Central Florida ADU Builders: How to Choose the Right One

The hardest part of building an accessory dwelling unit in Central Florida is not permitting and it is not financing. It is 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 whether you got it right, and the honest answer is that most homeowners pick wrong on their first try and find out eighteen weeks later.

This page is the reference we would have wanted before hiring. It covers who actually builds ADUs in Central Florida, what license a contractor is legally required to hold to do the work on your property, what a real ADU proposal contains, the pricing structures you will see quoted, the red flags that should end a conversation, and the Florida-specific contract language you should refuse to sign without. There are no vendor rankings here. The builder market in Central Florida shifts too quickly for a static list to be useful — a shop that was excellent in 2024 can lose its lead superintendent in 2025 and be a mess by 2026. What does not change is the method for evaluating them. That method is what this page teaches.

The five types of builders who will quote your ADU

The Central Florida ADU market does not 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 are 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 who have added ADUs to their offering because enough existing clients have asked. Their price per square foot is typically the highest of any category because their overhead was set up for larger jobs, but their finish quality and project management discipline are usually the best. They are worth the premium if you want a 900 sq ft ADU that looks and feels like the primary home and you are in no hurry on the budget. They are a poor fit if you are building a bare-bones rental ADU on a tight budget.

ADU-specialist shops. A small number of Central Florida firms have built their entire business around ADUs — usually started in 2023–2024 after homeowners started asking for them in higher volumes. These specialists typically offer a defined product line (three or four floor plans at fixed prices), have worked through the permitting quirks of every major county, and can move fast because they are not juggling a 4,800 sq ft custom home on the same calendar. Their price per square foot is usually the lowest of any traditional build category. The trade-off is that you are often choosing from their menu rather than 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 of them 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. A meaningful share of ADUs in Central Florida are built by generalist GCs who are on their second or third ADU rather than their fiftieth. They are a reasonable fit if you are comfortable managing more of the process yourself — selecting finishes, sourcing appliances, chasing down the surveyor, walking the inspector through when the GC cannot be there — and if you have a good set of drawings from an architect you hired separately. Prices vary wildly in this category, as does quality. The vet-the-generalist checklist later in this page was written primarily for this segment.

Modular and factory-built assemblers. A growing fraction of Central Florida ADUs are modular units manufactured off-site (often in Georgia, Alabama, or south Georgia) and set on a site-built foundation. The assembler you contract with is not the manufacturer — they are the local licensed contractor who handles site prep, foundation, utility connections, set day, and final inspections. Schedule certainty is generally better with modular (weather delays affect only the site-built portion), and per-square-foot pricing is often lower for comparable finish levels. The trade-off is design inflexibility: you pick from the manufacturer’s model line. If your lot has access constraints — narrow side yards, overhead wires, tight swing room for the crane — modular may not be viable at all. Confirm crane access during site walk, not after deposit.

Owner-builder with a subcontractor stack. Florida law allows a homeowner to 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 for each trade. This can save 15–25% of total project cost in exchange for taking on the coordination work, the schedule risk, and the liability. It is a legitimate path for a homeowner with construction experience or the time to develop it. It is a bad path for anyone who has not read Chapter 713, Fla. Stat. (construction liens) end to end and does not have a plan for lien waivers, Notice to Owner responses, and pay applications. The owner-builder exemption is not a shortcut around the rules; it is 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 are a handful of license types and two tiers of each.

Certified vs Registered. A certified license is valid statewide. A registered license is valid only in the local jurisdiction (county or municipality) that accepted the contractor’s competency exam and is recognized only in that jurisdiction and in others with reciprocal agreements. For an ADU, you want a certified license holder unless you have confirmed that the registered license is valid in the specific county where your property sits. If you live in a border area — a property in east Osceola near Brevard, for example — a registered license in one county does not automatically carry over to the next. Certified is 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 will see most often.
• Registered Residential Contractor (RR). Same scope as CRC but local-only.

Licenses you may see and should recognize as not qualifying the holder to build your ADU: roofing (CCC), plumbing (CFC), electrical (EC), air conditioning (CAC), pool/spa (CPC), specialty (various). A roofer is not licensed to build your ADU, even if they are also framing your roof on it. The general or residential contractor is the party 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 signing a contract with anyone, you should 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 individual you have been negotiating with, or is an officer of the company you are contracting with. A common scam pattern 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 does not match, walk. There is a full tactical 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. Each county and most cities in Central Florida require a local business tax receipt (previously called an occupational license) before a contractor can pull permits in that jurisdiction, and every county building department will require the contractor to show general liability insurance and either workers’ compensation coverage or a valid FL-WCE exemption certificate for each person on the job site. If your builder cannot produce these documents on request, they are either not legitimate or not ready to work in that county.

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

A licensed Florida contractor is required to carry general liability insurance at minimums set by their license class and the jurisdiction where they work. Typical general liability floors for residential work are $300,000 per occurrence / $300,000 aggregate, though many legitimate contractors carry $1M/$2M policies. Ask to be named as an additional insured on the policy for the duration of the ADU project — legitimate builders will do this without comment. If you hear any pushback, treat it as a red flag.

Workers’ compensation is where homeowners get into real trouble in Florida. Under § 440.10, Fla. Stat., if a worker is injured on your property and the contractor they work for does not have workers’ compensation coverage, you as the property owner can be held liable for the injury as a statutory employer. This is not theoretical — it is how several homeowners discover that they are on the hook for a six-figure workers’ comp claim after a fall off a roof. The fix is simple: every contractor on the job, and every subcontractor they bring, must either carry workers’ compensation coverage (verify at the Florida Division of Workers’ Compensation Proof of Coverage search) or hold a valid exemption certificate as a corporate officer of their own company (verify at the same portal). Keep copies of the certificates in your file before any trade 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 are one-page PDFs with a scope summary and a total dollar amount and nothing underneath the total. That is not a proposal. A real ADU proposal from a competent builder in Central Florida 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 see that the HVAC line is, say, $7,800 and decide 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 has not yet chosen exact models. The allowance is a budget. If you spend more than the allowance at the showroom, you pay the difference. If you spend less, you get the difference back. A real proposal shows the allowance for each category so you can tell whether the contractor has priced cheap builder-grade or mid-tier finishes.

A draw schedule tied to verifiable milestones. Payment is not a percentage of time passed. It is 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 does not say, assume the contractor will bill you whatever they feel is reasonable.

Warranty terms. Florida has a ten-year statutory warranty on latent defects under § 95.11(3)(c), Fla. Stat., but most contractors offer a shorter express warranty — typically one year workmanship, two years systems, ten years structural. Know what you are getting before you sign.

License number, insurance certificates, and workers’ comp proof attached or referenced. If these are not in the proposal packet, ask before negotiating price.

If a proposal is missing more than one of these elements, the issue is not that the contractor forgot to include something. The issue is that this is how they will 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 cause you to 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 does not match the contracting entity at MyFloridaLicense. A qualifier listed on the license who is not 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 across any platform. Reviews that all appear 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 Construction Industries Recovery Fund. A contract that requires arbitration in a venue outside Florida. No signed lien waiver at each draw. A refusal to let you contact past clients directly. Subcontractors who are not named, or who change mid-project without notice. A proposal in which the contract sum is lower than the sum of the itemized trade lines (yes, this happens — it is a math error the contractor hopes you will not catch, and it usually catches up in change orders).

One specific pattern worth naming: 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 is not a cost savings — it is a liability that will surface 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 suggests otherwise, they do not understand the business or they understand it and do not 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 is a bad fit for jobs with genuinely unknowable scope (a heavy renovation of an existing garage conversion where no one knows what is 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 no cost risk. This structure can produce a fair price when the contractor runs an honest shop and keeps good records. It can produce runaway overruns when the contractor does not, because there is 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. Do not 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 are considering an expediter, treat their license and references the same way you would a contractor’s. Expediters are not 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, Fla. Stat.) gives contractors and subcontractors and suppliers the right to place a lien on your property if they are not paid. This is true whether or not you have a contract with them directly — a drywall sub who works for your GC and does not get paid by the GC can lien your property, even though your check to the GC cleared. The protection against this is the lien waiver.

A few things to know:

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 a Notice to Owner — and you will, on any ADU build; it is 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 are 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. Do not 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 are 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.

Construction Industries Recovery Fund. If you are defrauded by a Certified licensed contractor and cannot recover through insurance or court, the Florida Construction Industries Recovery Fund can reimburse you up to $50,000 per claim and $500,000 in aggregate for that contractor. The fund only covers certified (not registered) license holders. This is another 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. A few county-specific patterns worth knowing:

Orange County. Permitting is slower than neighboring counties and impact fees are materially higher. A builder who has not 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 has 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 who have relationships with the department are more valuable in these counties than in Orange.

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

Volusia. Coastal areas require wind-load and flood-zone engineering that inland builders sometimes underestimate. A Deltona builder who has not built east of I-95 is not 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 are not a fit for Sumter at all — they will either decline the job or quote a standard ADU that does not comply with the county restriction.

How we maintain this reference

We do not publish a named directory of builders today. The reason is that we cannot maintain it at the quality level we promise. An ADU-specialist shop can be excellent in Q1 and underwater in Q3, and a list without that volatility captured becomes a liability rather than a resource. We have considered a paid-placement model and rejected it — the conflict is 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 is a real location with a real presence; willingness to provide the proposal components we listed above; and a contract that does not require out-of-state arbitration or waivers of Construction Industries Recovery Fund rights. If you are 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

Three things.

First, 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. Five minutes. We have a step-by-step at how to verify a Florida contractor’s license.

Second, before you accept a bid, demand the proposal components listed above. A contractor who cannot or will not produce them is not ready to take your money. We have a walkthrough of how to request and compare bids at how to get three competitive ADU bids.

Third, recognize that the cheapest bid in a batch of three is almost always cheapest for a reason — usually a missing allowance line, a missing impact-fee line, or a contractor who has not yet discovered what the job actually costs. The least expensive bid that you trust to finish is the right bid.

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)), Construction Industries Recovery Fund (§§ 489.140–.143). Chapter 489.
• Florida Statutes Chapter 713 (Liens and claims). 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)(c). Latent-defect statute of repose. § 95.11.

Last reviewed: April 17, 2026. This page is informational, not legal advice. Before signing any construction contract, consult an attorney licensed in Florida.