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 North Palm Beach
Home additions in North Palm Beach run $45,000-$130,000 for a coastal-spec build, and detached ADUs typically land between $90,000 and $220,000 once flood-zone compliance and impact-rated openings are counted. Those numbers are honest, and they’re higher than inland Palm Beach County quotes for a reason we’ll explain below. If you’re planning a second story, a garage conversion, or a new detached ADU in the 33408 ZIP code, call us at (877) 610-1318. We’ll walk your lot, look at your existing slab and roof connections, and give you a written line-item estimate before you sign anything.
We’re Barrett & Sons Construction, and our Home Additions & ADU crew works throughout North Palm Beach from Lighthouse Drive to the finger canals off Prosperity Farms Road. This is a village where the building code, the salt air, and the 1960s housing stock all collide, and we’ve learned exactly which corners you can’t cut here.
Why Barrett & Sons Construction Is North Palm Beach’s Preferred Home Additions & ADU Company
Tom Barrett founded this company in 1998, and his sons run the crews that show up on North Palm Beach job sites. We’re not a franchise dispatching strangers. When you call, a live person answers, and when you have a question about your ADU rough-in or your second-story shear wall, you talk to someone who’s been on your street, not a call center in another state.
North Palm Beach homeowners tend to be repeat customers and referrals. The village is small enough that a contractor’s reputation travels fast, and ours is built on written change orders, permits pulled on every eligible job, and the 90-Day Done Right Promise that’s written into every contract. If something isn’t right after we finish, one call brings Tom back.
We also know this village’s specific pain points. The original canal-front homes along Lighthouse Drive and Waterway Court were built on fill lots with shallow footings. The 1960s and 70s ranch houses on the interior streets have original jalousie windows and 100-amp panels. The salt air off Lake Worth Lagoon eats standard galvanized hardware faster than most homeowners realize. We price all of that upfront. No surprises, no allowance that isn’t on paper, and no permit inspector surprises because we file for what we build.
Our Home Additions & ADU Services in North Palm Beach
ADU Design & Permitting
North Palm Beach sits almost entirely within Palm Beach County’s high-velocity hurricane zone and flood-zone elevation overlay. Every permitted ADU has to meet 170+ mph uplift ratings and corrosion-resistant material specs that inland jobs don’t. We handle the full design and permitting package, including the geotechnical report when your lot sits on the village’s finger-canal fill. The permit inspector works for you, not for me. That’s why I like him.
Garage Conversion ADU
Converting an attached garage is usually the most cost-effective path to an ADU in North Palm Beach, but it’s not a simple drywall job. The existing CBS walls were built before modern hurricane tie-down requirements, and the roof-to-wall connections often need retrofitting with hot-dip galvanized clips. We also flag the electrical early: adding a permitted bedroom to a 1960s-era panel usually triggers an upgrade under Palm Beach County’s substantial-improvement rules. You’ll see that as a line item, not a mid-project surprise.
New Detached ADU
A new detached ADU in North Palm Beach runs $90,000-$220,000, and the flood-zone elevation and impact-opening requirements drive a good portion of that. We’re experienced with the specific foundation realities on canal-front fill lots. Shallow 1960s fill can settle and crack a new slab within two years, so we routinely recommend helical piers or a grade beam on waterfront parcels. The cheap bid doesn’t include that geotechnical work, and it shows up later as cracked door frames and a subfloor that’s no longer level.
Junior ADU & Interior Conversion
For homeowners who want rental income or a multi-generational setup without the full detached build, a junior ADU carved from an existing garage, sunroom, or underused interior space often makes sense. In North Palm Beach, the trigger point is usually egress and impact glazing: a new bedroom means the old jalousie windows have to go, replaced by impact-rated aluminum or vinyl that meets current code. We quote that replacement as part of the original scope, not as a change order after the rough-in passes.
What happens when you call
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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.
Pricing for Home Additions & ADU in North Palm Beach, FL
Let’s be straight about the numbers. A coastal-spec home addition in North Palm Beach runs $45,000-$130,000. A detached, flood-zone-compliant ADU runs $90,000-$220,000. Impact windows for the new envelope run $8,000-$25,000 depending on opening count and size. The gap between these numbers and an inland Palm Beach County quote isn’t contractor markup. It’s stainless steel anchors instead of standard galvanized, impact-rated openings instead of builder-grade glazing, helical piers instead of a standard slab, and hot-dip galvanized hurricane clips instead of whatever was cheapest at the supply house.
| Scope | North Palm Beach Price Range |
|---|---|
| Home Addition (coastal-spec, stainless hardware, impact openings) | $45,000-$130,000 |
| ADU Construction (detached, flood-zone compliant) | $90,000-$220,000 |
| Impact Window Installation (addition or ADU envelope) | $8,000-$25,000 |
Every estimate we write for North Palm Beach is a line-item document. You’ll see exactly what the coastal-spec version costs versus the inland-spec version, and you can compare bids without guessing. Call (877) 610-1318 and we’ll put one together for your specific lot and floor plan.
Common Home Additions & ADU Problems We See in North Palm Beach Homes
- Rusted roof fasteners on original CBS construction. On a canal-front ranch along Lighthouse Drive, our crew opened a 1966 exterior wall for a garage-to-ADU conversion and found the original roof fasteners rusted to half their diameter from decades of salt air off Lake Worth Lagoon. We replaced every roof-to-wall connection with hot-dip galvanized hurricane clips and spec’d stainless anchors for the new load-bearing beam. Ten miles inland, standard galvanized would have saved $6,000. Here, it would’ve failed a punch-list inspection within eight years.
- Undersized electrical panels triggering substantial-improvement upgrades. Most 1960s and 70s North Palm Beach homes still have 100-amp panels. Add a permitted bedroom or ADU and Palm Beach County’s substantial-improvement rule forces a panel replacement and arc-fault breakers mid-project. It’s not an option. We include it in the original quote.
- Settling fill lots on the finger canals. The original canal-front homes were built on shallow fill that predates modern soil-bearing requirements. Pour a new slab without a geotechnical report and you’ll see settling cracks within two years. We require the report and spec helical piers or a grade beam on waterfront parcels.
- Jalousie windows blocking final inspection. Those original jalousie windows are charming, but they’re nowhere near current impact-resistance code. Add a bedroom or convert a garage to living space and they have to be replaced with impact-rated units. We quote the full replacement upfront so it doesn’t arrive as a change order.
Trusted Brands We Service in North Palm Beach
We don’t install mystery materials off a random supply truck. On North Palm Beach jobs, we’re regularly installing Techo-Bloc or Belgard pavers for patios and walkways, Cambridge or Oldcastle products when site prep calls for modular block, and Quikrete bagged mixes for smaller ADU slab pours and fence post footings. These are brands you can look up, with published specs, and they hold up to the salt air and humidity in the Intracoastal corridor. We keep local inventory at our South Florida yard, so North Palm Beach customers aren’t waiting on material deliveries from upstate.
We Also Serve Cities Near North Palm Beach
Our crews work regularly in Lake Park, Riviera Beach, Palm Beach Gardens, and Palm Beach. If you’re just outside the village line, the same coastal-spec pricing logic applies, and we’ll still pull your permits and write every change order before work moves. Call (877) 610-1318.
Serving North Palm Beach, FL - Our Local Coverage Area
We’re based in the North 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 North Palm Beach
Many of the original canal-front homes in North Palm Beach sit on shallow fill lots with footings that predate modern soil-bearing requirements. Adding a second story changes the load path, and without a geotechnical report you’re guessing whether the existing footing can carry it. On waterfront lots, we routinely specify helical piers or a grade beam based on that report. The $2,500-$5,000 report is cheap compared to a structural settlement issue that shows up after framing is done. Call (877) 610-1318 and we’ll schedule one with an engineer who knows this village’s soil profile.
On a typical detached ADU in North Palm Beach, the coastal-spec premium runs roughly $15,000-$30,000 over an inland build. That covers hot-dip galvanized hurricane clips instead of standard galvanized, stainless steel anchors at load-bearing connections, impact-rated windows and doors instead of builder-grade glazing, and flood-zone-compliant foundation work. The cheap inland spec saves money on day one and costs more within a decade: rusted fasteners fail County uplift inspections, and impact-rated replacements on resale cost double the original upgrade. We show both numbers on every estimate so you can decide with your eyes open.
Yes, in most cases you can convert an attached garage without lifting the house. The garage slab usually stays as-is unless you’re changing the floor elevation. The real work is in the walls and roof: existing roof-to-wall connections need retrofitted hurricane clips, the jalousie windows get swapped for impact-rated units, and the electrical panel upgrade gets triggered by the new bedroom classification. The structural beam over the garage door opening also usually needs replacing with a properly specced lintel. Get a contractor to walk it before you commit to a number. Estimates are free at (877) 610-1318.
Jalousie windows are not impact-rated and they don’t meet current Florida Building Code requirements for new habitable space. When you add a bedroom or convert a garage to living space, the County requires impact-rated openings. You can’t grandfather them in when the scope crosses the substantial-improvement threshold. We quote the window replacement as part of the original addition scope, so you’re not surprised by it after the rough-in passes.
The electrical panel upgrade is the one that catches most North Palm Beach homeowners off guard. The original 100-amp panels in these 1960s and 70s ranch homes can’t carry the added load of a new bedroom or ADU, and Palm Beach County’s substantial-improvement rule mandates a panel replacement and arc-fault breakers. It’s a $3,000-$6,000 line item that a sloppy bid leaves out. Our estimates include it whenever the scope triggers it. That’s the difference between a written change order and a surprise invoice. Call (877) 610-1318 for a line-item quote.
Get Your Free North Palm Beach Home Addition Estimate
If you’re planning a home addition, second story, garage conversion, or new ADU in North Palm Beach, call us at (877) 610-1318. We’ll schedule a walk of your lot, look at your existing footings, roof connections, and panel, and put together a written line-item estimate that shows you the coastal-spec numbers. Tom Barrett’s name, address, and license number are published and verifiable. Look us up before you sign anything.
Written by Tom Barrett, Owner at Barrett & Sons Construction, founded 1998.