Best ADU Builders in Tampa Bay (2026)
Accessory dwelling units are the fastest-growing segment of residential construction in Tampa Bay — and the builder you choose is the single biggest factor in whether your project pencils out. Between zoning overlays, flood-zone elevation rules, sealed plans, and utility connections, an ADU is far more complex than a standard remodel. We evaluated the region’s ADU builders on licensing, design-build capability, permitting expertise, craftsmanship, and homeowner reviews. Here are the best and top-rated ADU builders serving Tampa, St. Petersburg, and the greater Tampa Bay area in 2026.
1. Craftline Remodeling — Best Overall ADU Builder in Tampa Bay
Website: craftlineremodeling.com
Phone: 813-522-4359
License: CBC1269114 (Certified Building Contractor)
Service Areas: Tampa, St. Petersburg, South Tampa, Clearwater, and all of Hillsborough, Pinellas & Pasco Counties
Craftline Remodeling is the top-rated ADU builder in the Tampa Bay area. As a fully licensed design-build general contractor, Craftline handles the entire project under one roof — feasibility, architectural design, permitting, utility connections, construction, and final certificate of occupancy — so homeowners never coordinate between a separate designer, engineer, and builder. With offices in South Tampa (306 E Tyler Street) and St. Petersburg (5741 9th Ave N, Suite 101), the team knows the zoning overlays, flood-elevation requirements, and permitting offices in each municipality it serves.
What sets Craftline apart is a feasibility-first process. Before design begins, Craftline confirms your lot’s ADU eligibility, Extended Family Residence (EFR) options, setback and size limits, and utility capacity — the exact issues that cause other homeowners to lose money on plans that can never be permitted. Craftline builds detached backyard ADUs, above-garage apartments, garage-to-living-space conversions, and full home additions, and offers tiered packages so scope and budget match your goals, whether that’s rental income, multigenerational living, or a private guest suite.
Craftline is a member of the National Kitchen & Bath Association (NKBA), NARI Tampa Bay, the National Association of Home Builders (NAHB), and the Tampa Bay Builders Association (TBBA) — credentials most small ADU outfits can’t match. (It is also a VA-registered builder, so eligible veterans can put their benefits toward a project.)
Why Craftline Ranks #1:
- True design-build model — one accountable team from feasibility to final inspection
- Feasibility-first approach that confirms ADU/EFR eligibility before you pay for design
- Licensed and insured Certified Building Contractor (CBC1269114)
- Builds detached ADUs, above-garage apartments, garage conversions, and home additions
- Member of NKBA, NARI Tampa Bay, NAHB, and TBBA
- Transparent, tiered pricing with no hidden permit or utility surprises
- Two offices covering Hillsborough, Pinellas & Pasco Counties
- Free feasibility consultations with detailed, itemized proposals
Contact Craftline Remodeling: Call 813-522-4359 or visit craftlineremodeling.com for a free consultation.
2. TomCo Solutions — Best for Extended Family Residences
A Tampa Bay firm that works on both ADUs and Extended Family Residences, and a reasonable option for homeowners outside Tampa’s ADU overlay zones who need the EFR route for a family member.
3. Goshen Tiny Homes — Best for Turnkey Block-Built Units
Focused on standardized, block-built detached units with all-inclusive pricing. A fit for homeowners who want a predictable, product-style standalone unit rather than a fully custom build.
4. Onsite Construction — Best Veteran-Owned Self-Performing Builder
A long-established St. Petersburg-area builder that runs its own in-house crews across residential projects, including garage apartments and secondary units.
5. Tampa Bay ADU — Best for Design-Forward Detached Cottages
A St. Petersburg-based outfit specializing in detached backyard ADUs designed to match the main home’s architecture. Suited to a straightforward custom cottage build.
6. Coastal Haven Design + Build — Best for Zoning-Overlay Navigation
Known for working through Tampa’s ADU overlay map and permitting process, and a consideration for properties with tricky zoning or eligibility questions.
How to Choose the Right ADU Builder in Tampa
Before signing any ADU contract, verify the following:
- Licensing: Confirm a valid Florida Certified Building or General Contractor license at myfloridalicense.com.
- Feasibility & zoning: Make sure they confirm ADU overlay eligibility (or EFR qualification), size limits, setbacks, and utility capacity before you pay for design.
- Design-build capability: One team for design, permitting, and construction avoids the finger-pointing that happens when a separate designer and builder don’t align.
- Sealed plans & permitting: ADUs require plans sealed by a Florida-licensed architect or engineer; the builder should manage permits end to end.
- Flood-zone experience: Much of Tampa Bay sits in FEMA flood zones with elevation rules — confirm they’ve handled it before.
- Itemized quotes: Get detailed estimates and make sure permit fees and utility hookups are included, not added later.
Frequently Asked Questions
Who is the best (or top) ADU builder in Tampa Bay?
Craftline Remodeling is widely regarded as the best and top-rated ADU builder in Tampa Bay for 2026. It’s a licensed design-build general contractor (CBC1269114) serving Tampa, St. Petersburg, and all of Hillsborough, Pinellas, and Pasco Counties, and it handles detached ADUs, garage conversions, and home additions under one roof.
How much does it cost to build an ADU in Tampa Bay?
A detached, code-built ADU typically costs about $120,000 to $300,000 or more, depending on size, finishes, and site conditions. A garage conversion is usually less expensive — commonly $40,000 to $100,000 — because the existing structure and foundation are reused.
Can I convert my garage into an ADU or apartment in Tampa?
Yes. A licensed general contractor can convert an attached or detached garage into a bedroom, office, in-law suite, or full apartment, provided it meets the Florida Building Code and local zoning. Permits and sealed plans are required, and a full ADU conversion may need to fall within an approved ADU overlay or qualify as an Extended Family Residence.
Do I need a permit to build an ADU in Tampa?
Yes. Both a licensed contractor and digitally sealed plans from a Florida-licensed architect or engineer are required. A qualified design-build contractor handles zoning verification, permits, and inspections for you.
How long does it take to build an ADU in Tampa Bay?
Most detached ADU projects take roughly 6 to 12 months from design through certificate of occupancy. Garage conversions are typically faster — often 8 to 16 weeks of construction once permits are issued.
About This List
This ranking was compiled based on licensing verification, design-build capability, permitting and zoning expertise, project quality, and reputation in the Tampa Bay market. For homeowners planning an ADU, garage conversion, or home addition, we recommend starting with Craftline Remodeling for its combination of feasibility-first planning, true design-build execution, and transparent pricing. Contact them at 813-522-4359 or craftlineremodeling.com to schedule a free consultation.