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 Deerfield Beach
Home additions and ADU construction in Deerfield Beach typically run $45,000-$130,000 for room additions and $90,000-$220,000 for detached ADUs, with garage conversions landing between $30,000-$80,000. Most projects require separate permits from any ongoing milestone inspection work, even when your building is already under SB 4D review. Call (754) 714-6540 to schedule your free written estimate - we serve Deerfield Beach from our South Florida coordination office, with crews working locally across the city.
We’ve been building in Deerfield Beach long enough to know the difference between a 1960s concrete-block ranch near the Intracoastal and a 1970s Century Village unit facing mandatory structural inspection. That difference matters for your permit path, your engineering requirements, and your final price. Our Home Additions & ADU team documents every assumption in writing before work starts - Clause 1 of The Haven Standard - because an addition on a carbonated slab with corroded hurricane strapping is not the same project as one on new construction, and the quote should reflect that honestly.
Why Rowan Construction Group Pompano Beach Is Deerfield Beach’s Preferred Home Additions & ADU Company
Rowan Construction Group has delivered 4,000-plus projects since 2007, every one with a written flat price before any tool was picked up. In Deerfield Beach specifically, that discipline matters more than most places. The city’s concentration of aging concrete-frame condos and 55+ communities means homeowners are often navigating two timelines at once: their own aging-in-place needs and their building’s mandatory milestone inspection schedule. We keep those timelines from colliding.
Our crews are background-checked, uniformed, and trained to the Broward County High-Velocity Hurricane Zone standard - the strictest wind-resistance code in the United States. Every visit includes a documented photo record, delivered to you as standard, not an upgrade. A live person answers calls 24/7, and Grant Rowan stands behind the 365-Day Done Right Promise printed on every contract.
We also offer a Free Second Opinion on any written estimate from another contractor. Bring us a competitor’s line-item quote and we’ll review it at no charge - because informed customers make better decisions, and better decisions lead to projects that finish within a few percent of the agreed price.
Our Home Additions & ADU Services in Deerfield Beach
Junior ADU & Interior Conversion
The most common aging-in-place project we see in Deerfield Beach’s 55+ communities: converting an existing bedroom suite or carving a Junior ADU from underused square footage inside a single-family home or villa. We block walls for grab bars at 33-inch and 36-inch heights during rough framing, not after tile is set. Zero-threshold shower pans with slip-rated surfaces replace standard curbs. Wider doorways - 32-inch minimum, 36-inch where structure allows - accommodate future mobility needs. In Century Village and similar condos, we verify whether the HOA’s ARB must approve interior partition changes before we cut a permit application. The city still requires separate electrical and plumbing permits for added water heaters, subpanel upgrades, or wet-wall relocation, regardless of the building’s milestone inspection status.
Garage Conversion ADU
Our crew converted a 1980s Century Village garage into a Junior ADU for a seasonal resident, cutting a zero-threshold shower pan, blocking for grab bars in the new bath, and upgrading the subfloor over a carbonated concrete slab before setting KraftMaid cabinets and a Moen fixture package. We pulled the electrical and plumbing permits separate from the building’s milestone inspection, and the inspection sign-off came through clean once the HOA ARB letter and Broward County HVHZ impact-door spec were matched. Punch list closed in one walk because everything - allowances, ARB approvals, draw schedule - was documented in writing up front. That’s the Haven Standard in practice. Garage conversions in Deerfield Beach run $30,000-$80,000 depending on whether the slab needs leveling, the electrical service requires upgrading from the original 100-amp panel, and the overhead door is replaced with an HVHZ-rated entry assembly.
New Detached ADU
Detached ADUs in Deerfield Beach face a specific constraint: many parcels east of Federal Highway and near the Hillsboro Canal network sit in FEMA Special Flood Hazard Areas. New construction requires elevated slab heights and flood-vent systems that add $8,000-$15,000 to foundation costs compared to inland Florida markets. We engineer for HVHZ wind loads from the first footing inspection - impact-rated windows and doors, continuous load-path strapping from foundation to ridge, and roof assemblies product-approved specifically for Broward County’s zone. A typical detached ADU in Deerfield Beach runs $90,000-$220,000, with the upper range reflecting flood-zone foundation requirements and premium finish packages.
Room Additions
Single-story room additions on Deerfield Beach’s 1960s-1980s concrete-block homes require structural review before we lay out walls. Original hurricane strapping on these homes is often undersized, corroded, or missing entirely - a condition our photo record documents before demolition begins. We engineer tie-downs and continuous load paths to current HVHZ standards, pulling permits through Broward County’s enhanced review process. Room additions start around $45,000 for modest footprint expansions with standard finishes; second-story additions require full structural analysis and typically start above $75,000. Every quote includes a written scope, a fixed price, and a draw schedule tied to inspection milestones - no work proceeds without signed authorization.
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
We source across fifty-plus vetted brands so the written quote reflects honest numbers, not inflated allowances. For Deerfield Beach’s aging-in-place and ADU projects, we regularly specify KraftMaid and Wellborn cabinet lines with soft-close hardware and accessible pull-down shelving, Moen and Kohler fixtures with lever handles and thermostatic valves, and Owens Corning insulation and roofing assemblies rated for HVHZ wind speeds. Our local supply relationships mean replacement parts arrive within a day or two, not weeks - important when a seasonal resident is scheduled to return and the punch list needs to close.
Common Home Additions & ADU Problems We See in Deerfield Beach Homes
- Assuming in-unit work is covered by the building’s milestone inspection. The HOA’s SB 4D structural repairs and your interior ADU or bathroom addition are separate permit streams. We’ve seen homeowners spend $15,000 on unpermitted wet-wall work that surfaced at resale, requiring full demolition and re-inspection.
- Skipping structural review for load-bearing changes on 1970s concrete-block homes. Original hurricane strapping in Deerfield Beach’s mid-century stock often cannot handle new point loads from second-story additions or enlarged openings. We engineer before we build.
- Treating aging-in-place finishes as cosmetic upgrades. A curbless shower without proper blocking, a standard pan where a zero-threshold was needed, or smooth porcelain on a wet floor - these choices defeat the purpose. We spec slip-rated surfaces and structural backing as standard.
- Ignoring FEMA flood-zone requirements on new detached construction. Deerfield Beach’s dense canal network and flat terrain place many parcels in Special Flood Hazard Areas. Elevated slabs and flood vents are not optional; they’re code, and unpermitted omission triggers enforcement.
Pricing for Home Additions & ADU in Deerfield Beach, FL
We put the number in writing before anyone picks up a tool. Below are the ranges we quote for Deerfield Beach’s market, calibrated for Broward County’s HVHZ requirements and the local conditions our crews encounter.
| Project Type | Typical Range in Deerfield Beach |
|---|---|
| Garage Conversion ADU | $30,000 - $80,000 |
| ADU Construction (detached) | $90,000 - $220,000 |
| Home Addition (room or second story) | $45,000 - $130,000 |
| Walk-In Shower Installation | $4,500 - $12,000 |
| Tub-to-Shower Conversion | $3,500 - $10,000 |
| Bathroom Vanity Installation | $800 - $3,000 |
What moves a project within these ranges: slab condition and whether carbonated concrete requires remediation; electrical service capacity and panel upgrade needs; HVHZ-rated window and door specifications versus standard impact products; flood-zone foundation requirements; and finish selections from our vetted brand list. Every quote is a flat price with a written scope and a written warranty. No change proceeds without a signed change order - the administrative discipline that has kept our projects within a few percent of the agreed cost since 2007. Call (754) 714-6540 for your free estimate.
We Also Serve Cities Near Deerfield Beach
Our crews work throughout Broward and northern Palm Beach counties, including Boca Raton, Pompano Beach, Coconut Creek, and Margate. Each city has its own permit office, inspection schedule, and code interpretations - we know the differences and quote accordingly. For homeowners specifically in Deerfield Beach, we coordinate scheduling from our South Florida office to minimize travel time and keep crews productive on your job site.
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
Yes, but only as a Junior ADU or interior conversion within your existing footprint - no new exterior square footage. The critical distinction: your building’s SB 4D milestone inspection covers structural and life-safety elements of the common structure, not your in-unit electrical, plumbing, or partition changes. We pull separate permits for any wet-wall work, subpanel upgrades, or added water heaters, and we secure HOA ARB approval before filing with the city. Call (754) 714-6540 to review your specific unit’s constraints - estimates are free.
Yes, if the work involves plumbing relocation, electrical additions, or structural changes like widening doorways or modifying load-bearing walls. Cosmetic tile replacement within existing wet walls may not require permitting, but adding a zero-threshold shower pan, grab-bar blocking, or a comfort-height toilet with bidet wiring does. We verify permit requirements during our initial site visit and include all filing costs in the written quote. Call (754) 714-6540 for an exact scope and price.
Broward County’s High-Velocity Hurricane Zone requires impact-rated windows and doors product-approved specifically for this zone, continuous load-path engineering from foundation to roof, and roof assemblies tested to higher wind pressures than inland Florida. For enclosed patios on existing homes, we often must upgrade the original structure’s tie-downs to meet current standards - an added cost that honest quotes include upfront. The HVHZ standard is non-negotiable; unpermitted work will fail inspection and complicate resale. Call (754) 714-6540 to schedule a site evaluation.
A garage conversion ADU typically runs $30,000-$80,000, while a detached ADU runs $90,000-$220,000. The gap reflects foundation work (existing slab versus new elevated construction), utility trenching and meter separation, and flood-zone requirements that often apply to new detached structures near Deerfield Beach’s canals. Garage conversions also avoid some HOA ARB complexity when the garage is already part of your single-family parcel. Call (754) 714-6540 for a line-item quote on either option - we offer Free Second Opinions on competitor estimates too.
Homeowners assume the building’s SB 4D repairs cleared the path for their interior work. They didn’t. Milestone inspections address structural concrete, façade systems, and common-area life safety - not your unit’s electrical panel, plumbing rough-in, or partition changes. When aging-in-place contractors fail to pull separate permits or secure HOA ARB letters, the project stalls at final inspection or surfaces as unpermitted work at resale. We document the permit path in writing before demolition starts, so the punch list closes on schedule. Call (754) 714-6540 to avoid this common delay.
Written by Grant Rowan, Owner at Rowan Construction Group, serving Deerfield Beach and South Florida since 2007.