ADU Builder in Seminole County, FL
An accessory dwelling unit is a second, smaller home on a lot that already has a house on it. Brightview builds them from $75,000 on pre-priced plans, and runs the zoning feasibility free. Whether your Seminole County parcel allows one comes down to zoning, lot size, setbacks and utilities — reviewed by Seminole County Building Division or your city.
An accessory dwelling unit is a second, smaller home on a lot that already has a house on it. Brightview builds them from $75,000 on pre-priced plans, and runs the zoning feasibility free. Whether your Seminole County parcel allows one comes down to zoning, lot size, setbacks and utilities — reviewed by Seminole County Building Division or your city.
Building in Seminole County: what's actually different here
Seminole County is the tightest, most established of our eight markets — it was built out early, which is exactly why scattered infill lots keep turning up inside neighborhoods that already have A-rated schools, mature trees and finished streets. The county is compact enough that a single superintendent can cover Sanford, Lake Mary, Oviedo and Longwood in one morning, and its impact-fee load is among the lowest in Central Florida.
Seminole sits inland, so wind design is the Central Florida baseline rather than the coastal upgrade, and the flood exposure that matters here is the St. Johns River basin on the north and east edges.
What Seminole County means for your budget and your schedule
- One of Florida's highest-rated public school districts, which holds resale value on every street we build.
- Impact and tap fees run near the bottom of our eight-county footprint — about $4,000 on our smallest plan.
- SunRail runs Sanford → Lake Mary → Longwood → Altamonte, so infill lots near a station carry a real commute advantage.
- Mostly sewer-served inside the cities, with septic still common on larger unincorporated parcels — it changes the site budget, so we confirm it before you sign.
- Inland location: no wind-borne-debris zone, which keeps window and strapping costs lower than the coastal counties.
The three structures we build in Seminole County
Pre-priced, engineered and permitted — not a cost-plus job with an open end. Site conditions (utility runs, access, impact fees) get quoted on top, in writing, before you sign.
The Garage
21' × 23' detached two-car garage. Pre-wired and pre-plumbed so it can convert to a dwelling later.
The 1-Bedroom ADU
498 sq ft, 21' × 23'. A true 1BR/1BA with its own entry, kitchen and laundry.
The Carriage ADU
Two stories: parking and storage below, a 517 sq ft one-bedroom apartment above.
Why owners in Seminole County build with us
- A 1-bedroom ADU from $75,000 — pre-priced plans, not an open-ended cost-plus job.
- Rental income, an aging parent, an adult kid, or a home office that is genuinely separate.
- Free zoning and feasibility report on your specific parcel before you spend a dollar.
- Every jurisdiction treats accessory dwellings differently — we find out what yours allows, in writing.
- Built by a licensed general contractor to the same code and the same warranty as our houses.
How a Seminole County build runs, start to finish
Send your address
One address is enough to start the zoning check.
Free feasibility report
Whether your parcel allows an accessory dwelling, at what size, with what setbacks, parking and utility connections.
Pick a plan
Three pre-priced plans: the garage, the 1-bedroom ADU, and the carriage unit with parking below.
Permits
We handle the accessory-dwelling permit through your city or county, including impact and tap fees.
Build
Typically 4–6 months from permit to certificate of occupancy on a standard lot.
ADUs by city in Seminole County
Brightview builds throughout Seminole County, including Sanford, Lake Mary, Oviedo and Longwood. Pick your city for local permitting, lot and pricing detail:
Everything else we build in Seminole County
Straight answers
Can I build an ADU in Seminole County?+
It depends on your specific parcel — zoning, lot size, setbacks, parking and utilities all decide it, and in Seminole County that review goes through Seminole County Building Division. Brightview runs that feasibility check free: send an address, get a written answer. Brightview Homes is a licensed Florida general contractor (CRC1334100) building across eight Central Florida counties. Call (407) 543-1739.
How much does an ADU cost in Seminole County?+
Brightview's pre-priced accessory dwellings start at $75,000 for a 498 sq ft one-bedroom unit and $98,000 for the two-story carriage unit with parking below. Site conditions — utility runs, impact fees, access — are quoted on top in writing before you sign.
What is an ADU, exactly?+
An accessory dwelling unit is a second, smaller, complete home on a lot that already has a primary house — its own kitchen, bathroom and entrance. People call them granny flats, in-law suites, casitas, garage apartments and backyard cottages; the code calls them accessory dwellings.
How long does it take to build an ADU in Seminole County?+
Typically 4–6 months from issued permit to certificate of occupancy on a standard Seminole County lot, with permitting through Seminole County Building Division ahead of that. Utility connections and impact fees are the usual schedule variable, not the construction itself.
Will an ADU in Seminole County pay for itself?+
That depends on your rent comps and what you finance it with, and we won't pretend otherwise. What we will do is show you the actual all-in cost for your parcel so you can run the math against real Seminole County rents instead of a brochure number.
Do I need my own architect for an ADU in Seminole County?+
No. Our three plans are already drawn and engineered, which is what keeps them pre-priced. If your parcel needs something custom — an odd setback, a historic overlay, a tight envelope — we'll tell you before you pay for design.
Talk to a builder, not a call center
Send us an address or a question. We answer with real numbers — what it costs, what your parcel allows, and how long it takes.