Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
Before
After
Before
After
Before
AfterFast, Reliable Home Additions & ADU Across Eagle Mountain
Adding a room or building an ADU in Eagle Mountain typically runs $45,000-$130,000 for an addition and $90,000-$220,000 for a detached ADU, with garage conversions landing between $30,000 and $80,000. That’s the honest range we quote folks around the lake, and we stand behind it with written change orders before any scope shift touches the job. Eagle Mountain is a different animal from Fort Worth proper, and we treat it that way. Call (877) 610-1318 and you’ll get a live person, not a voicemail box.
Why Barrett & Sons Construction Is Eagle Mountain’s Preferred Home Additions & ADU Company
Tom Barrett started this company in 1998, and his sons run the crews. When we take on a Home Additions & ADU project in Eagle Mountain, the name on the truck matches the people swinging hammers. That matters here because Eagle Mountain isn’t a drive-through suburb. It’s a lake community with unincorporated pockets, older cabin stock, and a permitting layer most contractors haven’t dealt with until it bites them.
We’ve walked enough Eagle Mountain lots to know the difference between a 1960s pier-and-beam cabin off Ten Mile Bridge Road and a 2005 tract home near the 76179 inland neighborhoods. Reviews from local homeowners keep mentioning the same things: the written estimates hold, the crew shows up when they say they will, and Tom answers his own phone. That last part isn’t marketing. It’s how we’ve operated for 29 years.
Our Home Additions & ADU Services in Eagle Mountain
ADU Design & Permitting
Eagle Mountain’s dual-permitting reality means an ADU project doesn’t start with a sketch; it starts with the right paperwork. Tarrant County development permits are step one, but any structure within the Trinity River Authority’s flood influence zone also needs TRA easement and setback approvals. We handle both, and we tell you exactly what each authority requires before you spend a dollar on design.
Garage Conversion ADU
Garage conversions are the most common ADU request we hear from Eagle Mountain homeowners, mostly because they work within an existing footprint. Costs here run $30,000-$80,000 depending on whether the garage has its own electrical panel or needs an upgrade. Many of the older lake-area garages were built for weekend storage, not plumbing and insulation, so we budget for utility upgrades from day one.
New Detached ADU
A new detached ADU in Eagle Mountain runs $90,000-$220,000. The wide range comes down to site prep, foundation type, and where the structure sits relative to the lake’s floodplain fingers. On clay-heavy Tarrant County soil with aggressive expand-and-contract cycles, we spec post-tension slabs and get geotech input early. Cutting that corner is how you end up with a broken slab in three years.
Junior ADU & Interior Conversion
For Eagle Mountain homes with a spare bedroom, den, or walkout space, a junior ADU or interior conversion often delivers rental income or a multigenerational suite at a fraction of new construction cost. These projects typically land in the $45,000-$80,000 range depending on whether a separate entrance is feasible. Some of the older lake cabins have layouts that convert cleanly; some don’t, and we’ll tell you which one you’re looking at.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Eagle Mountain
We carry and install brands you can look up before you sign anything. For bathroom work inside an ADU or addition, that means Schluter waterproofing systems, Sterling fixtures, and Grohe hardware where the budget calls for it. For our Roofing in Eagle Mountain on a new addition or full replacement, we use GAF. No mystery materials off the back of a van. If it’s going into your Eagle Mountain project, the brand name is on the contract.
Common Home Additions & ADU Problems We See in Eagle Mountain Homes
- TRA easement surprises. The Trinity River Authority holds shoreline easements running 50-100 feet inland around Eagle Mountain Lake. We’ve seen finished structures ordered into partial demolition because a contractor pulled only a county permit and skipped TRA coordination. We coordinate both before ground breaks.
- Undersized utilities on old cabin lots. The original 1950s-1970s seasonal cabins around the lake often run on electrical panels and septic systems sized for weekend use. When those become full-time homes with an ADU, the load demand jumps. We include utility evaluation in every Eagle Mountain addition scope.
- Clay soil movement. Northwest Tarrant County clay expands and contracts hard through drought-and-rain cycles. A standard slab that works fine in Saginaw can crack in Eagle Mountain if the post-tension specs aren’t dialed for local soil conditions. We specify for this ground, not a generic handbook.
- Non-code-compliant prior additions. Because Eagle Mountain sits unincorporated, older additions sometimes went up without permits or inspections. Any new addition has to account for what’s already there, and we don’t build on top of a problem without flagging it in writing.
Pricing for Home Additions & ADU in Eagle Mountain, TX
A room addition in Eagle Mountain runs $45,000-$130,000. That covers everything from a 200-square-foot bump-out to a second-story addition, with the spread driven by footprint, foundation work, and utility upgrades. Garage conversions land at $30,000-$80,000. New detached ADUs start around $90,000 and can reach $220,000 for a fully finished unit with separate utilities. Junior ADUs and interior conversions typically fall between $45,000 and $80,000. The permit layer here, county plus TRA, adds cost and time compared to Saginaw or Azle, but skipping it costs far more later. We write every allowance and line item on paper. Call (877) 610-1318 for a free estimate, and you’ll get all of it in writing.
We Also Serve Cities Near Eagle Mountain
If you live just outside Eagle Mountain in Saginaw, Azle, Briar, or River Oaks, the same crew and the same written-pricing promise apply. We regularly work the whole northwest corner of Tarrant County. See Home Additions & ADU in Eagle Mountain for the full local picture, and if your project overlaps with an interior remodel, we also handle Bathroom Remodeling in Eagle Mountain.
Serving Eagle Mountain, TX - Our Local Coverage Area
We’re based in the Eagle Mountain area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs - Home Additions & ADU in Eagle Mountain
A home addition in Eagle Mountain runs $45,000-$130,000, with the final number set by square footage, foundation requirements, and whether you’re working within the TRA flood influence zone. Call (877) 610-1318 and we’ll put a line-item estimate in front of you at no charge.
Yes, every eligible Eagle Mountain project includes Tarrant County development permits and Trinity River Authority easement coordination where the property falls within the lake’s flood influence zone. We never tell a customer that permits are optional. That’s how people end up with a structure facing partial demolition.
Yes, garage conversions are our most requested ADU type in Eagle Mountain, typically running $30,000-$80,000. The work depends on your garage’s existing electrical, insulation, and foundation condition. Call (877) 610-1318 to schedule a free estimate and we’ll tell you what your specific garage can support.
A standard room addition in Eagle Mountain takes 3-6 months from permit approval to final inspection, while a detached ADU runs 6-10 months. The county and TRA permitting steps add lead time here that you won’t see in Saginaw or River Oaks. We give you a written timeline before work starts, and change orders if anything shifts.
Yes, every completed Barrett & Sons job in Eagle Mountain carries the written 90-Day Done Right Promise, and if something isn’t right, one call brings Tom back to make it right. That’s on every contract. Call (877) 610-1318 to talk it through.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Eagle Mountain and northwest Tarrant County since 1998.