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 Tequesta
A home addition or ADU in Tequesta typically runs $45,000 to $130,000 for room additions and $90,000 to $220,000 for a new detached ADU, with garage conversions landing between $30,000 and $80,000. Those are real numbers for this market, not national averages that fall apart the moment a permit office gets involved. If you’re planning to add square footage anywhere in the 33469 ZIP code, you need a contractor who knows which side of the county line your parcel sits on before a single drawing gets filed. Call (877) 610-1318 and we’ll walk your lot with you, talk through what’s actually buildable, and hand you a written scope with real allowances, not guesses.
We’ve been working in and around Tequesta long enough to know that “just add a room” is never simple here. The rivers, the inlet, the jurisdictional lines, the HOAs, the wind codes. Tom Barrett and his sons run every job themselves, and they’ll tell you the truth about your parcel before you spend a dollar on plans.
Why Barrett & Sons Construction Is Tequesta’s Preferred Home Additions & ADU Company
Tom Barrett founded this company in 1998 and he still answers his own phone. That matters in Tequesta, where the difference between a smooth project and a six-month stall is often whether your contractor knew to file Army Corps paperwork before touching the ground. Our crews have pulled permits and passed inspections on additions and ADUs on both sides of the Palm Beach/Martin County line, and we’ve untangled more than a few projects that started with someone who didn’t know that line existed.
Tequesta homeowners call us because we put every scope, every allowance, and every price change in writing before work starts. That’s not a slogan. It’s the only way we’ve operated for 29 years. If a change order adds cost, you see it on paper with a signature line before a hammer moves. The 90-Day Done Right Promise rides on every contract we write in Tequesta, and it means what it says: if it’s not done right, Tom comes back. One call.
You’ll also get a live person when you call, 24/7. Not a voicemail box or an out-of-state call center. And if you want to check us out first, Tom publishes his name, his address, and his license number. Look it up. Ask anyone on your street. We’re not hard to find.
Our Home Additions & ADU Services in Tequesta
We’re a Home Additions & ADU contractor that handles the whole job, from the first survey to the final inspection sign-off. Here’s what we do most often for homeowners across Tequesta:
ADU Design & Permitting
Before you build anything, someone has to figure out which county’s plan review desk will see your drawings. In Tequesta, that’s a parcel-by-parcel question, and it changes everything about hurricane strapping, impact-opening requirements, and environmental sign-offs. We handle the full design and permitting path, including SFWMD and Army Corps coordination when your lot touches the Loxahatchee or the Intracoastal. A typical ADU design and permitting package in Tequesta runs $9,000 to $20,000 depending on what the environmental review demands.
Garage Conversion ADU
Converting an attached garage into a legal ADU is often the fastest path to rental income or an in-law suite in Tequesta, but it’s rarely as simple as framing a wall where the garage door used to be. In 1970s riverfront homes especially, the existing slab may be below current flood elevation, and the original CBS walls may need upgraded strapping before an inspector will sign the rough-in. We handle the structural review, the flood elevation math, and the HOA paperwork. Garage conversion ADUs in Tequesta generally land between $30,000 and $80,000 once engineering is factored in.
New Detached ADU
A new detached ADU on a Tequesta lot is a real construction project, not a prefab drop-in. The footings have to be engineered for a high seasonal water table, the first floor usually needs to sit 2 to 4 feet above base flood elevation, and every opening has to meet impact-rated standards because of the inlet’s wind exposure. We build them right, with permits pulled and inspections signed, and we quote them honestly. New detached ADUs in Tequesta run $90,000 to $220,000, and we’ll give you a line-item written estimate before you commit to anything.
Junior ADU & Interior Conversion
For smaller parcels or homes where a full detached build doesn’t fit the setback rules, a junior ADU or interior conversion can be the smart play. We convert existing interior space, dens, bonus rooms, unused wings into legal, rentable living quarters with their own entrance and kitchenette where code allows. The jurisdictional questions still apply, but the scope is smaller and the permit path is usually faster. We’ll tell you straight if your interior conversion can meet the local definition of an ADU or if you’re better off with a different approach.
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.
Trusted Brands We Service in Tequesta
We install materials you can look up, not mystery brands off a van. On Tequesta additions and ADUs, that means impact-rated window and door packages from PGT, Simonton, and Ply Gem, all spec’d for the salt air and wind loads you get this close to Jupiter Inlet. We order direct and stage deliveries on a schedule that keeps your project moving without turning your driveway into a lumberyard. If a warranty claim ever comes up, we handle the manufacturer paperwork for you, and we spec fasteners and flashing rated for coastal corrosion, not the inland versions that fail early out here.
Common Home Additions & ADU Problems We See in Tequesta Homes
- County line confusion killing a permit. A garage conversion in a 1970s riverfront home proceeds with a standard building permit, but the inspector rejects the rough-in because the property is actually on the Palm Beach side of the Village line and required different hurricane-strap details. We verify jurisdiction before the first drawing is filed.
- Second-story additions on slabs never meant for them. Older single-story CBS ranch homes from the 1960s and 1970s often have undersized footings. Adding a second story without an engineer’s review leads to structural retrofits and, worse, a voided builder structural warranty if the home is newer and still under one.
- Environmental permits skipped on waterfront lots. A detached ADU near the Loxahatchee River gets framed and roofed without SFWMD sign-off, and the HOA’s architectural review board withholds final approval because the setback from the mangrove line violates recorded plat restrictions. Now the project owns a stop-work order plus a redesign.
- Inland-grade materials corroding in inlet air. Salt air from Jupiter Inlet accelerates pitting on load-bearing clips, flashing, and rebar cover. A sunroom specified with inland aluminum fasteners can fail a corrosion warranty inspection within two years. We spec coastal-grade materials from day one.
Pricing for Home Additions & ADU in Tequesta, FL
Here’s what we quote in Tequesta, based on permits we’ve actually pulled and inspections we’ve actually passed here. These are line-item ranges, not phone guesses:
| Service | Tequesta Price Range |
|---|---|
| ADU Design & Permitting | $9,000 - $20,000 |
| Room Additions | $45,000 - $130,000 |
| Garage Conversion ADU | $30,000 - $80,000 |
| Second Story Additions | $50,000 - $130,000 |
| New Detached ADU | $90,000 - $220,000 |
What moves the number? Environmental review scope, flood elevation requirements, impact-rated opening counts, and whether your parcel sits in Palm Beach or Martin County. We put every allowance and every change order in writing before work proceeds, so the price you sign is the price you get unless you ask for something different. Call (877) 610-1318 and we’ll give you a free, no-trip-charge estimate inside the county.
We Also Serve Cities Near Tequesta
Our crews build additions and ADUs in Jupiter, Hobe Sound, North Palm Beach, and Palm Beach Gardens, but the jurisdictional quirks change every few miles, so we treat each lot as its own project. If you’re on the Tequesta edge or just over a line, call us and we’ll tell you exactly which rules apply to your address. Dispatch and scheduling run through our South Florida Miami office, and the same Barrett & Sons crew that works Tequesta handles the surrounding communities.
Serving Tequesta, FL - Our Local Coverage Area
We’re based in the Tequesta 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 Tequesta
You verify it by parcel, not by street address intuition. The Palm Beach/Martin County line runs through the Village of Tequesta, so two houses across the street from each other can sit in different counties with different plan review timelines, inspection pipelines, and hurricane-strap requirements. We pull the parcel control number and confirm jurisdiction before we draw anything, so your permit application lands on the right desk the first time. Call (877) 610-1318 and we’ll check your lot for free.
A new detached ADU on a Tequesta waterfront lot with Loxahatchee River buffer restrictions runs $90,000 to $220,000, and the environmental compliance work on top of standard construction can add $9,000 to $20,000 in design and permitting costs alone. The river’s federal Wild and Scenic designation triggers Army Corps Section 404/10 coordination before you break ground anywhere within sight of the river bank. We file that paperwork upfront so you don’t get a stop-work order mid-project like the ranch near the river where an out-of-area contractor had already poured a slab without Corps sign-off. We stopped work, documented everything, filed the missing permit path, and redesigned the scope to elevate the finished floor 3 feet above base flood elevation. The change order added $11,000 and six weeks, but the project passed inspection. Get your number by calling (877) 610-1318.
Usually yes, but only if you get the HOA’s architectural review board sign-off before work starts and you don’t touch structural elements that fall under the original builder’s structural warranty. In newer Tequesta master-planned communities, the builder warranty typically covers the original structure only, and modifying load-bearing walls, trusses, or the roof system without prior approval can void it. We coordinate the HOA paperwork, keep the structural scope within warranty-safe limits where possible, and document everything in writing. Call (877) 610-1318 and we’ll review your HOA’s recorded plat restrictions before you commit.
Because they discovered something between the first and second look, and they didn’t tell you what it was. In Tequesta, the two most common reasons are an undersized footing on a 1960s or 1970s CBS ranch home and a truss system in a newer master-planned home that was only engineered for a single-story load. Both require structural retrofits that add real cost, and a contractor who doesn’t explain the change order in writing is handing you a surprise invoice. We give you one written scope with allowances in writing, and if something changes, you get a change order on paper before work proceeds. Call (877) 610-1318 for a second opinion on any written estimate. It’s free.
Replace the things you touch every day: kitchen cabinet boxes and drawer slides, hollow-core interior doors, and the thermostatic shower valves in guest bathrooms. Those are the first failures we see in 3-to-5-year-old Tequesta homes. Leave the things that are expensive to replace and rarely break: structural trusses, foundation walls, and roof sheathing, provided they were never compromised. If you’re adding a second story to a newer home, have an engineer verify the existing truss system before you plan anything above it. Get a free walkthrough and written report by calling (877) 610-1318.
Contact
Planning a home addition or ADU in Tequesta is a serious project. Get a free estimate from a contractor who puts his name on the truck, pulls every permit, signs every inspection, and backs the work with a written 90-Day Done Right Promise. Call (877) 610-1318 and ask for Tom. We’ll walk your lot, verify your county, check your flood zone, and hand you a written line-item quote before you spend a dollar.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Tequesta and surrounding communities since 1998.