's footprint, not just the space inside it. That extra structural work shows up in the price. As of 2026, a home addition costs about $21,900 to $83,356 nationally. The average lands near $51,023, or about $80 to $210 per square foot for a standard addition. A second story costs more, $100 to $300 per square foot, because it needs a closer structural review before it goes up.
How much does a home addition cost in Utah in 2026?
HomeAdvisor's national home addition cost guide, updated June 17, 2026, puts most addition projects at $21,900 to $83,356. The average project lands near $51,023. Per square foot, a standard addition runs $80 to $210. A second story runs more, $100 to $300 per square foot, since it adds structural load instead of new foundation, and a full second story often lands well above that typical range.
Here is how that budget breaks down by addition type, based on the same HomeAdvisor guide:
| Addition type | Cost range |
|---|---|
| Second story | $100,000 to $250,000+ |
| Garage | $25,000 to $50,000 |
| Bump-out room | $4,000 to $30,000 |
| Front porch | $4,600 to $22,200 |
| Simple in-law suite | $8,600 to $21,600 |
And the individual cost drivers behind those totals:
| Cost driver | Range |
|---|---|
| Foundation | $5 to $37 per square foot |
| Permits | $200 to $3,000 |
| Plumbing | $600 to $1,600 |
| Excavation | $1,500 to $5,800 |
| Roofing | $120 to $400 per 100 square feet |
Source: HomeAdvisor, updated June 17, 2026.
These are national market ranges. They are not our quote. We do not post one fixed online price for a home addition. No two additions are the same size, the same type, or on the same lot. Every home addition job starts with a free, on-site walkthrough and a written estimate before you spend a dollar on drawings. Call for a free estimate and get a real number for your addition instead of a national average.
What drives a home addition's price up or down?
Total square footage sets the baseline. A few other factors move the price more than size alone. A ground-level room addition needs a new foundation section. It also uses up some yard space. A second-story addition builds up instead. It keeps your yard, but it needs a closer look first. We have to check if your existing walls and foundation can carry the extra weight above them.
These are the same cost factors we quote against on every home addition:
- Total square footage and number of rooms added.
- Ground-level addition versus second-story addition.
- Foundation type and how it ties into your existing home.
- New plumbing, electrical, and HVAC runs to the addition.
- Roofline and siding work needed to match your existing house.
- Interior finish level, like flooring, cabinets, and fixtures.
- Permit and structural engineering review for your city.
We visit your property, take real measurements, and tell you honestly what fits your lot and your budget before you commit to drawings.
Do you need a permit for a home addition in Utah?
Yes. Utah cities require a building permit for any home addition. That is because it changes your home's footprint or structure. In Kaysville, the city's own building department reviews the plans, not Davis County. Review runs through the City Inspect online portal. That takes about two weeks. Inspections need 24 hours' notice, with no same-day option.
Kaysville's design rules also set real structural minimums for addition work. Footings have to reach at least 30 inches deep. The structure has to handle a 140 mph wind speed. It also has to meet Seismic Design Category D2, the city's earthquake standard. These are not optional upgrades. They are baseline rules your addition's engineering has to meet before the city signs off.
We prepare the drawings, submit the permit application to your city, and schedule the required inspections as part of your project. That paperwork sits on us, not on you.
How long does a home addition take to build?
Most home additions take about two to four months to build once your permit is approved, depending on size and whether you are adding a second story. Permit review itself can add several more weeks in Davis County, on top of the build time, so plan the calendar alongside the budget.
Most homeowners stay in their house during a home addition. We section off the work area and keep your entrances and daily living space clear while we build. Noise and dust run heaviest during framing and demolition, then taper off as the crew moves to drywall, flooring, and trim.
Why do older Davis County homes cost more to add onto?
An older home often needs more engineering work before an addition can tie in safely. Nearby Kaysville is a good example: 2,818 of its 9,317 houses, close to a third, went up before 1980. Construction Solutions of Utah works that whole stretch of Davis County out of its Bountiful base. Salt Lake City's numbers run even higher. The median home there was built in 1972. About 41 percent of its 107,629 housing units predate 1960.
An addition on one of these older homes has to tie into an old foundation or framing system. That system was often built to a code cycle decades old. So the review takes more work, not less. We have to check the existing walls and foundation against today's standards, including Kaysville's 140 mph wind and D2 seismic rules. Newer homes built after 2000 tie in more easily. They already use modern truss framing, so there is less upfront engineering work.
Ready to see your real number instead of a national range? Contact us for a free estimate, no strings attached. We are licensed in Utah, number 14241087-5501. You can look that up at secure.utah.gov/llv/search. We are also insured, family owned, and veteran owned, and we work out of Bountiful. Owner David Despain grew up in the trades. His family brings three generations of hands-on skill to structural work like framing and roof tie-ins. For the kitchen once your new space is framed in, see a kitchen remodel. For the full range of what the crew builds, see our general contractor team. We build across Davis and Salt Lake County, from Kaysville, with its strict footing and seismic rules, to Salt Lake City's older housing stock.
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Questions about your general contractor & remodeling job? We serve Bountiful and the surrounding area with honest, upfront advice.
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FAQ
Related questions
How much does it cost to add 1,000 square feet to your house?
At the national standard-addition range of $80 to $210 per square foot, 1,000 square feet runs about $80,000 to $210,000. A second-story addition of the same size, at $100 to $300 per square foot, runs about $100,000 to $300,000. These are national market ranges, not a quote. Your real number depends on foundation type, finish level, and how much plumbing or electrical work the space needs.
How much should a 20x20 room addition cost?
A 20x20 addition is 400 square feet. At the national standard range of $80 to $210 per square foot, that runs about $32,000 to $84,000. Built as a second story instead, at $100 to $300 per square foot, the same 400 square feet runs about $40,000 to $120,000. Framing, foundation type, and finish choices move these numbers.
What is the most expensive part of a home addition?
A full second story. HomeAdvisor's 2026 data puts a second-story addition at $100,000 to $250,000 or more, well above a ground-level room addition. A second story needs a closer structural review, since your existing walls and foundation now have to carry real added weight above them, on top of the usual foundation, plumbing, and roofline costs a ground-level addition already carries.