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 West Miami
Home additions and ADU construction in West Miami, FL typically runs $53,100-$153,400 for a room addition, and $106,200-$259,600 for a detached ADU, with garage conversions landing between $35,400-$94,400. If you’re weighing a second-story addition on a 1950s CBS ranch or trying to figure out whether your lot can even accommodate a detached unit, call (877) 610-1318 for a straight answer and a free estimate. The single biggest factor most people don’t see coming in West Miami is that the city runs its own building department, separate from Miami-Dade County.
We’ve pulled permits in West Miami enough times to know exactly where the city line falls, which is more than most contractors can say, because two houses on the same block can answer to two different permitting authorities. Tom Barrett and his sons handle every job with the same approach: scope in writing, allowances in writing, change orders in writing. No surprises at the final walkthrough.
Why Barrett & Sons Construction Is West Miami’s Preferred Home Additions & ADU Company
Barrett & Sons is the owner-operated, name-on-the-truck alternative to the out-of-town outfits that quote one number on the phone and hand you a different bill at the door. Tom Barrett founded the company in 1998, and his sons run the crews on-site most days, which means the person you shake hands with is the same person who stands behind the work when it’s done. The Home Additions & ADU team doesn’t dispatch strangers from a call center; the crew members who show up in West Miami carry the Barrett name and have been background-checked and uniformed on every visit.
West Miami is one of Florida’s smallest incorporated municipalities, and it maintains its own fully independent building department. Contractors unfamiliar with the area routinely pull county permits for jobs inside city limits, and that triggers stop-work orders faster than you’d believe. We know the difference. Every permit we pull for West Miami jobs goes through the City of West Miami, not Miami-Dade County, and every inspection gets signed before we call the job complete. The permit inspector works for you, not for me, that’s why I like him. Tom publishes his name, address, and license number, so look it up before you sign anything, and ask anyone on your block about us while you’re at it.
Our Home Additions & ADU Services in West Miami
ADU Design & Permitting
Before a single block gets laid, the ADU has to clear West Miami’s zoning, setbacks, and the HVHZ wind-resistance requirements that apply to every newly permitted structure in Miami-Dade County. We handle the full design and permitting path for ADUs in West Miami, which means the plans get drawn to meet the Florida Building Code’s most stringent wind provisions on the first pass. Most of the mid-century lots around SW 8th Street are compact, so lot coverage and rear-yard setbacks often become the deciding factors in whether an ADU works at all.
Garage Conversion ADU
Converting an existing garage is one of the most budget-efficient ways to add a rentable unit or in-law suite to a West Miami home, with most conversions running $35,400-$94,400 depending on whether you’re keeping the existing slab and walls or rebuilding portions to meet current code. The 1950s and 1960s CBS construction in West Miami makes for a solid shell, but undersized electrical panels are common, which means a panel upgrade is often baked into the real scope of a garage conversion. We bring every allowance and change order to you in writing before work happens, because an allowance that isn’t on paper is a surprise waiting for a date.
New Detached ADU
A new detached ADU in West Miami starts around $106,200 and can climb past $259,600 when you add impact-rated openings, upgraded finishes, and site work. All of West Miami sits inside the High Velocity Hurricane Zone, so every window, door, and roof-to-wall connection on a detached ADU must carry Miami-Dade product approvals, which adds cost and lead time compared to jobs in other parts of Florida. Our Home Additions & ADU team specifies impact-rated products from PGT, CGI, and Simonton as standard on these builds, not as an upsell.
Junior ADU & Interior Conversion
For homeowners in West Miami who don’t want to disturb the footprint of their ranch home, a junior ADU can be carved out of existing square footage, often a rear bedroom or a den with its own exterior access. This approach avoids the lot-coverage constraints that plague compact West Miami parcels and typically keeps the budget on the lower end of the range. We also handle Kitchen Remodeling in West Miami and Bathroom Remodeling in West Miami when an interior conversion includes either space, which it often does in these older homes.
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 West Miami
We install and service premium-brand materials you can look up, not mystery brands off a van. In West Miami’s HVHZ, the window and opening protection specs matter more than almost anywhere else in the country, so we lean on PGT, CGI, and Simonton for impact-rated windows and doors that carry Miami-Dade product approvals. When you call us for a home addition or ADU in West Miami, you’ll see the brand names on your written quote before work starts, and we’ll walk you through why we chose each product for your specific lot and exposure. For finish work inside the new space, we carry KraftMaid and Cambria lines that let you match cabinets and countertops to the rest of the house rather than settling for builder-grade placeholders.
Common Home Additions & ADU Problems We See in West Miami Homes
- Wrong-permit stop-work orders. Because the West Miami city boundary cuts through the middle of some residential blocks near Red Road and the SW 8th Street corridor, a house on one side of the street falls under West Miami’s building department while the house across the street falls under Miami-Dade County. Contractors who file with the county for a West Miami parcel get red-tagged, and the homeowner is the one who pays for the delay.
- Undersized electrical panels on mid-century builds. Many of the 1950s and 1960s CBS ranch homes in West Miami still carry their original 100-amp panels, which cannot support a modern ADU or a second-story addition with a heat pump and electric appliances. A panel upgrade becomes a required line item, and we put it in the written scope before you sign.
- HVHZ product approval mismatches. Not every “impact window” sold in Florida meets Miami-Dade’s High Velocity Hurricane Zone requirements. We’ve walked onto West Miami jobs where the previous contractor installed windows with the wrong product approval for this specific jurisdiction, and the inspection failed on the spot. We specify PGT, CGI, or Simonton lines that carry the correct approvals from the start.
- Foundation and slab questions on compact lots. West Miami lots are small, and the original CBS construction sits on slabs that have seen six decades of South Florida moisture. Before we plan any room addition or detached ADU, we verify what the slab can support and whether the added structure needs additional footings, because that’s a real cost driver the cheap bids leave out entirely.
Pricing for Home Additions & ADU in West Miami, FL
Here’s what you should budget in West Miami. A room addition typically runs $53,100-$153,400, a garage conversion ADU lands between $35,400-$94,400, and a new detached ADU runs $106,200-$259,600. The HVHZ requirements in West Miami add cost on almost every job because impact-rated openings, enhanced roof-to-wall connections, and Miami-Dade product approvals are non-negotiable here, and a permit pulled through the City of West Miami follows its own fee schedule separate from the county’s. A junior ADU or interior conversion can come in at the lower end when the existing structure and panel are sound.
Every estimate we write for West Miami homeowners is a written, line-item scope, not a phone number with a handshake. Call (877) 610-1318 for a free estimate on your addition or ADU, and we’ll put the numbers in front of you before you commit to anything.
We Also Serve Cities Near West Miami
Our crews work throughout the surrounding neighborhoods, so if you’re in Flagami, Westchester, Coral Terrace, or Fountainebleau, the same West Miami team that knows this city’s permitting quirks can handle your project. The jurisdictional line matters just as much in those adjacent areas, and we verify every parcel before filing. Call (877) 610-1318 and tell us your cross streets, and we’ll tell you which building department governs your address.
Serving West Miami, FL - Our Local Coverage Area
We’re based in the West Miami 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 West Miami
After we complete the design and permitting package, most West Miami addition and ADU projects can break ground within a few weeks of permit approval, but the City of West Miami’s independent building department sets its own review timelines, so we quote a start window based on the current queue when we write your estimate. Call (877) 610-1318 and we’ll tell you what the current wait looks like for your specific scope, and the estimate is free.
Yes, we serve the entire city of West Miami, zip code 33144, including the blocks that border Flagami, Westchester, Coral Terrace, and Fountainebleau, and we verify every parcel against West Miami’s official boundary map before filing a permit. This matters especially along the edges of the city where the municipal line cuts through residential streets. Call (877) 610-1318 with your address and we’ll confirm which building department governs your lot.
No, not without your written approval. Every scope change, every allowance adjustment, and every unexpected condition gets issued as a written change order before the work proceeds, and you sign it before we move. That’s the Barrett & Sons rule in West Miami and everywhere else we work, and it’s why our customers don’t get surprise invoices at the end. Call (877) 610-1318 for a fixed, line-item estimate.
Yes, and every eligible job includes permits pulled through the City of West Miami building department and inspections signed before we close the job out. The permit inspector works for you, and we like it that way, because a signed inspection is the proof the work was done to code. Call (877) 610-1318 if a previous contractor told you permits were optional, and we’ll tell you what a legal job actually requires.
Every Barrett & Sons construction and remodeling job carries the 90-Day Done Right Promise, written on the contract, not buried in fine print. If something isn’t done right, Tom comes back and makes it right with one call. After 90 days, the manufacturer warranties on PGT, CGI, Simonton, and the other premium-brand products we install remain in effect for the life of their terms. Call (877) 610-1318 for a precise quote on your West Miami project.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Home Additions & ADU in West Miami with permits pulled, change orders in writing, and the 90-Day Done Right Promise on every job.