Home additions, Wimberley, TX
RenovatePros builds home additions in Wimberley: new bedrooms, more living space and second stories. We do not post an addition price yet. You get a free consultation and an itemized quote. In Wimberley the septic system, the slope and the flood map can each shape an addition, so we check all three first.
- 4.9 on Google 59 reviews
- Owner on site managing the crew
- Itemized quote every line, up front
Home additions in Wimberley: septic, slope and flood
Adding on in Wimberley runs into the land as much as the house.
- Inside city limits, the residential building permit is $40 plus $0.40 per square foot ($0.35 per square foot above 1,450), on top of the $50 application and $75 plan review (fees since October 1, 2025).
- On a slope over 15%, the city needs a site plan review before it issues a building permit.
- Hays County sizes septic by bedrooms and floor area. An addition may need a septic upgrade, and the county reviews your plans to decide.
- Outside city limits, an addition may need a Hays County development permit, and the county does not inspect single-family work, so a third-party inspector is required.
- The city requires an outdoor lighting plan with the permit, and new outdoor bulbs can be no warmer than 3000K.
- FEMA’s new Hays County flood maps took effect January 17, 2025.
How we plan an addition in Wimberley
First we check the flood map and the slope of your lot. Then we find the septic tank and drain field and ask how big the system is, because a new bedroom can mean a bigger one. Those answers tell us where the addition fits.
Our in-house design team draws the addition to match the house, with the lighting plan the city wants. You get an itemized quote, and the owner is on site managing the crew.
Home additions: the full service page
City of Wimberley, Hays County, FEMA and Census pages, as researched 2026-10-16. Rules change; we confirm them for your address.
What homeowners say
4.9 (59) Google reviews
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Top-notch quality and fantastic customer support. Five stars!
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The work was both high quality and affordable, and it was completed in a short amount of time.
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Great communication throughout the process. Highly recommended!
Home additions in Wimberley: questions we hear
How much is a city permit for an addition in Wimberley?
Since October 1, 2025, the residential building permit is $40 plus $0.40 per square foot, or $0.35 per square foot above 1,450. Add $50 to apply, $75 for plan review and $55 per inspection.
Will a bedroom addition need a bigger septic system?
It may. Hays County sizes septic by bedrooms and floor area and reviews your plans to decide.
My lot is steep. Does that change anything?
Yes. On a slope over 15%, the city needs a site plan review before it issues the building permit.
Does the dark sky rule apply to my addition?
Yes. The city asks for an outdoor lighting plan with the permit, and new bulbs can be no warmer than 3000K.
More remodeling in Wimberley
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Kitchen remodeling in Wimberley
Posted estimates of about $15,000 to $100,000, with the city permit planned in.
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Bathroom remodeling in Wimberley
Bath remodels planned around septic, the river and city permits.
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Whole-home renovation in Wimberley
Posted estimates of about $100,000 to $500,000, with dark sky lighting planned in.
Home additions in nearby towns
78737 and the Hill Country