Central Florida ADU Builders: How to Choose the Right One

The hardest part of building an accessory dwelling unit in Central Florida isn’t permitting and it isn’t financing. It’s picking a builder. Permitting has a process. Financing has an APR. Picking a builder is a judgment call with tens of thousands of dollars riding on it, and you don’t want to pick wrong and find out eighteen weeks later.

This page is the reference we wish we’d had before hiring. It covers the different kinds of builders working in Central Florida, the license a contractor is legally required to hold on your property, what a real proposal looks like, the pricing structures you’ll see quoted, the red flags that can end a conversation, and the Florida-specific contract language you should refuse to sign without. There’s no vendor ranking here. The market moves too fast for a static list to stay honest. A shop that was excellent in 2024 can lose its lead superintendent in 2025 and be a mess by 2026. The vetting method doesn’t change even when the players do, and that’s what this page is actually about.

The five types of builders who will quote your ADU

The Central Florida ADU market doesn’t have a single archetypal builder. Five different business models compete for the same jobs, and the differences matter more than most homeowners realize when they’re collecting bids.

Custom home builders adding ADUs as a secondary line. These are shops that built their reputation on 3,000–6,000 sq ft single-family homes in Winter Park, Baldwin Park, Lake Nona, and Winter Garden, and added ADUs to the menu because enough existing clients asked. Their price per square foot is usually the highest of any category, since their overhead was built for bigger jobs, but their finish quality and project management are usually the best, too. Worth the premium if you want a 900 sq ft ADU that looks and feels like the primary house and you’re not in a hurry on budget. A poor fit if you’re building a bare-bones rental unit on a tight number.

ADU-specialist shops. A small number of Central Florida firms have built their entire business around ADUs, most of them started in 2023–2024 once homeowners began asking for them in real volume. These specialists usually offer a defined product line (three or four floor plans at fixed prices), have already worked through the permitting quirks of every major county, and can move fast because they’re not juggling a 4,800 sq ft custom home on the same calendar. Price per square foot is usually the lowest of any build category here. The trade-off: you’re often choosing from a menu instead of designing from scratch, and some of the newer entrants are thinly funded. Ask to see their last twelve months of certificates of occupancy and verify a few yourself in the county building department records.

Generalist licensed general contractors. Any Florida Certified General Contractor (CGC) or Certified Residential Contractor (CRC) can legally build an ADU, and a meaningful share of Central Florida ADUs are built by generalist GCs on their second or third one, not their fiftieth. They’re a reasonable fit if you’re comfortable managing more of the process yourself (selecting finishes, sourcing appliances, chasing down the surveyor, walking the inspector through when the GC can’t be there) and you already have a good set of drawings from an architect you hired separately. Prices and quality both vary wildly here. The verification steps and red-flag list later on this page apply directly to this group.

Modular and factory-built assemblers. A growing share of Central Florida ADUs are modular units built off-site (often in Georgia or Alabama) and set on a site-built foundation. The assembler you’re contracting with isn’t the manufacturer; they’re the local licensed contractor handling site prep, foundation, utility hookups, set day, and final inspections. Schedule certainty is generally better with modular, since weather delays only touch the site-built portion, and per-square-foot pricing tends to run lower for comparable finishes. The trade-off is design inflexibility: you’re picking from the manufacturer’s model line. If your lot has access constraints (narrow side yards, overhead wires, not enough swing room for the crane), modular may not work at all. Confirm crane access during the site walk. Not after the deposit clears.

Owner-builder with a subcontractor stack. Florida law lets a homeowner act as their own contractor on their own residence under the owner-builder exemption in § 489.103(7), Fla. Stat., hiring and coordinating licensed subcontractors trade by trade. Done right, it can save 15–25% of total project cost, in exchange for taking on the coordination work, the schedule risk, and the liability yourself. It’s a legitimate path if you have construction experience, or the time to build it fast. It’s a bad path if you haven’t read Chapter 713, Fla. Stat. (construction liens) end to end, or don’t have a plan for lien waivers, Notice to Owner responses, and pay applications. The owner-builder exemption isn’t a shortcut around the rules. It’s taking on the GC’s job yourself.

The license your contractor must legally hold

Florida is a state-licensed contracting jurisdiction. The Department of Business and Professional Regulation (DBPR), through its Construction Industry Licensing Board, issues and enforces contractor licenses. There’s a handful of license types, each with two tiers.

Certified vs Registered. A certified license is valid statewide. A registered license is only valid in the local jurisdiction (county or municipality) that accepted the contractor’s competency exam, plus any others with reciprocal agreements. For an ADU, you want a certified license holder unless you’ve confirmed the registered license is valid in your specific county. If you’re in a border area (east Osceola near Brevard, say), a registered license in one county doesn’t automatically carry over to the next. Certified is just safer.

License class. For a residential ADU, the relevant classes are:

• Certified General Contractor (CGC / CG-). Can build anything, any height. Overqualified for most ADUs but fully legal.
• Certified Building Contractor (CBC). Commercial and residential buildings up to three stories. Legal for ADUs.
• Certified Residential Contractor (CRC). One-, two-, or three-family residences up to three stories. The most common ADU license class and the one you’ll see most often.
• Registered Residential Contractor (RR). Same scope as CRC but local-only.

Licenses that do not qualify someone to build your ADU, even though they sound related: roofing (CCC), plumbing (CFC), electrical (EC), air conditioning (CAC), pool/spa (CPC), specialty (various). A roofer isn’t licensed to build your ADU even if they’re also framing the roof on it. The general or residential contractor is the one pulling the permit and holding responsibility for the whole job.

Verification. Every Florida contractor license is searchable at MyFloridaLicense.com by name or license number. Before you sign anything, verify three things on that portal: (1) the license is active and current (not expired, not under discipline); (2) the license class is appropriate (CGC, CBC, CRC, or RR); and (3) the qualifying agent named on the license is the same person you’ve been negotiating with, or an officer of the company you’re contracting with. A common scam in Florida is a handyman or unlicensed builder operating under someone else’s license number: a relative’s, a former employer’s. If the qualifier doesn’t match, walk. Full walkthrough in our guide on verifying a Florida contractor’s license.

Local business tax and insurance on top of the state license. The state license is necessary but not sufficient. Most counties and cities in Central Florida also require a local business tax receipt (the old “occupational license”) before a contractor can pull permits, and every building department will want to see general liability insurance and either workers’ compensation coverage or a valid FL-WCE exemption certificate for each person on site. If your builder can’t produce these on request, they’re either not legitimate or not ready to work in that county.

Insurance, workers’ comp, and why it matters to you

A licensed Florida contractor has to carry general liability insurance at minimums set by their license class. Under DBPR rule, that floor is $100,000 public liability / $25,000 property damage for a Certified Residential Contractor (the most common ADU license class) and $300,000 public liability / $50,000 property damage for a Certified General or Building Contractor — though many legitimate builders carry $1M/$2M policies well above the floor. Ask to be named as an additional insured on the policy for the length of the project. Legitimate builders do this without blinking. Any pushback is a red flag.

Workers’ compensation is where homeowners get into real trouble in Florida. Under § 440.10, Fla. Stat., if a worker is hurt on your property and the contractor they work for doesn’t carry workers’ compensation coverage, you as the property owner can be held liable for the injury as a statutory employer. That’s not theoretical — it’s how homeowners end up on the hook for a six-figure comp claim after somebody falls off a roof. The fix is simple: every contractor on the job, and every subcontractor they bring, either carries workers’ compensation coverage (verify at the Florida Division of Workers’ Compensation Proof of Coverage search) or holds a valid exemption certificate as a corporate officer of their own company (same portal). Keep copies of the certificates in your file before anyone sets foot on the property.

What a real ADU proposal contains

Most of the proposals homeowners forward us for review fail a basic inspection. They’re one-page PDFs with a scope summary, a total dollar figure, and nothing underneath the total. That’s not a proposal. A real ADU proposal from a competent Central Florida builder contains:

A fixed-price scope itemized to the trade. Foundation, framing, roofing, siding, windows and doors, HVAC, electrical, plumbing, insulation, drywall, interior finish, cabinetry, counters, flooring, appliances, exterior finish, landscaping restoration, site cleanup. Each trade has a dollar figure. You should be able to look at the HVAC line (say, $7,800) and judge for yourself whether that matches your own research on a 1.5-ton mini-split install for a 600 sq ft unit.

An allowance schedule for finish-level choices. Cabinets, counters, flooring, lighting, plumbing fixtures, appliances: these are typically quoted as allowances because the homeowner hasn’t chosen exact models yet. The allowance is a budget. Spend more than the allowance at the showroom and you pay the difference. Spend less and you get the difference back. A real proposal shows the allowance for each category so you can tell whether the contractor priced cheap builder-grade or mid-tier finishes.

A draw schedule tied to verifiable milestones. Payment is not a percentage of time passed. It’s a percentage of work completed. A reasonable draw schedule for a 600 sq ft detached ADU on a 20-week build looks like: 10% at contract signing, 15% at foundation complete and inspected, 20% at framing dried in and rough inspections passed, 20% at rough mechanicals complete and inspected, 15% at drywall and interior finish, 15% at final punch list and certificate of occupancy, 5% retainage released thirty days after CO. Anything front-loaded beyond 10–15% before work starts is a financing ask dressed up as a deposit.

A calendar. Start date, substantial completion target, float for weather. Ten weeks is aggressive, fourteen is normal, twenty is honest.

A change-order procedure. How changes are priced, how they get approved in writing, what the markup is on change-order work (typically 15–20% over cost). If the proposal doesn’t say, assume the contractor will bill you whatever they feel like.

Warranty terms. Florida has a seven-year statute of repose on construction-defect claims under § 95.11(3)(b), Fla. Stat. (shortened from ten years by a 2023 law), but most contractors offer a shorter express warranty: typically one year workmanship, two years systems, ten years structural. Know what you’re getting before you sign.

License number, insurance certificates, and workers’ comp proof attached or referenced. If these aren’t in the proposal packet, ask before you negotiate price.

If a proposal is missing more than one of these, the problem isn’t that the contractor forgot something. The problem is that this is how they’ll run the job.

Red flags that should end the conversation

The following patterns, in our observation of Central Florida ADU builds, are reliable predictors of trouble. None of them guarantee the builder is bad. All of them should make you slow down and ask more questions.

A door-to-door sales pitch. A deposit requirement above 10% of the contract. A request to be paid in cash, or to a personal account rather than a business account. A refusal to provide a license number in writing. A license number that doesn’t match the contracting entity at MyFloridaLicense. A qualifier listed on the license who isn’t involved in the job. No physical business address, or an address that turns out to be a residential home or a mailbox service. No reviews older than twelve months on any platform. Reviews that all showed up within a short window. Aggressive pressure to sign “today” to lock in a price. A contract that waives your right to file a claim with the Florida Homeowners’ Construction Recovery Fund. A contract that requires arbitration outside Florida. No signed lien waiver at each draw. A refusal to let you contact past clients directly. Subcontractors who aren’t named, or who change mid-project without notice. A proposal where the contract sum is lower than the sum of the itemized trade lines (yes, this happens — it’s a math error the contractor is hoping you won’t catch, and it usually resurfaces in change orders).

Don’t trust the “we’ll build it for less than a permit” quote. Florida contractors who offer to build an ADU for materially less than the permit and impact fees in your county are almost always planning to skip the permit. An unpermitted ADU isn’t a cost savings. It’s a liability that surfaces when you sell the property, when your homeowner’s insurance carrier inspects it, or when a code enforcement officer drives by. Pay the permit. If a contractor tells you otherwise, they either don’t understand the business or they do and don’t care.

Pricing structures you will be quoted

Central Florida ADU proposals come in three basic pricing structures, and the choice meaningfully affects your risk.

Fixed price (sometimes called lump sum or stipulated sum). The contractor commits to a total dollar figure for a defined scope. The contractor carries the cost risk: if materials go up, they eat it. The homeowner carries the scope risk: if the scope changes, change orders apply. This is the most common ADU contract structure and the one most homeowners should default to. It forces the contractor to do a real takeoff before quoting, and it gives the homeowner budget certainty. It’s a bad fit for jobs with genuinely unknowable scope (a heavy renovation of an existing garage conversion where no one knows what’s behind the drywall), which are better handled as cost-plus with a not-to-exceed cap.

Cost-plus-fee (also called time-and-materials with a fee). The contractor bills the homeowner for actual costs (subs, materials, permits) plus a markup (typically 15–25%) for overhead and profit. The homeowner carries the cost risk; the contractor carries none. This structure can produce a fair price when the contractor runs an honest shop and keeps good records. It can also produce runaway overruns when they don’t, because there’s no incentive to control cost. If you choose cost-plus, insist on weekly cost reports with line-item receipts, a not-to-exceed cap in the contract, and a sharing mechanism for savings below the cap.

Time and materials, no cap. Don’t sign this for an ADU.

The permit-expediter question

Some Central Florida homeowners hire a permit expediter in addition to (not instead of) a general contractor. An expediter is a third-party specialist who assembles and submits the permit application package, responds to reviewer comments, and tracks the application through the county’s online portal. Expediters typically charge $1,500–$4,000 per ADU and are most useful in Orange County (where first-review turnaround can run 6–10 weeks and resubmittals have historically been slow), Osceola (where the portal and process changed in late 2024 and reviewer consistency has been uneven), and the City of Orlando within its historic preservation overlays. For the smaller counties in our coverage (Lake, Polk, Sumter, Marion, Brevard), an expediter is rarely worth the cost. A good GC handles the permitting as part of their scope.

If you’re considering an expediter, treat their license and references the same way you would a contractor’s. Expediters aren’t separately licensed in Florida, so the vetting burden is entirely on you. Ask for three recent projects in your specific county, and call the homeowners.

Florida contract and lien-law specifics you should understand before signing

Florida construction lien law (Chapter 713, Part I, Fla. Stat.) gives contractors, subcontractors, and suppliers the right to place a lien on your property if they aren’t paid. This is true whether or not you have a contract with them directly: a drywall sub who works for your GC and doesn’t get paid by the GC can still lien your property, even though your check to the GC already cleared. The lien waiver is what protects you from this.

Notice to Owner. Any subcontractor, supplier, or sub-sub who expects to lien your property if unpaid must serve you a written Notice to Owner within 45 days of first work or first delivery. If you receive one (and you will, on any ADU build; that’s normal, not a threat), file it and track it. It tells you who has lien rights on your property.

Contractor’s Final Affidavit. Before making final payment to your general contractor, you’re legally entitled to demand a Contractor’s Final Affidavit under § 713.06(3)(d), Fla. Stat., in which the contractor swears that all subs and suppliers have been paid. Demand it. Read it. Don’t release final payment without it.

Partial lien waivers at each draw. Every draw payment should be conditional on the GC delivering signed partial lien waivers from every sub who worked in the draw period. This is standard and non-negotiable. If your GC pushes back on the mechanic, they’re either inexperienced or planning to leave you exposed.

Final lien waivers at CO. At the final draw, every sub and supplier signs a final unconditional lien waiver. Without these, your “finished” ADU is a mortgage-ready asset with an unresolvable cloud on title.

Florida Homeowners’ Construction Recovery Fund. If you’re defrauded by a Certified licensed contractor and can’t recover through insurance or court, the fund can reimburse you. For contracts signed on or after July 1, 2024, the caps are $100,000 per claim and $2 million in aggregate per licensee for general, building, and residential contractors — the categories relevant to an ADU build. The fund only covers certified (not registered) license holders, which is one more reason to insist on a certified license.

Central Florida county-specific builder considerations

A builder who does excellent work in Lake County may hit surprise problems in Orange, and vice versa.

Orange County. Permitting is slower than neighboring counties and impact fees are materially higher. A builder who hasn’t closed at least three Orange County ADU COs in the last 18 months is going to eat float on the schedule you negotiate. Ask how many Orange permits they currently have open and what their last three turnaround times looked like.

Osceola County. Process and portal changes in late 2024 created a reviewer-consistency issue through 2025 that’s mostly, not fully, resolved. Builders who had to learn the new process in real time are now seasoned; builders who avoided Osceola during the transition are playing catch-up.

Lake, Polk, Brevard. These counties are generally faster and cheaper to build in than Orange, but they have smaller planning-department staffs. When a reviewer is out for vacation or jury duty, the entire queue slows down. Builders with relationships in the department are worth more here than in Orange.

Seminole. Narrower buildable envelopes on many infill lots. If your proposal doesn’t include a survey-based site plan showing the ADU against actual setback lines, you don’t yet have a deliverable.

Volusia. Coastal areas require wind-load and flood-zone engineering that inland builders sometimes underestimate. A Deltona builder who hasn’t built east of I-95 isn’t necessarily the right pick for a Port Orange or Ormond Beach lot.

Marion. R-1 versus A-1 zoning changes the rules substantially, and septic and well on A-1 parcels add scope most quotes miss. Ask specifically about the septic and well plan.

Sumter. The family-only accessory-cottage rule means many “ADU builders” who operate statewide aren’t a fit for Sumter at all: they’ll either decline the job or quote a standard ADU that doesn’t comply with the county restriction.

How we maintain this reference

We don’t publish a named directory of builders today. We can’t maintain one at the quality level we promise. An ADU-specialist shop can be excellent in Q1 and underwater in Q3, and a list that doesn’t capture that volatility becomes a liability instead of a resource. We considered a paid-placement model and rejected it. The conflict’s too direct.

When we revisit the directory question, the criteria for inclusion will be: active certified license (CGC, CBC, or CRC) with no open disciplinary action in the last 36 months; verifiable workers’ compensation coverage; three references from completed ADU projects in the last 24 months in counties we cover; a business address that’s a real location with a real presence; willingness to provide the proposal components listed above; and a contract that doesn’t require out-of-state arbitration or waivers of Florida Homeowners’ Construction Recovery Fund rights. If you’re a Central Florida builder who meets these and wants to be considered when we next open the directory, the contact form on our about page is the place to reach us.

What to actually do with this page

Before you sign a contract with anyone, run the vetting method at MyFloridaLicense.com and the Florida Division of Workers’ Compensation Proof of Coverage portal. It takes five minutes. We’ve got a step-by-step at how to verify a Florida contractor’s license.

Before you accept a bid, demand the proposal components listed above. A contractor who can’t or won’t produce them isn’t ready to take your money. We’ve got a walkthrough on requesting and comparing bids at how to get three competitive ADU bids.

And when the bids come in, remember that the cheapest one in a batch of three is almost always cheap for a reason: a missing allowance line, a missing impact-fee line, or a contractor who hasn’t yet figured out what the job actually costs. The right bid isn’t the cheapest. It’s the least expensive one you actually trust to finish.

Primary sources

• Florida Department of Business and Professional Regulation, Construction Industry Licensing Board. License search at MyFloridaLicense.com.
• Florida Statutes Chapter 489 (Contracting). Licensing requirements, owner-builder exemption (§ 489.103(7)), Florida Homeowners’ Construction Recovery Fund (§§ 489.140–.143, caps at § 489.143). Chapter 489.
• Florida Statutes Chapter 713, Part I (Construction Lien Law). Chapter 713.
• Florida Statutes § 440.10 (Liability for compensation). Statutory-employer exposure. § 440.10.
• Florida Division of Workers’ Compensation. Proof of Coverage search.
• Florida Statutes § 95.11(3)(b). Construction-defect statute of repose (7 years). § 95.11.

Last reviewed: July 4, 2026. This page is informational, not legal advice. Before signing any construction contract, consult an attorney licensed in Florida.