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 Richmond Heights
Home addition and ADU work in Richmond Heights, FL typically runs $45,000-$130,000 for a room addition and $90,000-$220,000 for a detached ADU, with garage conversions landing between $30,000 and $80,000. Those numbers carry real meaning here because Richmond Heights sits inside Miami-Dade’s High-Velocity Hurricane Zone, where a permit on an older CBS home triggers wind-load engineering, impact openings, and roof-to-wall connectors that contractors in Broward won’t quote. We’re Barrett & Sons Construction, and we’ve been doing this work since 1998. If you’re thinking about opening up a 1950s or 1960s concrete block home on a street like Lincoln Boulevard or sw Cantina Lane, call (877) 610-1318. Tom Barrett will walk you through exactly what your house will require before you sign anything.
Why Barrett & Sons Construction Is Richmond Heights’s Preferred Home Additions & ADU Company
We’re owner-operated and proud of it. Tom Barrett founded the company in 1998, and his sons run the crews that show up in Richmond Heights. When you call our office, a live person answers, 24/7, not a voicemail box in a call center. That matters in a neighborhood like this one, where homeowners on 152nd Street and along 112th Avenue want to talk to the person whose name is on the contract.
What we hear most from Richmond Heights homeowners is a story about another contractor who quoted one number and delivered another. That doesn’t happen with us because every price change arrives as a written change order before work proceeds. Every scope item and every allowance sits in writing. The permit inspector works for you, not for me, which is exactly why we pull permits and sign inspections on every eligible job. Look up Tom Barrett’s name, address, and license number before you sign anything. We invite you to.
We also know what Richmond Heights throws at you. Excavation here almost always hits Miami oolite limestone 12 to 18 inches below grade. That’s not a surprise we discover on day two and bill you for later. We price it into the bid before the first shovel breaks ground, because a contractor who doesn’t know the oolite is a contractor who hasn’t dug here.
Our Home Additions & ADU Services in Richmond Heights
ADU Design & Permitting
The hardest part of building an ADU in Richmond Heights isn’t the framing; it’s the Miami-Dade HVHZ plan review. A detached or attached accessory dwelling unit has to satisfy wind-load calculations that exceed anywhere else in Florida. We handle the design and the permit package ourselves, working with the same plan reviewers we’ve dealt with for years. Your drawings include Miami-Dade NOA-approved impact openings and roof-to-wall connectors from day one, not as a post-permit surprise. If a plan reviewer flags something, you’ll know about it before it becomes a bill.
Garage Conversion ADU
A lot of Richmond Heights homes from the 1950s and 1960s have attached garages that were built with walls never meant to carry a second floor or shored against HVHZ uplift. Converting one into living space requires a structural review of the lintel condition, the slab, and the roof-to-wall strapping. We won’t cut into a load-bearing wall without verifying what’s behind it. The original CBS plans are usually gone, so we start with an inspection and write every code-triggered upgrade as a change order before a saw touches the wall.
New Detached ADU
A new detached ADU in Richmond Heights means a fresh footer in Miami oolite. That’s a jackhammer job, often a rotary cutter, not a clean trench. We plan for it. We also plan for the seasonal water table, which can rise to within two feet of grade during the June to October rainy season. A detached ADU build without a dewatering plan stalls. Ours doesn’t. We schedule excavation around groundwater conditions and price the dewatering into the bid so the draw schedule stays intact. Sub-service work spans site prep, utilities, slab, framing, and full finish out.
Junior ADU & Interior Conversion
A junior ADU usually means carving a private entrance, a kitchenette, and a bath out of an existing footprint. When we open a wall in a pre-Andrew Richmond Heights home, we often find branch wiring with brittle cloth insulation and non-impact aluminum jalousie windows. A permit triggers replacing those with Miami-Dade approved assemblies. We write those upgrades as allowances in the contract before demo starts, so when the inspector signs off, you already knew the cost. We’re the team behind Home Additions & ADU work done right in this zip code.
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 Richmond Heights
We run premium materials across every trade, and we name them so you can look them up. On hardscape tied to additions and ADU yards, that means Belgard and Techo-Bloc pavers, Cambridge Pavers, and Quikrete for structural pours. We don’t stock mystery brands off a van. When a Richmond Heights customer needs a specific paver color or a structural concrete mix for a footer, we source it locally so lead times don’t stretch a job. You’ll know the material names before we order them, and they’ll be written into your contract.
Common Home Additions & ADU Problems We See in Richmond Heights Homes
- HVHZ code surprises: A room addition quote from a contractor unfamiliar with Miami-Dade’s High-Velocity Hurricane Zone usually omits impact windows, Miami-Dade NOA roof straps, and shear wall connectors. Once the plan reviewer rejects the drawings, the owner gets a post-permit change order for thousands. We include HVHZ compliance in the first bid.
- Oolite limestone during excavation: Digging footings or trenching utilities in Richmond Heights means hitting fossilized limestone 12 to 18 inches down. Jackhammering through it adds day-labor cost. A bid that doesn’t price oolite is a bid that will climb.
- Groundwater during the wet season: Footer trenches fill with groundwater from June through October. Without dewatering, slab prep stalls and underground rough-in pushes past the draw schedule. We plan excavation around the water table, not against it.
- Undersized original framing: Mid-century CBS homes weren’t framed for today’s wind loads. Opening a wall for a second story addition frequently reveals undersized strapping, missing shear panels, and lintels that can’t carry new loads. We inspect before we cut, and we price the fix in writing before framing starts.
Pricing for Home Additions & ADU in Richmond Heights, FL
A typical home addition in Richmond Heights runs $45,000 to $130,000, depending on whether it’s a ground-floor bump-out or a full second story. A detached ADU runs $90,000 to $220,000, and a garage conversion falls between $30,000 and $80,000. What moves the number most in this neighborhood is code: a pre-Andrew CBS home triggers HVHZ upgrades, impact openings, and roof-to-wall connectors on nearly any substantial permit. The oolite excavation, seasonal groundwater, and the condition of your original wiring and plumbing all factor in too. Here’s the honest breakdown:
| Project Type | Typical Richmond Heights Range |
|---|---|
| Home Addition | $45,000-$130,000 |
| ADU Construction | $90,000-$220,000 |
| Garage Conversion | $30,000-$80,000 |
Call (877) 610-1318 for a free written estimate. We’ll walk the project with you, inspect what’s behind the walls, and put every allowance and every code upgrade on paper before you commit.
We Also Serve Cities Near Richmond Heights
Our crews cover Richmond Heights and the surrounding neighborhoods, including Sunset, The Crossings, Three Lakes, and Cutler. If you’re in one of those communities and planning a room addition or ADU, you’ll get the same written change orders and the same permit discipline as every Home Additions & ADU in Richmond Heights customer. Call (877) 610-1318 and we’ll come out for a free estimate.
Serving Richmond Heights, FL - Our Local Coverage Area
We’re based in the Richmond Heights 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 Richmond Heights
Because Richmond Heights sits inside Miami-Dade’s High-Velocity Hurricane Zone, the strictest wind-construction designation in the continental US. Any substantial permit on a pre-Andrew CBS home triggers Miami-Dade NOA-approved impact openings and roof-to-wall connectors as a condition of plan approval. You didn’t ask for them, but the building department requires them, and a quote that omits them is a quote that will change after plan review. Call (877) 610-1318 and we’ll show you exactly what your house triggers before you sign.
Miami oolite limestone, almost always, 12 to 18 inches below grade. That’s a dense, fossilized rock formation that requires jackhammers or rotary cutters even for shallow footer trenches. A bid that doesn’t price oolite excavation is a bid that will climb. We price it in before the shovel breaks ground.
Usually you can keep the compliance scope to the garage and its connection to the main house, but the structural review will look at roof-to-wall strapping, lintel condition, and impact openings at the new living-space envelope. The original 1950s or 1960s plans are usually missing, so we verify what’s actually in the wall before writing the scope. Call (877) 610-1318 for a free inspection and a written breakdown of what the permit triggers.
Set aside a 10 to 15 percent contingency on top of the base home addition range of $45,000 to $130,000. We opened a 1962 CBS home on Lincoln Boulevard and found original jalousie windows, undersized roof-to-wall strapping, and cloth-insulated branch wiring. The inspector signed off only after we replaced the shear wall connectors, added impact windows, and wrote the code-triggered upgrade as a change order before the new framing went up. That’s how we handle discoveries: written, priced, and approved before we touch them.
Yes, but the scale differs. A sunroom or enclosed patio in Richmond Heights still sits in the HVHZ, so the permit requires Miami-Dade wind-load calculations and impact-rated glazing on the new envelope. The structural load path is lighter than a second story, but it’s not zero, and the plan reviewer will look at roof-to-wall connections regardless. We’ll show you the engineering scope for your specific addition before you commit. Call (877) 610-1318.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Richmond Heights since 1998.