Do you need a permit to replace an AC unit in Sanford?
Yes — and in Sanford the harder question is which office issues it. Parcels inside city limits are permitted by the City of Sanford Building Division at 300 N. Park Avenue. Unincorporated addresses sharing the 32771 and 32773 ZIPs go to the Seminole County Building Division at 1101 E. First Street, which is also in Sanford and cannot permit the city.
Your address decides your desk
DECISION PATHYour service address
Is the parcel inside the City of Sanford municipal limits?
A 32771 or 32773 mailing address does not answer this. ZIP 32771 runs well past the city line into unincorporated territory, including Midway CDP (2020 population 1,524) and Lake Monroe.
Seminole County Building Division
1101 E. First Street, Sanford, FL 32771-1468
407-665-7050
Yes — that address is in Sanford. The county’s building division sits inside the city it cannot permit. Its own page describes its role as reviewing permits and inspections for properties in unincorporated Seminole County.
City of Sanford Building Division
300 N. Park Avenue, Sanford, FL 32771
Building Department 407-688-5150 · city main line 407-688-5000
Portal: Citizenserve. Plan review is fully electronic — the city no longer accepts paper plans, and drawings need digital signatures from the design professional.
Is the parcel inside a local historic district?
Local designation, unlike a National Register listing, carries binding review of exterior work. Sanford has four local districts: Downtown Commercial (Ord. 1777, 1985), Sanford Residential (Ord. 3814, 1993), Georgetown Residential (Ord. 4730, 2023) and Sanford Avenue (Ord. 4729, 2023).
City of Sanford Development Services — Building Division and Historic Preservation; the city’s COA requirements sheet; Schedule S, Historic Preservation District, Secs. 2.0, 8.0(F) and 9.0; Seminole County Development Services — Building.
Why this catches people out
THE TRAPSearch “Seminole County building department” from a Sanford address and you get an office at 1101 E. First Street, Sanford. It is a real building division, it is in your city, and if your house is inside the city limits it cannot pull your permit. Its own page describes its role as reviewing permits and inspections for properties in unincorporated Seminole County.
The office that can is three-quarters of a mile away at 300 N. Park Avenue, on a different portal, with a different fee schedule.
Meanwhile a Sanford mailing address is not proof of anything. ZIP 32771 extends past the city line into unincorporated Seminole County, including Midway, a census designated place with a 2020 population of 1,524, and Lake Monroe. A homeowner there has a Sanford address, a Sanford ZIP, Sanford neighbours — and files with the county. This is why our copy says “inside city limits” rather than “in Sanford”.
| City building | 407-688-5150 |
| City main | 407-688-5000 |
| COA questions | 407-688-5183 |
| Historic Pres. Officer | 407-688-5140 |
| County building | 407-665-7050 |
| Inspections | 1-888-606-3726 |
City of Sanford Building Division and COA requirements sheet; Seminole County Development Services. City inspections can be scheduled online through Citizenserve, by phone, or by text to the same number.
HB 803 does not exempt your changeout
2026 STATUTEHB 803 (2026), ch. 2026-63, effective 1 July 2026, exempts a range of sub-$7,500 single-family work from permitting. It is being read online as though it exempts everything cheap. It does not: the bill expressly carves out mechanical work — verbatim, “any electrical, plumbing, structural, mechanical, or gas work” — at s. 553.79(1)(g)2.b., F.S.. An AC changeout is both mechanical and, at the disconnect, electrical work, so it is excluded by two of the five named trades and still needs a permit no matter what it cost.
Two more things are true, and worth keeping separate from each other. First, since 1 July 2026 the permitting office must approve, approve with conditions, or deny a mechanical permit on an existing single-family home within five business days of a complete application, but only when the work is valued under $15,000 and you use the local government’s own plans reviewer — s. 553.792(1)(a)1., F.S.. A full changeout priced above $15,000 falls under a longer tier of the same statute. Second, HVAC replacement is defined as a single-trade inspection, which lets an owner hire a licensed private provider instead of waiting on the building department — but that definition is not from HB 803. It already existed at s. 553.791(1)(r), F.S. before this bill passed; HB 803 only amended the surrounding section. Neither of these is a way to skip the permit itself.
Seminole County is not in the High-Velocity Hurricane Zone. Under the 2023 Florida Building Code, Residential, R202, the HVHZ is Broward and Miami-Dade counties only. If a quote for a Sanford house carries an HVHZ line item, ask what code section it is citing.
Where the condenser is allowed to sit
SCHEDULE S 9.0(10)(e)Inside the local historic districts, Sanford’s Schedule S constrains the placement of the outdoor unit, not just its approval. Sec. 9.0, item 10.e reads: “Air conditioning, mechanical equipment and other support equipment shall not be placed in a setback and must be screened from view.”
On the narrow pre-1940 lots that make up most of the Sanford Residential district, the obvious place for a condenser — tight against the side property line, out of sight from the street — is often exactly inside the side setback. Establishing that before the equipment is on a truck avoids a re-set and a code enforcement letter, and it is a real design decision: pad location, line-set routing, and what the screening is going to be.
Schedule S, Historic Preservation District, Sec. 9.0, item 10.e. Setback depth is set by the underlying zoning district and is not dimensioned in the drawing.
The Certificate of Appropriateness, in detail
MINOR REVIEWFour local districts, not just National Register listings
Sanford has four local historic districts: Downtown Commercial (Ordinance 1777, 1985), Sanford Residential (Ordinance 3814, 1993), Georgetown Residential (Ordinance 4730, 2023) and Sanford Avenue (Ordinance 4729, 2023).
Local designation is the one that bites. A National Register listing is honorific and does not, by itself, control what you do to your own house. A local district carries binding review of exterior work — and neighbouring Seminole County cities do not impose anything like it on a residential AC job.
Minor review means staff, not the board
The city’s COA requirements sheet lists “Mechanical systems including heating and cooling equipment” as a MINOR review. That is good news: staff can approve it. You are not waiting on the Historic Preservation Board, which meets the third Wednesday of each month at 5:30 p.m. at 300 N. Park Avenue with board-track applications due by the 1st.
It is filed through the same Citizenserve portal as the permit, under Services > Development & Zoning > Certificate of Appropriateness.
What the submittal wants
The relevant submittal category is “Site Improvements / Driveway / Walkway / AC / Mechanical”. It asks for a site plan, and it asks the applicant to indicate whether the AC installation will require new pads or re-use the existing one.
Which is why the pad question gets asked at the estimate rather than on installation day.
Georgetown is carved out
Schedule S Sec. 8.0(F) states that in the Georgetown Residential Historic District a certificate of appropriateness is required for demolition of a structure, in whole or part, and new construction. A like-for-like condenser changeout is neither.
So the identical job, on the identical house, needs a COA on one side of Sanford Avenue and does not on the other. That is not a loophole — it is what the ordinance says, and it is worth knowing before someone bills you for an application you never needed.
Who pulls it, and what we do not know
HONEST GAPSWe pull the permit with whichever office has jurisdiction over your parcel. Florida licenses air-conditioning contractors under Chapter 489, Part I, F.S., through the Construction Industry Licensing Board at DBPR, and s. 489.105(3) defines the classes by scope: a Class A contractor is unlimited; a Class B contractor is limited to 25 tons of cooling and 500,000 Btu of heating in any one system; Class C is a service-only class that applies to people who held one as of 1 October 1988. A residential changeout sits comfortably inside Class B limits.
You can check any contractor yourself at the DBPR licensee search. Section 489.119(5)(b), F.S. requires the certification number to appear “in each offer of services, business proposal, bid, contract, or advertisement, regardless of medium” — which means it belongs on the website, not just on the contract.
Permit questions, verbatim
VERBATIM QUERIESDo I need a permit to replace my AC unit in Florida?
Yes. Seminole County's building division lists "Replacement of a condenser, air handler or both, and/or package unit" as work that requires a permit, and HB 803 (2026), effective 1 July 2026, expressly carves mechanical work out of its new sub-$7,500 exemption for single-family work. In Sanford the only real question is which office issues it: the City of Sanford Building Division at 300 N. Park Avenue for parcels inside city limits, or the Seminole County Building Division at 1101 E. First Street for unincorporated addresses that share the 32771 and 32773 ZIPs.
Are permits needed to replace AC in Florida?
Yes, and a Sanford homeowner has a second question after that one. If the property is in the Sanford Residential, Sanford Avenue or Downtown Commercial local historic district, a Certificate of Appropriateness is required in addition to the mechanical permit. The city's COA requirements sheet classifies mechanical systems including heating and cooling equipment as a MINOR review, which staff can approve without the Historic Preservation Board meeting. In the Georgetown Residential Historic District, Schedule S Sec. 8.0(F) requires a COA only for demolition and new construction, so a like-for-like changeout there does not need one.