Home Additions & ADU in Forest Hill - One Fixed Price, Permits Handled

Fast, Reliable Home Additions & ADU Across Forest Hill

Adding a detached ADU or a new room addition in Forest Hill runs $45,000 to $130,000 for most projects, and the two things that most affect that number are your foundation and your permit. Forest Hill sits on Blackland Prairie clay that heaves and shrinks with every wet-dry cycle, and the city issues its own permits through its own municipal department, not Fort Worth’s. If you’ve been putting off an addition because you’re not sure where to start, we’ll walk the lot with you, scope the soil, the setbacks, and the permit path, and put every number in writing before you sign anything. Call (877) 610-1318 to schedule a free estimate.

Call (877) 610-1318

Why Barrett & Sons Construction Is Forest Hill’s Preferred Home Additions & ADU Company

We’re not the biggest remodeling outfit in Tarrant County, and that’s the point. Tom Barrett founded this company in 1998, and his sons run the crews. When you call our office, a live person answers, and when we show up to your Forest Hill job site, the name on the truck matches the people holding the hammers. Forest Hill homeowners have dealt with enough contractors who quote one number on the phone and hand them a different bill at the door. Our scope comes in writing, our allowances come in writing, and every change order arrives on paper before a single nail moves.

Forest Hill is a small, independent city completely surrounded by Fort Worth. That creates a particular kind of confusion for regional contractors who assume they can pull a Fort Worth permit and start swinging. They can’t. We know Forest Hill’s permit desk, we know their inspection schedule, and we know that the inspector answers to the city, not to us. That’s how we want it. If something’s not right, we want that inspector catching it before the drywall goes up, not after you’ve written the final check.

We’ve framed additions off Wichita Street, worked through garage conversions in 76119, and pulled permits through Forest Hill’s city hall for homeowners who had already been told by another contractor that the whole process would be “no problem.” The problem showed up when the Fort Worth permit got rejected. We don’t make that mistake.

Our Home Additions & ADU Services in Forest Hill

Every addition we build in Forest Hill starts with the same three questions: what does the clay under the slab say, what does the city permit desk say, and what do the septic and well setbacks say if you’re on acreage. Here are the services we do most often in this city.

ADU Design & Permitting

An accessory dwelling unit in Forest Hill needs a permit from Forest Hill, period. Not Fort Worth, not Tarrant County, not a general contractor who says he’ll “handle it.” We design the ADU to fit your lot’s actual constraints - setbacks from the property line, sewer or septic tie-in points, and the foundation repair scope the clay is going to force - then we pull the permit ourselves and schedule the inspections. You don’t chase paperwork. You don’t sit on hold with a municipal office. We handle the full permit path from submission to sign-off.

New Detached ADU

Building a new detached ADU on a Forest Hill lot usually means grading an open area, running utilities, and setting a foundation that can survive this soil. On a ranch home off Wichita Street, our crew had to scope helical piers before rough-in because the existing slab had heaved so badly. We pulled the permit through Forest Hill’s city hall, got the inspection sign-off from their inspector before closing the walls, and kept the draw schedule on track. A detached ADU in Forest Hill typically runs $90,000 to $220,000 depending on square footage and site work.

Garage Conversion ADU

Converting an attached or detached garage into a living space is often the most affordable ADU path in Forest Hill, running $30,000 to $80,000. But older garages here have a specific failure mode: failing tie beams. On that same Wichita Street project, the owner’s old garage needed a load-bearing header replacement folded into the change order. We caught it during the site walk, not after the walls were open. If you’re converting a garage in Forest Hill, expect us to check the slab, the tie beams, and the door openings before we hand you a number.

Junior ADU & Interior Conversion

A junior ADU - a smaller, attached living space built inside your existing home’s footprint - can be a smart option when Forest Hill’s setback rules or your lot size make a detached unit impractical. We’ve converted spare bedrooms, enclosed patios, and attached garages into JADUs with their own entrances and kitchenettes. The price lands on the lower end of the Home Addition range, often $45,000 to $80,000, depending on plumbing runs and whether we’re working around existing framing or opening walls.

We also handle Home Additions & ADU room additions, second-story additions, and sunrooms across Forest Hill. If you’re not sure which ADU path fits your lot, start with a site walk. We’ll tell you what’s possible, what’s practical, and what the permit desk will actually approve.

Trusted Brands We Service in Forest Hill

We stock and install materials you can look up, not mystery brands off a van. For Forest Hill kitchen and bath work we carry Schluter waterproofing systems and Sterling fixtures, and we’ve installed Schluter’s membrane under tile in more than a few ADU kitchens and baths where the clay movement means every seam has to be right. If your addition includes a roof tie-in, GAF products are on our standard spec sheet. We order local when we can, and if a Forest Hill job needs a warrantied part fast, we don’t make you wait on a supply house across the metro.

Common Home Additions & ADU Problems We See in Forest Hill Homes

Forest Hill’s housing stock is mostly 1950s through 1970s brick ranch homes on slab foundations, and the Blackland Prairie clay under them does not sit still. Here’s what we run into on nearly every addition or ADU project in this city:

• Pulling a Fort Worth permit for a Forest Hill address. Forest Hill is fully incorporated and surrounded by Fort Worth, but it has its own city hall, its own permit desk, and its own inspectors. A Fort Worth permit on a Forest Hill job site stops work cold until the correct paperwork is in hand. We see this happen to regional contractors all the time, and it costs homeowners weeks.
• Heaving slabs and racked door frames. The clay under Forest Hill contracts in droughts and heaves after heavy rain. New additions built on standard slabs without soil correction will crack within the first year. We scope soil tests and foundation repair on the front end because we’ve seen what happens when someone skips it.
• Septic and well setbacks on acreage lots. Not every Forest Hill parcel connects to city sewer and water. Open lots and larger properties often need septic and well setbacks surveyed before anyone can say where an ADU can sit. We survey those before we quote, not after you’ve signed.
• Failing tie beams in older garages. Many Forest Hill garages from the 1960s and 1970s were built with undersized tie beams that sag over time. Converting one into an ADU without addressing the header turns a $45,000 project into a structural problem. We check it during the walkthrough and put it in the change order if it’s needed.

Pricing for Home Additions & ADU in Forest Hill, TX

We Also Serve Cities Near Forest Hill

While this page is focused on Forest Hill, our crews work in the surrounding Tarrant County communities too. We serve Kennedale, Everman, Rendon, and select parts of Fort Worth. If you’re a few minutes down the road and need a Home Addition or ADU, call us - we’ll let you know if we can get eyes on your lot this week.

FAQs - Home Additions & ADU in Forest Hill