Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
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AfterFast, Reliable Home Additions & ADU Across The Acreage
A home addition or ADU in The Acreage typically runs $45,000 to $130,000 for a standard room addition, with detached ADUs landing between $90,000 and $220,000 depending on septic capacity, ITID drainage requirements, and the finish level you choose. That’s the honest range before we walk your lot. The Acreage isn’t Royal Palm Beach or Wellington, and the price difference comes down to one thing: you’re on private well and septic, with the Indian Trail Improvement District watching every culvert and swale. We’ve built additions out here long enough to know that the site work is where the real cost hides. Call (877) 610-1318 and we’ll come walk your parcel, not work off a satellite photo.
Why Barrett & Sons Construction Is The Acreage’s Preferred Home Additions & ADU Company
We’re the owner-operated outfit that pulls permits before the first stake goes in the ground. Tom Barrett put his name on the truck in 1998, and his sons run the crews, including the ones that work The Acreage. When a homeowner on 60th Street North calls about adding a mother-in-law suite, the person who answers the phone is someone who has actually bent conduit in this soil.
What sets us apart out here is simple: every change order is written before the work happens, and every permit goes through ITID and Palm Beach County the right way. We don’t treat The Acreage like a suburb. We know the Health Department wants to see your septic plan before they’ll sign off on a detached ADU. We know the culvert permit can take three weeks. We plan around it, not through it.
Our 90-Day Done Right Promise is written on every contract. If something isn’t done right, Tom comes back. One call. That’s the whole promise, and it’s the reason homeowners in The Acreage keep our number in their phones. Home Additions & ADU work is what we do, and we do it without surprise invoices at the end.
Our Home Additions & ADU Services in The Acreage
ADU Design & Permitting
On a 1.25-acre lot in The Acreage, a detached ADU isn’t just a small house. It’s a second septic connection or a drain field expansion, a well capacity check, and an ITID review of any new driveway approach. We handle the design and the permitting as one package, so the Health Department, the ITID, and Palm Beach County all see the same plan at the same time. That keeps your build from stalling at the final inspection.
Garage Conversion ADU
Converting an attached garage in The Acreage usually runs $30,000 to $80,000, and the septic question still comes up. If your existing drain field is sized for a three-bedroom house, adding a full kitchen and bath to the garage can push you past capacity. We check that before we frame the first wall. Older CBS garage slabs in the area may also need crack and settlement review, because the muck soil under The Acreage moves more than people expect.
New Detached ADU
A new detached ADU in The Acreage typically lands between $90,000 and $220,000. The spread comes from site conditions: water table depth, drain field location, how far the ADU sits from the main structure, and whether the ITID requires a new culvert for the secondary driveway. We engineer for the wet season, which means elevated slab design and Storm-rated ties and anchors. This is not a spec-house build. It’s your lot, your well, your septic, and your family.
Junior ADU & Interior Conversion
For homeowners who want living space inside the existing footprint, a junior ADU or interior conversion is often the cleanest route. In The Acreage, this usually means converting part of an oversized CBS home built in the 1980s or 1990s. You avoid the ITID culvert process entirely, and as long as the existing septic can handle one more bedroom, permits move faster. We still pull them. The permit inspector works for you, not for me, which is why Tom likes him there.
ADU Site Prep & Utilities
This is the part most out-of-area contractors underestimate in The Acreage. Private well expansion, drain field relocation, elevated slab fill, and ITID swale coordination all happen before any framing. We’ve done enough of these to know the soil: peat and muck in pockets, high water table 18 to 24 inches below grade in wet season, and shifting fill from original 1980s grading. We build for that. If your contractor’s price doesn’t include a Health Department septic permit line, you’re going to find out later. We put it in the written scope from day one.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in The Acreage
For site work and hardscape around your new addition or ADU, we carry brands you can look up before you sign: Techo-Bloc and Cambridge Pavers for patios and walkways, and Quikrete products for slab and stem-wall work. We don’t use mystery materials off a van. On The Acreage’s muck soil, the difference between a properly restrained paver edge and an inland-standard sand base is the difference between flat and trip hazard after one wet season. We specify the right one for your lot, not the one that’s easiest to quote over the phone.
Common Home Additions & ADU Problems We See in The Acreage Homes
- Rust bleeding through stucco at the gable ends. Contractors using electro-galvanized strapping instead of hot-dip galvanized hurricane ties save a few hundred dollars on the front end. Within four wet seasons, red streaks bleed through the stucco. We use hot-dip galvanized or 316 stainless on every roof-to-wall connection.
- Slab settlement on original 1980s footings. Older CBS homes in The Acreage were often built before the water table’s seasonal swing was fully engineered for. We inspect the existing slab and stem walls before tying a room addition into them. Adding square footage to a settling foundation is how you get diagonal cracks through the new drywall.
- ITID culvert permit delays stop the final inspection. Any project that touches or crosses a roadside swale needs an ITID right-of-way permit before Palm Beach County will close out the building permit. Out-of-area contractors discover this at the worst possible moment: the building is done, but there is no certificate of occupancy. We pull the ITID permit early.
- Drain field capacity overlooked on garage conversions. A garage conversion with a full bath and kitchen adds a bedroom-plus load to the septic system. If the drain field is already at capacity, the Health Department will not sign off. We check the existing septic permit before we start, and we tell you what the expansion costs before you’re committed.
Pricing for Home Additions & ADU in The Acreage, FL
Here’s the honest picture for The Acreage, FL pricing. A standard room addition on a CBS home runs $45,000 to $130,000. A new detached ADU spans $90,000 to $220,000, driven by septic expansion, well capacity, elevated slab engineering, and ITID requirements. A garage conversion ADU sits between $30,000 and $80,000, depending on whether your existing septic can carry the extra load. These aren’t national averages. They’re calibrated for The Acreage’s large-lot, private-well, private-septic reality.
| Project Type | Price Range in The Acreage |
|---|---|
| Home Addition | $45,000 - $130,000 |
| ADU Construction | $90,000 - $220,000 |
| Garage Conversion | $30,000 - $80,000 |
What moves the number most: whether the Health Department requires a larger drain field, whether the ITID wants a new culvert for a widened driveway approach, and whether the existing slab can take the addition without new footers. We put every allowance in writing before framing starts. An allowance that isn’t on paper is a surprise waiting for a date. Call (877) 610-1318 for exact numbers on your lot. Estimates are free.
We Also Serve Cities Near The Acreage
Our crews work throughout western Palm Beach County. You’ll find us on jobs in Royal Palm Beach, Palm Beach Gardens, Wellington, and Lake Park, and we’re glad to come out to your place anywhere near The Acreage. Same owner-operated crews, same written change orders, same 90-Day Done Right Promise whether you’re on city water or private well.
Serving The Acreage, FL - Our Local Coverage Area
We’re based in the The Acreage 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 The Acreage
The Indian Trail Improvement District reviews and permits any work that touches or crosses a roadside swale, drainage canal, or right-of-way, which means a widened driveway approach for your new ADU can add roughly three weeks to your timeline, and Palm Beach County will not close out your final inspection without the ITID sign-off. We submit the ITID application alongside the county building permit so the two processes run in parallel, not in sequence. Call (877) 610-1318 and we’ll map out your specific timeline.
A detached ADU with a bathroom and kitchen adds a bedroom-equivalent load to your drain field, so the Health Department will review your existing septic permit and may require expanding the drain field or adding a second tank, which can consume several hundred square feet of usable lot space. We pull the septic permit as part of the ADU package. That’s a written line item from the first estimate, not a surprise after demo starts.
For a room addition in The Acreage’s humid, salt-tinged air, aluminum and fiberglass frames with stainless or hot-dip galvanized hardware outlast vinyl frames, which can warp and gasket-fail after repeated wet seasons and high UV exposure. We specify Andersen or Marvin frames with non-corrosive hardware as standard. The coastal-spec window costs more up front and costs less over a decade.
Because the ITID right-of-way permit covers the swale crossing and culvert structure itself, and when your addition or ADU changes the driveway’s width, grade, or drainage pattern, the district requires a review and often a new culvert extension before the county will finalize the building permit. This is a fee many out-of-area contractors don’t know to include. It’s in our written scope before we start, and you’ll see the permit pulled before framing begins.
On The Acreage, a stem-wall addition is usually worth it because your site sits on muck and peat soil with a water table that rises close to grade during the June-to-October wet season, and a monolithic slab without proper elevation and muck removal can crack within a few years. We evaluate the existing soil borings and the Palm Beach County flood elevation certificate before we recommend a foundation. That evaluation is part of the free estimate, not an add-on later.
Call Barrett & Sons Construction for Home Additions & ADU in The Acreage
If you’re planning a room addition, a detached ADU, or a garage conversion on your The Acreage lot, call (877) 610-1318 and Tom or one of his sons will answer. We’ll walk your parcel, review your septic and well capacity, map the ITID process, and give you a written scope with every allowance named. The estimate is free, the change orders are written, and the 90-Day Done Right Promise is on the contract. You’ll see our name on the truck, and you’ll see Tom at the hardware store. That’s how we’ve done it since 1998.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving The Acreage and western Palm Beach County.