Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
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Before
AfterFast, Reliable Home Additions & ADU Across Delray Beach
A home addition or ADU in Delray Beach typically runs $45,000-$130,000 for attached room additions and $90,000-$220,000 for new detached units, with permitting timelines stretching longer east of the Intracoastal due to Florida DEP coastal permits. We’re Rowan Construction Group, and our crews work Delray Beach weekly from our Miami-area dispatch office. Call (754) 254-8065 to schedule your free written estimate - every quote includes a flat price, written scope, and documented photo record before anyone picks up a tool.
Why Rowan Construction Group Boca Raton Is Delray Beach’s Preferred Home Additions & ADU Company
We’ve delivered 4,000-plus projects since 2007, every one with a written price before work started and a documented record when the crew left. In Delray Beach specifically, that discipline matters more than most places. The city’s split personality - 1950s CBS block west of Swinton Avenue, luxury builds east of the Intracoastal, and the Atlantic Avenue corridor’s redevelopment pressure - means no two additions face the same regulatory stack.
Our Home Additions & ADU team knows the difference between a Del-Ida Park renovation that triggers the Historic Preservation Board and a Nassau Park garage conversion that doesn’t. We know which projects need the DEP permit before the city permit, and we schedule for it. Our 365-Day Done Right Promise is printed on every page, backed by a terms page, not an asterisk. Under Clause 1 of The Haven Standard, your price is written before anyone starts - always.
Calls are answered by a live person 24/7. Crews are background-checked and uniformed. Every visit includes a documented photo record as standard, not an upgrade. And we offer a Free Second Opinion on any written estimate - bring a competitor’s Delray Beach quote and we’ll review it line by line at no charge.
Our Home Additions & ADU Services in Delray Beach
ADU Design & Permitting
ADU design and permitting in Delray Beach starts with understanding which regulatory layer your property sits in. East of Florida’s Coastal Construction Control Line, we file the Florida DEP permit first, then the city building permit - a sequence contractors commuting from Boynton Beach or Boca Raton routinely reverse, adding weeks to the schedule. Our drawings specify stainless or hot-dipped galvanized hardware from the outset, because salt-air corrosion at this latitude pits standard galvanized fasteners within a couple seasons. The permit package includes wind-load calculations for the 170 mph design speed Palm Beach County requires, and we don’t start the clock on construction until every signature is in hand.
Garage Conversion ADU
Garage conversions in Delray Beach run $30,000-$80,000 and face a specific trap: many 1960s and 1970s garages in neighborhoods west of Swinton Avenue were slab-on-grade with no footing depth to current code. Converting to habitable space means proving the slab can carry the load, or pouring new footings - a line item cheap quotes often omit. We also verify whether the existing roof structure can handle the insulation and HVAC load; Delray Beach’s cooling demand is severe, and an under-spec’d mini-split in a converted garage fails by July. Our written quote includes the structural assessment, the MEP rough-in, and the final inspection sign-off.
New Detached ADU
New detached ADUs are the most complex addition we build in Delray Beach, and the most regulated. The water table in eastern areas sits 2-3 feet below grade, so excavation for footings and underground utilities becomes a dewatering operation, not a straightforward dig. We spec this in the written price from day one. For CCCL-adjacent properties, the DEP permit timeline drives the whole schedule; we build that float into the project calendar. The finished unit must meet the same wind-load standards as the primary residence - 170 mph, continuous load path, impact-rated openings if required by zone. We document every connection with photos for the customer’s file and the insurer’s records.
Junior ADU & Interior Conversion
Junior ADUs and interior conversions in Delray Beach work best in the larger 1950s-1970s CBS homes in central neighborhoods, where a separate entrance and kitchenette can carve out 500 square feet without expanding the footprint. The 50% improvement threshold is the critical calculation here: if the total project value exceeds half the assessed value of the existing structure, Palm Beach County triggers full structural code upgrades. We run that math before we quote, because a junior ADU that crosses that line becomes a $15,000-$25,000 more expensive proposition. Our quote tells you where you stand before you sign.
Room Additions
Room additions in Delray Beach - whether a master suite expansion, a home office, or a family room - require the same wind-load compliance as new construction. The tie-in to existing CBS block is the detail that separates a durable addition from a future leak. We specify a weep screed and drainage plane at the junction, not caulk and hope. For homes in Del-Ida Park or other historic districts, we coordinate with the Historic Preservation Board early, because their design review runs parallel to the building permit and can’t be fast-tracked later.
ADU Site Prep & Utilities
Site prep for ADUs in Delray Beach means dealing with sandy, high-water-table soils and existing septic or sewer connections that may need upgrading. Palm Beach County requires separate utility metering for most detached ADUs, and the service lateral from the main to the new unit is a significant line item - typically $4,000-$8,000 - that we include in the written quote, not as a discovered condition.
Second Story Additions
Second story additions on Delray Beach’s older CBS homes are structurally demanding. The existing single-wythe block walls often lack the lateral bracing for a second floor; we engineer a solution - typically a reinforced concrete tie-beam or steel moment frame - and price it in the initial quote. This is not a place for optimism.
Sunrooms & Enclosed Patios
Sunrooms and enclosed patios in Delray Beach must meet the same wind-load standards as the main structure if they’re conditioned space. We specify impact-rated glazing throughout, because the savings from non-impact glass disappear the first time a named storm enters the forecast.
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 Delray Beach
We source across fifty-plus vetted brands, which lets us write honest numbers rather than inflated ones. For Delray Beach additions and ADUs, that means GAF or CertainTeed roofing systems rated for the 170 mph wind zone, Grohe or Kohler fixtures with documented flow rates for county water-efficiency compliance, and impact-rated windows from manufacturers with Florida Product Approval numbers we can verify. We don’t spec a brand we can’t show you the spec sheet for. The written quote names the manufacturer, the model, and the warranty term - no “contractor grade” ambiguity.
Common Home Additions & ADU Problems We See in Delray Beach Homes
- Underestimated permitting timelines on CCCL properties. Any addition or new detached ADU east of Florida’s Coastal Construction Control Line needs a separate Florida DEP permit before the city building permit can issue. Contractors unfamiliar with Palm Beach County coastal work regularly skip this step, discover it at inspection, and blow the project schedule by four to six weeks.
- The 50% improvement threshold surprise. Renovations on 1950s-1970s CBS homes that cross the 50% improvement threshold trigger full structural upgrades - hurricane straps, connectors, load-bearing corrections. Cheap quotes leave these out until change order time, when the customer is already committed.
- Fastener corrosion within two seasons. Delray Beach’s direct Atlantic exposure accelerates salt-air corrosion of embedded rebar, metal hurricane connectors, and exterior fasteners faster than projects even 10 miles inland. Standard galvanized hardware shows rust pitting within 18-24 months. We spec stainless or hot-dipped galvanized as baseline.
- Water table excavation costs. The water table in eastern Delray Beach neighborhoods frequently sits 2-3 feet below grade. Any excavation for footings or underground utilities requires dewatering, not just a backhoe. Quotes that price for dry-ground digging hit change orders immediately.
Pricing for Home Additions & ADU in Delray Beach, FL
Here’s what a written Rowan quote contains for Delray Beach addition and ADU work:
| Service | Price Range in Delray Beach |
|---|---|
| Home Addition (attached room addition) | $45,000-$130,000 |
| ADU Construction (new detached unit) | $90,000-$220,000 |
| Garage Conversion ADU | $30,000-$80,000 |
What moves the number: square footage, structural complexity, whether the project triggers the 50% improvement threshold, DEP permit requirements for CCCL-adjacent properties, and the dewatering or soil conditions we find. Every quote is flat-priced with a written scope and written warranty. No work proceeds on a change until the change order is signed - the administrative discipline Haven acquired Rowan for, and the reason our projects finish within a few percent of the number the customer agreed to. Call (754) 254-8065 for your free written estimate.
We Also Serve Cities Near Delray Beach
Our crews work throughout southern Palm Beach and northern Broward counties, including Home Additions & ADU in Delray Beach proper plus Boynton Beach, Boca Raton, Deerfield Beach, and Coconut Creek. Dispatch and scheduling are coordinated from our Miami-area office; crews serve each city locally with the same written-price-first discipline.
Serving Delray Beach, FL - Our Local Coverage Area
We’re based in the Delray 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 Delray Beach
Yes, if the property lies east of Florida’s Coastal Construction Control Line, which bisects Delray Beach’s oceanside neighborhoods. The Florida DEP permit must be approved before the city of Delray Beach will issue the building permit, and the DEP review timeline typically adds several weeks. Contractors who skip this step discover it at inspection and stall the project. Call (754) 254-8065 and we’ll verify your property’s CCCL status during the free estimate.
The 50% improvement threshold is a Palm Beach County code trigger: when the total value of a renovation exceeds 50% of the assessed value of the existing structure, the entire building must be brought to current hurricane wind-load standards. For Delray Beach’s 1950s-1970s CBS homes, this means adding hurricane straps, upgrading connectors, and often correcting load-bearing elements - work that can add $15,000-$40,000 to the project. We calculate this threshold before we quote, not after demolition starts. Call (754) 254-8065 for a threshold analysis with your free estimate.
Stainless steel or hot-dipped galvanized hardware, specified as baseline, not upgrade. Delray Beach’s direct Atlantic exposure accelerates salt-air corrosion of standard galvanized fasteners; we regularly find pitting within 18-24 months on projects that spec’d the cheaper option. The written quote names the hardware grade, the manufacturer, and the corrosion-resistance rating. Call (754) 254-8065 and we’ll show you the spec sheet.
A compliant quote includes: the DEP permit filing for CCCL-adjacent properties, the 50% improvement threshold calculation, stainless or hot-dipped galvanized hardware spec’d as baseline, dewatering provisions for high-water-table excavations, wind-load engineering to 170 mph, impact-rated openings where required, and a documented photo record of every visit. Cheap quotes omit one or more of these, then recover the cost in change orders once the customer is committed. Under Clause 1 of The Haven Standard, our price is written before anyone starts - every time. Call (754) 254-8065 for a line-item written quote.
Yes, documented wind-load compliance can reduce your windstorm premium and is often required for coverage renewal after a significant addition. We provide the engineer’s letter, the inspection sign-off documentation, and the photo record of connections as standard deliverables - not upgrades - so you have evidence to submit to your insurer. Call (754) 254-8065 and we’ll explain what documentation your specific carrier typically requires.
Ready to price your Delray Beach addition or ADU? Call (754) 254-8065 to schedule your free written estimate. Every quote includes a flat price, written scope, written warranty, and documented photo record. Under The Haven Standard, no work starts until the price is in writing and signed - and no change proceeds without a signed change order. That’s the discipline that has kept our projects within a few percent of the agreed cost across 4,000-plus jobs since 2007.
Written by Grant Rowan, Owner at Rowan Construction Group, serving Delray Beach since 2007.