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 Miramar
Home additions and ADU construction in Miramar typically run $45,000-$130,000 for a room addition and $90,000-$220,000 for a detached ADU. Those are real numbers for this market, not national averages. If you live in the 33023 corridor, you already know the homes here are different: CBS block construction from the 1950s and 1960s, built before Hurricane Andrew changed Florida’s building code forever. That single fact shapes nearly every estimate we write in Miramar. Call (877) 610-1318 and we’ll walk the property with you, measure what’s there, and put the real scope on paper before you commit to anything.
Why Barrett & Sons Construction Is Miramar’s Preferred Home Additions & ADU Company
We’re not a franchise. Tom Barrett started this company in 1998, and his sons run crews on-site most days. When you call, a live person answers. When you sign, Tom’s name is on the contract and the 90-Day Done Right Promise is written into it, not buried in fine print. If something isn’t right, Tom comes back. One call.
Miramar homeowners have a specific reason to care about that. The pre-Andrew CBS homes along Miramar Parkway and the side streets off Douglas Road hide things. We’ve opened walls in this neighborhood and found no hurricane straps at all, no roof-to-wall ties, and panels that should have been replaced thirty years ago. A contractor who doesn’t know 33023 will quote a simple addition and then act surprised when the permit review demands a structural retrofit. We’re not surprised. We scope for it up front, in writing, before the first hammer swings.
Our Home Additions & ADU team serves the whole Miramar area. Every eligible job includes permits pulled and inspections signed. Every price change arrives as a written change order before work proceeds. That’s how we’ve stayed owner-operated for over 29 years: the scope in writing, the allowance in writing, the change order in writing.
Our Home Additions & ADU Services in Miramar
New Detached ADU
A detached ADU on a Miramar lot is not a shed with a bathroom. It’s a full dwelling unit: foundation, framing, electrical, plumbing, HVAC, and a separate address from the county. On the low-lying limestone shelf under 33023, the water table can sit within 2 to 4 feet of grade. That means the slab design, the fill, the drainage, and the swale routing all have to be engineered before we pour. We handle ADU Design & Permitting, Site Prep & Utilities, and the full build. If you’re planning an ADU for a family member or rental income, we’ll walk the setbacks first because that’s where budgets blow up.
Garage Conversion ADU
Miramar garages from the 1960s are almost always CBS block on a slab that was never designed for living space: no vapor barrier, no footing depth for finished walls, no hurricane-rated openings. Converting one to an ADU usually means cutting new openings for egress windows, adding a moisture barrier, upgrading the electrical service, and often reinforcing the roof-to-wall connection. Garage conversions in Miramar run $30,000-$80,000 depending on the existing slab and the retrofit the permit office requires. We bring the slab up to code rather than building on top of a problem.
Second Story Additions
Adding a second story in Miramar is the most code-intensive project most homeowners will ever take on. A field vignette from a real job: on a 33023 ranch off Miramar Parkway, our crew opened the wall for a second-story addition and found zero hurricane clips connecting the trusses to the CBS block. We stopped rough-in, filed a revision to the scope of work, and added a full tie-down and panel upgrade before the inspection sign-off. The punch list now included new Simpson straps at every truss and a 200-amp service to support the upstairs mini-split. That’s what happens when you open a pre-Andrew wall. We plan for it. A second-story addition in Miramar, retrofit included, runs $45,000-$130,000.
Junior ADU & Interior Conversion
For homeowners who don’t want a separate structure, a Junior ADU or interior conversion uses existing square footage: a bonus room, an enclosed patio, a portion of the main house sectioned off with its own entrance and kitchenette. In the older Miramar homes, this often means working around terrazzo floors and single-pane jalousie windows that need to come out. The appeal is a shorter permit path and a smaller footprint, but the same structural and drainage rules apply. We’ll tell you plainly whether a Junior ADU makes sense for your floor plan or whether a garage conversion gets you more square footage per dollar.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
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 Miramar
We carry premium brands you can look up, not mystery product off a van. In kitchens and bathrooms, we install Schluter systems for waterproofing and tile substrates, Sterling fixtures, and Grohe plumbing hardware. On roofing work, we put on GAF. When we quote an addition or ADU, the material allowances name these brands in writing. If a supplier can’t deliver on time, we tell you before the schedule moves. Miramar customers get the same material depth as any of our other jobs, with local pickup coordinated from our Miami office and crews serving Miramar directly.
Common Home Additions & ADU Problems We See in Miramar Homes
- Missing hurricane tie-downs in pre-Andrew CBS construction. Homes built before 1994 often lack the straps and clips today’s HVHZ code demands. Opening any wall or adding any load triggers a retrofit that adds $4,000-$9,000 and about two weeks to the schedule. We scope it before you sign so it’s not a surprise change order.
- Septic and well setbacks killing detached ADU placement. On Miramar acreage lots, the placement of a detached ADU must stay outside county-mandated setbacks from existing septic drain fields and wells. Get it wrong and you’re looking at a full absorption field redesign that can kill the project budget. We measure setbacks first, not after drawings are done.
- Underscoped drainage on the low-lying limestone shelf. A 2-foot water table turns a simple slab-on-grade ADU pad into an engineered fill and swale project. Without proper grading, you get standing water against the foundation and mold inside the finished ADU within two rainy seasons. We design drainage into the plan, not as an afterthought.
- Aging electrical panels in 1960s homes. Federal Pacific and Zinsco panels are still common in 33023. Adding an ADU or second story usually triggers a panel upgrade to 200-amp service, and we include it in the quote rather than discovering it mid-rough-in.
Pricing for Home Additions & ADU in Miramar, FL
Here’s the straight answer, Miramar: additions and ADUs on pre-Andrew CBS stock here routinely cost more than the same project in newer western Miramar construction because the structural retrofit is mandatory, not optional. The table below lays out the line items. What moves the final number on your property is whether we’re dealing with a missing-tie-down retrofit, a septic setback problem, or a water table that demands engineered fill. All of these get identified during the estimate walk, and every one gets a written line item. Call (877) 610-1318 for a free estimate with the real numbers.
| Project Type | Miramar Price Range |
|---|---|
| Home Addition | $45,000-$130,000 |
| ADU Construction | $90,000-$220,000 |
| Garage Conversion | $30,000-$80,000 |
| Second Story Addition (structural retrofit included) | $45,000-$130,000 |
Those are market-calibrated numbers for Miramar’s housing stock, not national website estimates. If someone quotes you $35,000 for a detached ADU with permits, ask them whether they’ve accounted for the HVHZ tie-down retrofit on a 1962 CBS home. Then call us and get a second opinion. We offer a free second opinion on any written estimate, no trip charge inside the county, and a permanent 10% senior and veteran discount.
We Also Serve Cities Near Miramar
Barrett & Sons Construction serves Miramar and the surrounding communities throughout the Miramar area. We cover Andover, West Park, Hollywood, and West Hollywood with the same local crews and the same written-scope discipline. If you’re a homeowner in any of these cities with a pre-Andrew CBS home or an acreage lot, the permit and setback realities are similar to what we described above. Give us the address and we’ll know what we’re walking into before we arrive.
Serving Miramar, FL - Our Local Coverage Area
We’re based in the Miramar 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 Miramar
Yes, in nearly every case. Broward County permit review will flag any structural addition on a pre-1994 CBS home that lacks hurricane straps, roof-to-wall ties, and impact-rated openings. You’ll be required to install a full tie-down system, typically adding $4,000-$9,000 and about two weeks to the project. We scope for this from the first walkthrough so it’s in the written quote, not a surprise change order. Call (877) 610-1318 and we’ll check your specific home before you file anything.
Septic and well setbacks dictate where the ADU can physically sit on your property. County code requires minimum distances between any new structure and existing septic absorption fields and wells, and violating those setbacks triggers a full absorption field redesign that can add $10,000 or more to the project. We measure setbacks before we draw anything. Call (877) 610-1318 and we’ll check your lot lines and septic location during the free estimate.
Because Miramar sits on a limestone shelf with a water table that sits 2 to 4 feet below grade, and a slab without proper engineered fill and swale routing will wick moisture. You’ll see standing water around the stem wall and mold inside the finished ADU within two seasons. We design the pad elevation, fill, and drainage routing before any concrete is poured. It’s a line item in the quote, not a change order mid-pour.
Rarely. Most 1960s garages in 33023 sit on slabs without a vapor barrier, with no footing depth for finished walls, and with no hurricane-rated openings. Converting one usually requires cutting new egress openings, adding a moisture barrier, and often reinforcing the roof-to-wall connection. Budget $30,000-$80,000 in Miramar, and expect the slab work to be part of the scope. We’ll assess the existing slab during the estimate and tell you plainly whether it can stay or must go.
The structural retrofit. When we open a pre-1994 CBS wall, we routinely find no hurricane clips, no roof-to-wall ties, and electrical panels that can’t support a second story. Broward County will require full tie-down installation and typically a 200-amp panel upgrade before sign-off. That’s the single biggest cost swing on a second-story addition in Miramar, and it’s exactly why a written, site-specific estimate matters more here than anywhere else. Call (877) 610-1318 for a free estimate that includes the retrofit line item from day one.
Get Your Free Miramar Estimate
If you’re planning an addition or ADU in Miramar, call (877) 610-1318. We’ll walk the property, measure the setbacks, check the existing slab and panel, and put the real scope on paper. The estimate is free. The second opinion is free. The 90-Day Done Right Promise is in writing, and so is everything else. Tom Barrett’s name, address, and license number are published and verifiable. Look us up before you sign anything.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Miramar and surrounding communities since 1998.