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ADU construction in West Palm Beach typically costs between $90,000 and $220,000 for a finished accessory dwelling unit in 2026. Most detached one-bedroom ADUs in neighborhoods like Flamingo Park, Grandview Heights, and Southland Park land between $110,000 and $165,000, while garage conversions trend slightly lower, from $90,000 to $130,000. These are real, buildable numbers for this market – not placeholder ranges you’d see on a national lead-gen site.
We’re Bradford Remodeling Co West Palm Beach, led by Curtis Lane. We build ADUs under The Garrison Standard, which means one thing for pricing: you get a written number before a single tool comes out of the truck. That number does not move at the door.
ADU Construction Cost Breakdown (2026)
Here’s how the $90,000 to $220,000 range breaks down by scope and type. These figures reflect what we quote and what competing bids in Palm Beach County are running in 2026.
| ADU Type | Typical Price Range | What You’re Getting |
|---|---|---|
| Garage Conversion (attached) | $90,000 – $130,000 | Converted existing garage with finished interior, plumbing rough-in, mini-split HVAC, separate entrance |
| Garage Conversion (detached) | $100,000 – $145,000 | Standalone garage converted to dwelling with upgraded electrical panel tie-in and foundation review |
| Detached 1-Bed / 1-Bath ADU (new build, 400 – 500 sq ft) | $110,000 – $165,000 | Stick-built, slab-on-grade, full kitchen and bath, standard finishes |
| Detached 2-Bed / 1-Bath ADU (new build, 600 – 750 sq ft) | $150,000 – $200,000 | Larger footprint, additional bedroom, upgraded electrical service where needed |
| Detached 2-Bed / 2-Bath ADU (new build, 750 – 1,000 sq ft) | $180,000 – $220,000 | Full-size unit with laundry hookups, higher-capacity HVAC, premium finishes |
On a per-square-foot basis, West Palm Beach ADUs are running between $220 and $340 per square foot for new detached construction. Garage conversions pencil out lower per square foot because the shell already exists – you’re not paying for foundation, framing, and roofing you already own.
What Drives Cost Up or Down
- Foundation type. Slab-on-grade is standard and most affordable. If your lot requires elevated construction or deep footings because of the water table in lower-lying neighborhoods near the Intracoastal, you’ll add $15,000 to $30,000.
- Kitchen finish level. A galley kitchen with KraftMaid cabinets and laminate counters keeps costs down. Cambria or Caesarstone surfaces, a full appliance package, and custom cabinetry add $8,000 to $18,000 to the line item.
- Electrical panel capacity. Many older West Palm Beach homes have 100-amp panels. If your ADU requires a 200-amp service upgrade, budget $3,000 to $5,500 for that work before the ADU itself starts.
- Impact-rated windows and doors. Palm Beach County building code requires wind-mitigation compliance across the county. Impact windows run $8,000 to $15,000 for a typical ADU depending on opening sizes.
- Site access and demolition. Tight lots in Historic Grandview Heights or El Cid where a dumpster and framing crew can’t park next to the structure will push labor costs up 10 to 15 percent.
What Affects ADU Construction Pricing in West Palm Beach
- City of West Palm Beach permitting and impact fees. The city’s building department charges plan review, permit, and impact fees that typically land between $6,000 and $12,000 for an ADU depending on square footage and whether it’s new construction or a conversion. In the incorporated city limits you’ll also deal with zoning verification through the Development Services Department before plans are accepted.
- FEMA flood zone requirements. A meaningful portion of West Palm Beach sits in AE and VE flood zones. If your ADU’s finished floor elevation must be raised to meet FEMA and city code, that’s a real line item – typically $10,000 to $25,000 for fill, stem walls, or piers depending on how many feet of elevation is required.
- Hurricane hardening. This is South Florida. Roof tie-downs, impact glazing, and rated garage doors are not optional upgrades here. Every ADU we build in West Palm Beach includes wind-mitigation details as a matter of code compliance, not an upsell.
- Soil and site conditions. Sandy soils near the coast drain well, but muck and organic layers in western sections of the city can require over-excavation and structural fill. A geotechnical report runs $2,500 to $4,500, and remediation work if needed adds $5,000 to $15,000.
- Utility connections and sewer lateral capacity. If your main sewer line is cast iron from the 1950s and the ADU connects to it, the city inspector is going to flag it. Budget $4,000 to $9,000 to replace or line the lateral when you’re already trenching.
- Finish package choices. There’s a $40,000 difference between a builder-grade ADU and one finished with Wellborn cabinetry, Kohler fixtures, and stone surfaces. We document every material on the written scope so you know exactly which side of that spread you’re on before we start.
Key Takeaways: West Palm Beach ADU Pricing
- Plan for $90,000 to $220,000 total, with most projects in the $110,000 to $165,000 range.
- Garage conversions run $90,000 to $130,000 – the most affordable path to an ADU if you have an existing garage.
- New detached construction costs $220 to $340 per square foot depending on finish level and site conditions.
- West Palm Beach-specific costs include city impact fees ($6,000 to $12,000), FEMA elevation requirements where applicable, and impact-rated openings.
- Bradford Remodeling gives every ADU client a written price before work starts – no numbers that change when the crew shows up.
ADU Types and What They Cost in West Palm Beach
Palm Beach County and the City of West Palm Beach recognize a few distinct ADU configurations. Each carries a different price profile, and the zoning on your specific lot determines which paths are open to you.
Attached ADUs (Addition or Conversion)
An attached ADU shares a wall with the primary residence, typically built as a home addition with a separate entrance, kitchenette, and bath. In West Palm Beach, this route usually runs $90,000 to $160,000. It’s cheaper than a full detached build because you’re sharing roof structure and at least one existing wall line, and your electrical tie-in is simpler. The trade-off: privacy is tighter, and the city still requires the same fire separation and sound attenuation details.
Detached ADUs (New Build)
A detached ADU sits in the rear yard with its own foundation, four walls, and roof system. This is the $110,000 to $220,000 category. You’re paying for the full building envelope, a standalone electrical subpanel, and usually a dedicated mini-split HVAC system. On the plus side, you can orient the unit for better light and separation from the main house, which matters for rental appeal in the West Palm Beach market.
Garage Conversions
In older West Palm Beach neighborhoods – Grandview Heights, Flamingo Park, Pineapple Park – detached garages are common and often underused. Converting one to an ADU runs $90,000 to $145,000. The existing slab, walls, and roof line are a major head start. What you will pay for: cutting new window and door openings, upgrading the slab if it’s cracked or too thin for habitable use, insulating, and running a new sewer branch. Not every old garage qualifies, and the condition of the slab is the first thing we check.
How to Save on ADU Construction
Saving money on an ADU in West Palm Beach is less about cutting corners and more about making decisions before the permit drawings are final. Change orders are the number one budget killer we see. Every change after plans are approved costs you in re-permitting time and labor.
Here’s what actually moves the needle:
- Convert instead of building new when you can. An attached garage with a sound slab and good roof structure saves you $20,000 to $40,000 compared to a detached new build.
- Keep the footprint within standard dimensions. Once you cross 600 square feet, systems scale up – HVAC capacity, panel load, roof framing – and the per-square-foot price doesn’t drop as fast as you’d think.
- Choose finish packages early. We can spec KraftMaid cabinets and a standard countertop at a hard number, or Wellborn and Caesarstone at a higher one. Deciding in week one means we buy right, and we pass the planning discipline to you in the written price.
- Phase what you can phase. Trim items like custom closet systems, upgraded lighting packages, and landscape tie-ins can be added after the certificate of occupancy without triggering a permit revision. We’ll tell you which items fall into that category.
- Get a real estimate, not a guess. Call us at (728) 203-9809 and we’ll give you a free, written estimate with line-item pricing. No obligation, no sales pressure. We price the job so you can plan around a real number.
Is It Cheaper to Build an ADU or Add On to the House?
In West Palm Beach, an ADU is typically cheaper per square foot than a comparable home addition. Home additions in this market run $45,000 to $130,000 for smaller bump-outs, but a full addition with kitchen or bath touches $180 to $300 per square foot – close to ADU pricing, but with the added complexity of tying into the existing roofline and matching existing finishes. An ADU gets its own simple roofline, its own systems, and the construction doesn’t disrupt your living space for six months. For homeowners deciding between the two, the ADU wins on cost predictability and construction speed in most West Palm Beach lots.
Our ADU construction services in West Palm Beach cover both paths. We’ll walk the lot, check the zoning, and tell you honestly which option makes sense before any commitment.
What Does the City of West Palm Beach Require for an ADU?
City permitting is the second-biggest cost driver after scope itself, and it’s where many homeowners get surprised. Here’s what we handle as part of every Bradford ADU project, and what it costs you:
- Zoning verification and site plan review. The city’s Development Services Department confirms setback compliance, lot coverage ratios, and the ADU designation. Expect filing and review fees in the $800 to $1,800 range depending on the specifics of your lot.
- Impact and utility connection fees. Water and sewer connection charges for a new ADU in West Palm Beach run $3,000 to $7,000 depending on meter size and whether the city requires a separate meter head.
- School and road impact fees. Palm Beach County charges impact fees even on ADUs in some circumstances. Park, school, and road assessments can add $2,000 to $5,000.
- Building permit fees. Calculated on project valuation, typically $2,500 to $6,000 for most ADUs in the city.
All of it goes on the written estimate before you sign. When we say written price before work starts, that includes the permit fees – not an estimate that says “fees are extra.”
How Long Does ADU Construction Take in West Palm Beach?
Plan on 6 to 12 months from the day we sign the contract to the day you have a certificate of occupancy. That includes:
- Architectural and structural drawings: 3 to 6 weeks
- City plan review and permit issuance: 6 to 14 weeks – West Palm Beach’s Development Services Department runs slower during the fall and winter when permit volume spikes
- Construction: 4 to 7 months depending on scope, weather, and inspection scheduling
- Final inspections and CO: 2 to 4 weeks
Garage conversions run on the shorter end, 6 to 9 months total. A detached 2-bedroom with custom finishes runs the longer end. We put the schedule in the written scope and update it weekly. Curtis Lane reviews every project timeline personally before the crew starts.
Why ADU Costs Are Higher in West Palm Beach Than Much of Florida
If you compare our $220 to $340 per square foot to what your cousin in Ocala paid, yes – it’s higher here. That’s not contractor markup; it’s the cost of building a safe structure in a hurricane zone with elevated code requirements.
Wind-mitigation hardware, impact-rated openings, and stricter tie-down schedules add 8 to 15 percent to framing and fenestration costs compared to inland Florida. Flood zone elevation requirements in some West Palm Beach neighborhoods add foundation cost that simply doesn’t exist in non-coastal markets. And the city’s permitting cycle, while faster than Miami-Dade’s, still adds carrying cost on the contractor’s schedule that shows up in the bid.
What you get for that money: an ADU that will be standing and dry after a Category 3 storm, built with documented materials from manufacturers like GAF, James Hardie, and Therma-Tru. That’s not an intangible promise. It’s specified on the contract and verified at inspection.
Rental Income Reality Check: What an ADU Earns in West Palm Beach
Most homeowners we build for are thinking about rental income. In 2026, a finished 1-bedroom ADU in a neighborhood like Flamingo Park or Grandview Heights rents for $1,500 to $2,200 per month as a long-term rental. Short-term rental potential runs higher but depends on city registration rules and your zoning.
Do the math on a $150,000 detached ADU renting at $1,800 per month: that’s $21,600 in annual gross rent, or a 14.4 percent gross yield. Net of taxes, insurance, and maintenance, most West Palm Beach ADU owners are cash-flowing $800 to $1,100 per month after the first year. That makes the $90,000 to $220,000 upfront price a real investment decision, not just a construction expense.
FAQs – ADU Construction Cost
How much does a 1-bedroom ADU cost in West Palm Beach?
A detached 1-bedroom ADU in West Palm Beach costs $110,000 to $165,000 for a 400 to 500 square foot build with standard finishes. That includes foundation, framing, roof, electrical, plumbing, mini-split HVAC, drywall, paint, flooring, and a basic kitchen and bath. Call (728) 203-9809 for a written quote on your specific site – estimates are free.
Can an ADU be built for under $100,000 in West Palm Beach?
Yes, but only on the garage conversion path, and only when the existing structure is in good condition. An attached garage conversion with sound slab, existing roof structure, and straightforward utility access can come in between $90,000 and $100,000. A detached new build under $100,000 is not realistic in this market in 2026, and we’ll tell you that straight rather than bid low and surprise you later.
Is it cheaper to repair or build an ADU from scratch?
If you already have a habitable ADU that needs repair, repairing is nearly always cheaper than tearing down and rebuilding – but “habitable” is the key word. A rebuild only makes sense when the existing structure has foundation failure, widespread termite damage, or code issues that would cost more to remediate than the structure is worth. If you’re unsure which category your situation falls into, call (728) 203-9809 and we’ll assess it honestly.
How much does a garage conversion cost in West Palm Beach?
A garage conversion in West Palm Beach costs $90,000 to $145,000 depending on whether the garage is attached or detached, condition of the slab and roof structure, and finish level. This is the most affordable path to an ADU in this market, and it makes sense for many older West Palm Beach homes with underused rear garages.
Can you build an ADU the same year you sign the contract?
In most cases, yes – if you sign by early spring, a garage conversion often reaches completion by year-end. New detached ADUs take 6 to 12 months total including permitting, which can slip into the following year if the city’s plan review queue is backed up. We include the full schedule in your written scope before any work begins, so you’re not guessing at occupancy dates.
How much does it cost just to get plans and permits for an ADU in West Palm Beach?
Architectural and structural drawings for an ADU run $6,000 to $14,000 depending on complexity. City of West Palm Beach permit fees, impact fees, and utility connection charges add another $6,000 to $12,000. That’s $12,000 to $26,000 before construction starts – and it’s all included in the Bradford written estimate, not billed as a surprise line item after you’ve committed.
Why Choose Bradford Remodeling Co West Palm Beach for Your ADU
An ADU is a six-figure decision. The contractor you pick determines whether that money produces a clean, permitted, rent-ready unit or a six-month headache with shifting prices and a site that never gets cleaned up.
Curtis Lane leads every Bradford Remodeling Co West Palm Beach project under The Garrison Standard. That means a written price before work starts – non-negotiable, no exceptions, no numbers that change at the door. It means background-checked, uniformed technicians whose identity and conduct standards are set at the Garrison Partners level, not improvised on site. It means a live person answers the phone 24/7 – no voicemail queue between you and an answer when you need one.
And when the job is done, “squared away” means something specific: a clean site, a documented scope with every material listed by brand, and the 365-Day Done Right Promise in your hand – a signed written guarantee covering your completed ADU for a full year. If the work fails inside that window, we come back and correct it at no charge. That’s the entire promise, in writing, on every ADU we build in West Palm Beach.
We install documented, name-brand materials – KraftMaid and Wellborn cabinetry, Cambria and Caesarstone surfaces, Kohler and Moen fixtures, GAF roofing, James Hardie siding, Therma-Tru doors, and Belgard hardscaping among others. Your specifications are traceable, manufacturer-backed, and listed on the written scope before the first material order goes in.
Bradford Remodeling has been part of the Garrison Partners family since 2004. Every location is independently owned and operated, and every location is held to the same standard. We don’t ask you to trust us. We give you the terms in writing and stand behind them.
Ready to talk numbers? Back on the home page, or call us directly at (728) 203-9809 for a free, written ADU estimate with line-item pricing. We’ll walk your lot, confirm what the city will allow, and give you a real number. No pressure, no hedging, no surprises.
Written by Curtis Lane, Owner at Bradford Remodeling Co West Palm Beach, serving West Palm Beach since 2004.
Pricing reflects the West Palm Beach market as of 2026. Bradford Remodeling Co West Palm Beach offers free estimates – call (728) 203-9809.
What Our Customers Say
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