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 Royal Palm Beach
Home additions and ADU construction in Royal Palm Beach, FL typically run between $45,000 and $220,000 depending on whether you’re converting a garage, adding a second story, or building a detached unit from the slab up. We work throughout the 33421 zip code and know the Lake Worth Drainage District canal lots, the CBS tract home stock from the 1975-1995 build era, and the post-Hurricane Andrew code upgrades that almost every permit triggers here. Call (877) 610-1318 for a free estimate and we’ll walk your lot before we quote anything.
Why Barrett & Sons Construction Is Royal Palm Beach’s Preferred Home Additions & ADU Company
Tom Barrett started this company in 1998, and he still answers the phone. His sons run the crews that work in Royal Palm Beach, not dispatch strangers from a call center two states away. That’s the difference when you’re spending $90,000 on a detached ADU and you want to know who’s standing in your backyard.
We pull permits on every eligible job in Royal Palm Beach and we get them signed. The permit inspector works for you, not for me, which is why we make sure the Simpson Strong-Tie straps, the impact-rated windows, and the LWDD clearance are all in the file before he shows up. Every price change arrives as a written change order before work proceeds. The allowance that isn’t on paper is a surprise waiting for a date.
Our Home Additions & ADU reputation in Royal Palm Beach comes from doing exactly that. No surprises. No phone quotes that mysteriously grow. Just a written scope, a written allowance schedule, and a 90-Day Done Right Promise on every contract.
Our Home Additions & ADU Services in Royal Palm Beach
We handle the full range of Royal Palm Beach addition work, but in this village four services come up more than any other.
ADU Design & Permitting
Before you even think about pouring concrete in Royal Palm Beach, you need the LWDD right-of-way review cleared. Our team handles the Lake Worth Drainage District paperwork, the village building permit, and the structural drawings as one package. We’ve done enough canal-lot ADUs to know exactly which easement questions trigger a delay and which ones clear in a week.
New Detached ADU
A new detached ADU in Royal Palm Beach starts around $90,000 and runs to $220,000 depending on square footage, finishes, and how much site prep your lot needs. High water table lots near the lateral canals often require additional fill, deeper compaction, and slab elevation adjustments. We price that in writing before you sign, not after the excavation starts.
Garage Conversion ADU
Converting an existing garage runs $30,000 to $80,000 in Royal Palm Beach. Most 1980s-era garages here sit on slabs that were never waterproofed for living space, and the original 100-150A electrical panels rarely support the added load. Budget for panel upgrades, waterproofing, and impact-rated windows. A cheap quote that skips those items stalls at final inspection.
Junior ADU & Interior Conversion
A junior ADU carved out of an existing floor plan is the fastest path to rental income in Royal Palm Beach, but it’s also the easiest place for a contractor to skip the structural review. We tie every interior conversion back to the same code baseline: hurricane straps where the wall is load-bearing, updated window ratings where the opening changes, and a permit file the inspector actually signs.
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 Royal Palm Beach
We install Simonton, PGT, and CGI impact-rated windows and doors on our Royal Palm Beach additions, and we specify them by name in the contract. When you’re paying for wind-load compliance on a 33421 home, the product rating matters as much as the installation. These are brands you can look up, not mystery units off a van. We order direct and schedule delivery around your permit timeline so rough-in inspections don’t wait on materials.
Common Home Additions & ADU Problems We See in Royal Palm Beach Homes
- LWDD easement violations on canal lots. A large share of Royal Palm Beach lots abut LWDD lateral canals. Contractors who don’t pull right-of-way clearance before staking a detached ADU slab trigger stop-work orders that can stall the project for weeks. We pull clearance first, every time.
- 1970s gable-end framing without hurricane bracing. Homes built before the post-Andrew code overhaul often lack the tie-downs a second-story addition requires. Reusing an original load-bearing wall without Simpson Strong-Tie retrofit straps fails structural inspection. We scope the retrofit into the original bid.
- Quotes that omit impact-rated windows and roof decking attachment. A Royal Palm Beach permit for an addition that changes the building envelope triggers compliance upgrades on those openings. Some contractors leave them out to look cheaper. The final sign-off gets withheld until the retrofits are added, and the homeowner pays the difference mid-project.
- Slab water intrusion on high water table lots. Western Palm Beach County sits at the eastern edge of the Everglades water-management system. Afternoon convective storms deliver some of the highest localized rainfall totals in the county. A slab-on-grade addition without proper waterproofing membrane and drainage planning fails here faster than on the coast.
Pricing for Home Additions & ADU in Royal Palm Beach, FL
Here’s what we see in the Royal Palm Beach market right now, based on the projects we’ve quoted across the 33421:
| Project Type | Typical Range in Royal Palm Beach |
|---|---|
| Home Addition | $45,000 - $130,000 |
| ADU Construction | $90,000 - $220,000 |
| Garage Conversion ADU | $30,000 - $80,000 |
What moves the number most in Royal Palm Beach: whether your lot is on a canal and needs LWDD clearance plus fill work, whether your existing panel is 100A or 150A and needs a 200A upgrade, and how many impact-rated openings the permit triggers. We give you a written line-item quote so you see every one of those items before you commit. Call (877) 610-1318 and we’ll schedule the free estimate.
We Also Serve Cities Near Royal Palm Beach
Our crews cover Wellington, The Acreage, West Palm Beach, and West Gate as well as Royal Palm Beach. If you’re a few blocks over the village line, you still get the same written pricing, the same permit accountability, and the same face on the job site. Tom lives twenty minutes away. If something’s wrong, he wants to know about it.
Serving Royal Palm Beach, FL - Our Local Coverage Area
We’re based in the Royal Palm Beach 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 Royal Palm Beach
Yes. Any new structural work in Royal Palm Beach that touches the roof-to-wall connection triggers compliance with the current Florida Building Code, not the code from the year the house was built. A second-story addition on a 1978 CBS home means the tie-downs, gable-end bracing, and roof decking attachment all have to meet post-Andrew standards before the inspector signs off. We scope those retrofits into the bid so you’re not surprised when the structural inspection comes. Call (877) 610-1318 for a quote that includes them.
LWDD controls a right-of-way strip along the lateral canals that run through Royal Palm Beach, and you cannot break ground inside that easement without their written clearance. Even your foundation placement, slab elevation, and drainage plan have to clear their review before the village issues the building permit. We file the LWDD paperwork as part of our ADU design and permitting package so you never hit a stop-work order mid-project.
It often does, because Florida insurers discount documented wind-mitigation upgrades. The key word is documented: the install has to be permitted, inspected, and signed before the carrier will credit it. We use PGT, CGI, and Simonton units with ratings the insurer can verify, and we leave you with the permit file to prove it. Ask your agent for the specific discount, and call us at (877) 610-1318 for the window quote.
The 1975-1995 Royal Palm Beach housing stock was built with 100-150A panels that were sized for the electrical loads of that era. Adding a living unit with a mini-split, range, water heater, and laundry circuits routinely exceeds the remaining capacity, and the inspector won’t sign the panel as-is. We include the 200A upgrade in our garage conversion ADU pricing up front. A bid that omits it is a change order waiting to happen.
Slab-on-grade additions in Royal Palm Beach need a vapor retarder under the slab, a perimeter drainage plan that moves water away from the foundation, and often raised slab elevation on the lower canal lots. The high seasonal water table and the heavy afternoon convective storms from the Everglades make any skipped step show up fast as slab moisture and flooring failure. We specify the membrane and drainage in the written scope, not as an afterthought. Call (877) 610-1318 for a free estimate with the waterproofing written in.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Royal Palm Beach and the surrounding communities.
Contact Barrett & Sons Construction
If you’re planning a home addition or ADU in Royal Palm Beach, call (877) 610-1318 for a free estimate. A live person answers, 24/7. We’ll walk your lot, check the LWDD easement, review your panel and existing framing, and hand you a written line-item quote with every permit upgrade included. No surprises, no fuzzy allowances, no change orders you didn’t sign first.