Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
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Home additions and ADU construction in Deerfield Beach typically run $45,000-$130,000 for room additions and $90,000-$220,000 for detached accessory dwelling units, with most projects taking 8-16 weeks from permit to final inspection. We’re Rowan Construction Group, and our crews work Deerfield Beach regularly - from the 1950s concrete-block homes inland off Hillsboro Boulevard to the low-rise condominiums along the Intracoastal. Dispatch and scheduling run through our Miami office, but the crew that shows up at your door knows Broward County’s High-Velocity Hurricane Zone requirements cold. Call (754) 254-7676 to schedule your free estimate.
Why Rowan Construction Group Fort Lauderdale Is Deerfield Beach’s Preferred Home Additions & ADU Company
We’ve delivered over 4,000 projects since 2007, and a significant share of them sit inside Deerfield Beach city limits. Our customers here tend to find us the same way: they read the three-star reviews first, then call to ask if we’ll put a number in writing before anyone picks up a tool. We will. Under Clause 1 of The Haven Standard, every project gets a flat written price and a written scope before work starts - no exceptions.
Response time to Deerfield Beach is typically same-week for initial site visits, with quotes delivered within 48 hours of measurement. Our crews are background-checked, uniformed, and carry documented photo records on every visit - standard, not an upgrade. A live person answers our phones 24/7.
The local knowledge that matters here isn’t generic Florida experience. Deerfield Beach sits in Broward County’s High-Velocity Hurricane Zone, one of only two counties in Florida under these stricter wind-resistance rules. The county line with Palm Beach runs along the city’s northern edge, and contractors licensed primarily for Palm Beach County work may hold credentials that don’t satisfy Broward’s HVHZ-specific approval requirements. Homeowners south of Hillsboro Boulevard who hire those contractors routinely face failed inspections and costly re-work. We hold the proper Broward approvals, and every addition we build is engineered and inspected to HVHZ standards from day one.
Our Home Additions & ADU Services in Deerfield Beach
New Detached ADU
A detached ADU in Deerfield Beach is a standalone living unit on your property - full kitchen, bath, sleeping area, and its own HVAC. In Deerfield Beach, these typically cost $90,000-$220,000 depending on size, foundation type, and utility tie-ins. The city has a mix of 1950s-1970s single-family lots with space to build and denser neighborhoods where setback rules get tight. We handle the site plan, HVHZ-rated fenestration, and the separate meter or sub-panel question upfront so you’re not redesigning mid-project. Our Home Additions & ADU team has built detached units from quiet streets near Pioneer Park to properties closer to the Intracoastal.
Room Additions
Room additions in Deerfield Beach - whether a master suite expansion, a family room bump-out, or a home office - generally fall in the $45,000-$130,000 range. The real variable is what we find when we open the wall. On a 1968 concrete-block house off SW 10th Street, our crew opened the rear wall for a 340-square-foot room addition and found aluminum branch wiring, a rotted subfloor at the old slider, and wood framing that didn’t carry the new load path. We stopped, wrote a change order with photos and fixed pricing, and got owner approval in writing before a single stud moved. The HVHZ-rated windows, rough-in inspection sign-off, and final punch list all passed on schedule. That’s how we work - no surprise, no verbal promises, no work proceeds without a signed change order.
Garage Conversion ADU
Converting a garage to an ADU in Deerfield Beach runs $30,000-$80,000 and triggers more code upgrades than most homeowners expect. Because it’s a change of occupancy - from storage/vehicle space to habitable dwelling - the permit pulls requirements for egress windows, energy compliance, impact-rated fenestration, and structural load-bearing verification. The original slab may need moisture remediation. The electrical panel may need upgrading. We price these items as line-item allowances in the original contract, with discovery contingencies written in plain English, so you’re not funding a budget blowout halfway through framing.
Junior ADU & Interior Conversion
A Junior ADU, or JADU, is created within the existing footprint of your home - typically by partitioning a portion of the house with its own entrance, small kitchen, and bath facilities. In Deerfield Beach’s older concrete-block homes, these conversions require careful attention to the original slab, ceiling height compliance, and the HVHZ-rated separation between units. We assess the existing structure before quoting, not after demolition starts.
ADU Design & Permitting
Deerfield Beach’s zoning for ADUs allows specific configurations depending on lot size, existing structure coverage, and utility access. We prepare the site plan, structural drawings, and permit package for city submittal, including HVHZ engineering stamps where required. The permit timeline in Broward County typically runs 4-8 weeks for residential additions; we track it weekly and update you by text.
ADU Site Prep & Utilities
Site preparation in Deerfield Beach often means dealing with sandy, well-draining soils that can shift during dry seasons, plus the occasional high water table near the Intracoastal. We handle excavation, foundation (slab-on-grade or stem wall depending on flood zone), and utility tie-ins - water, sewer, electric, and gas if applicable - with the same written-scope discipline we apply to the build itself.
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.
Before
AfterTrusted Brands We Service in Deerfield Beach
Rowan Construction Group sources across fifty-plus vetted brands, and we specify them by name in every written quote. For roofing and exterior envelope work on additions and ADUs in the HVHZ, we regularly specify GAF and Owens Corning systems - both hold Miami-Dade Product Control approvals that satisfy Broward’s stricter wind-resistance requirements. For windows and doors, we use impact-rated products from manufacturers with Florida HVHZ listings, not just standard coastal ratings. We don’t inflate quotes with premium-brand names you didn’t ask for, and we don’t substitute cheaper materials without a signed change order. The brand list in your contract is the brand list on your job site.
Common Home Additions & ADU Problems We See in Deerfield Beach Homes
- Aluminum wiring in 1960s-1970s homes. When we open walls for a room addition, we regularly find aluminum branch wiring that hasn’t been updated. It’s a fire hazard, and Broward County requires remediation before the inspector will sign off on new circuits. We build this discovery into our contract allowances so the fix is priced before demolition, not after.
- Post-tension slab edge deterioration. Many Deerfield Beach homes, especially inland concrete-block construction from the 1960s and 1970s, sit on post-tension slab systems. The edges can spall or delaminate, particularly where drainage has been poor. Adding square footage means tying into that slab - and we need to know its condition before we quote the foundation tie-in.
- Failed waterproofing at original sliders and windows. South Florida’s wet season exposes every gap in a home’s envelope. On additions where we’re removing an old slider to open the wall, we frequently find rot in the subfloor and bottom plate. We photograph it, write the change order, and fix it - but only after you approve the price in writing.
- Contractors without Broward HVHZ credentials. This isn’t a material defect, but it’s the most expensive mistake we see. A contractor licensed primarily in Palm Beach County can legally hold credentials that don’t satisfy Broward’s HVHZ-specific approval requirements. Homeowners south of Hillsboro Boulevard who hire them face failed inspections, re-permitting, and re-build costs that can add 20-40% to the project. We carry the proper approvals; we show them on request.
Pricing for Home Additions & ADU in Deerfield Beach, FL
Here’s what home additions and ADU construction costs in Deerfield Beach’s current market:
| Project Type | Typical Range in Deerfield Beach |
|---|---|
| Home Addition (room addition, bump-out, second story) | $45,000-$130,000 |
| ADU Construction (new detached unit) | $90,000-$220,000 |
| Garage Conversion ADU | $30,000-$80,000 |
These ranges reflect HVHZ engineering, impact-rated fenestration, and Broward County permit fees - all mandatory, not optional. What moves a project within the range: size, foundation type, utility distance, and what we find when walls open. We build discovery allowances into every contract, with fixed pricing for common scenarios. No work proceeds on a change until the change order is signed. That’s the discipline that has kept our projects within a few percent of the agreed price across 4,000-plus jobs. Call (754) 254-7676 for your free estimate - we’ll review your site, your goals, and your existing structure, then deliver a written price before any work starts.
We Also Serve Cities Near Deerfield Beach
Our crews work throughout Broward County and into southern Palm Beach County, with regular projects in Deerfield Beach, Pompano Beach, Margate, Coral Springs, and Fort Lauderdale. The same written-price discipline, the same HVHZ expertise, the same documented photo record on every visit. If you’re near the county line and unsure which jurisdiction’s rules apply to your property, we’ll tell you before you sign anything.
Serving Deerfield Beach, FL - Our Local Coverage Area
We’re based in the Deerfield 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 Deerfield Beach
Deerfield Beach sits in Broward County’s High-Velocity Hurricane Zone, which requires stricter wind-resistance engineering and impact-rated materials than Palm Beach County’s standard coastal codes. That adds cost in structural design, window and door specifications, and inspection complexity. A quote from a Delray contractor may not include these requirements, or the contractor may not hold Broward HVHZ approvals at all. Call (754) 254-7676 and we’ll review your site-specific requirements line by line - estimates are free.
Yes, but the slab condition and the tie-in method need assessment first. Post-tension slabs use steel cables under tension to resist cracking; cutting or drilling without knowing the cable layout risks structural failure. We bring in a structural engineer for the scan and the load-path design, and we price that step as a line item in your written quote. Call (754) 254-7676 to schedule the assessment - estimates are free.
Yes. A garage-to-ADU conversion changes the occupancy classification from storage/vehicle to habitable dwelling, which triggers requirements for egress windows, energy code compliance, impact-rated fenestration, and often electrical panel upgrades. In Deerfield Beach’s HVHZ, the fenestration requirements alone can add $4,000-$8,000 compared to a non-HVHZ jurisdiction. We itemize these upgrades in the original contract, not as surprises mid-project. Call (754) 254-7676 for a written scope and price - estimates are free.
They may hold a valid Florida contractor’s license, but if their credentials don’t include Broward County’s HVHZ-specific approval requirements, your project can fail inspection and require re-permitting and re-work at your cost. The county line runs along Deerfield Beach’s northern edge, and this trap catches homeowners regularly. We carry proper Broward HVHZ approvals and show them on request. Call (754) 254-7676 to verify before you sign - estimates are free.
We inspect first, write allowances into the contract for common discoveries in homes of your era and construction type, and stop work to photograph and price any surprise before touching it. No change proceeds without a signed change order with fixed pricing. That discipline - the one Haven acquired Rowan for in 2007 - is why our projects finish within a few percent of the number the customer agreed to. Call (754) 254-7676 to schedule your free estimate.
Written by Grant Rowan, Owner at Rowan Construction Group, serving Deerfield Beach since 2007 under The Haven Standard.