In 2026, a home addition in Texas Hill Country costs $120–$320 per square foot. Most Burnet and Marble Falls homeowners spend $45,000–$180,000 total depending on addition type, finish level, and site conditions. A basic room addition runs $120–$160/sq ft; a master suite or second-story addition with plumbing and HVAC integration costs $200–$320/sq ft.
A home addition is one of the most cost-effective ways to gain living space in Texas Hill Country — especially as Burnet, Marble Falls, and Liberty Hill real estate prices continue climbing in 2026. Instead of selling and buying up, many homeowners are choosing to build out or build up, adding 300–1,200 square feet to their existing homes at a fraction of replacement-home costs. But accurate local pricing is hard to find. Most national cost guides use national averages that have little bearing on what you'll actually pay in Llano County, Burnet County, or Travis County's western fringes. Labor markets, granite caliche soil challenges, Hill Country limestone foundations, seasonal hail exposure (peak March–May), and summer construction heat (average highs of 96°F in July–August) all push costs in directions national calculators don't capture. In our 7+ years building across the Hill Country at TMB Construction — formerly Torres Metal Buildings — we've completed room additions, master suite expansions, garage conversions, barndominium additions, and full second-story builds from Kingsland to Georgetown. This guide distills real project data, 2026 material pricing from our supplier network, Burnet County and surrounding county permit fee schedules, and honest labor cost breakdowns so you can plan and budget with confidence. Need a free estimate for your specific project? Call Justin Torres and the TMB team directly at 830-289-3852.