An ADU builder in Frisco is a licensed contractor who designs and constructs accessory dwelling units — detached backyard units, garage conversions, attached additions, and junior ADUs (JADUs). Because an ADU is a complete second dwelling, the builder coordinates foundation, framing, plumbing, electrical, and HVAC work and pulls it through Frisco's permit process and utility connections. Not every general contractor has built one, so the right builder is one with ADU-specific experience in Texas.
What ADU Builders Cost in Frisco [8]
Based on our Frisco cost data, expect the following ranges from local ADU builders. Quotes for the same scope typically vary 20-40% between contractors, so getting at least three bids is the single best way to control cost.
| New Detached ADU (all-in) | $135,000-$270,000 |
| Cost per Sq Ft | $155-$285 |
| Garage Conversion | $65,000-$150,000 |
| Prefab / Modular ADU (installed) | $95,000-$205,000 |
| City Permit & Plan Review | Frisco publishes a Permit Fee Schedule on its Residential Permits page, but the document is served behind a bot check and could not be read — Confirm current building permit and plan review amounts with Frisco Plans & Permits (972-292-5301) |
| Impact Fees | Confirm with Frisco Development Services (972-292-5301) — no ADU-specific impact fee schedule was found in a city source |
For a full line-item breakdown, see our Frisco ADU cost guide. To confirm what you're allowed to build before you hire, review the Frisco ADU rules (max detached size: No ADU-specific floor-area cap appears anywhere in Frisco's zoning ordinance — §4.06.03 sets location, permit, rental and setback standards for a Garage Apartment or Guest House but states no maximum size. What binds instead is the district's maximum lot coverage for all buildings: 45% in SF-7, SF-8.5 and SF-10, 40% in SF-12.5, 30% in SF-16, 20% in RE and 55% in OTR (Frisco Zoning Ordinance §2.06.04). Note also that a detached unit in Frisco is a Guest House, which §7.01.01 does not define as a dwelling unit — confirm with Frisco Development Services (972-292-5301) before designing a detached unit with a kitchen; owner-occupancy: Required in order to rent. "A Garage Apartment or Guest House may be rented or offered for rent provided that the main dwelling unit is owner-occupied" (Frisco Zoning Ordinance §4.06.03(C)(2)). The unit also may not be sold separately from the entire property including the main dwelling (§4.06.03(C)(1)), and owner-occupancy is written into the definition of Garage Apartment itself (§7.01.01)).
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How to Vet an ADU Builder in Frisco
- License: Confirm a current contractor's license in Texas and that it's in good standing. Ask for the license number and verify it with the state board.
- ADU-specific experience: Ask how many ADUs they've completed in or near Frisco and request addresses or photos. ADU permitting and setbacks differ from a kitchen remodel.
- Portfolio & references: Get references from recent ADU clients and, if possible, visit a finished unit.
- Insurance: Verify general liability and workers' compensation coverage. Ask for a certificate of insurance.
- Written, detailed bid: Insist on an itemized, fixed-price or clearly-scoped bid — not a verbal estimate. It should state whether permits (Frisco publishes a Permit Fee Schedule on its Residential Permits page, but the document is served behind a bot check and could not be read — Confirm current building permit and plan review amounts with Frisco Plans & Permits (972-292-5301)), plan check (Standard residential plan review through Frisco's electronic permit portal. Budget for the facade rule: the exterior of an accessory structure must be built of the same exterior material as the main building and must meet or exceed §4.07.09 Exterior Construction of Main Buildings, with fiber cement siding allowed to satisfy the masonry requirement only on a structure of 200 sq ft or less in a single-family or two-family district (Frisco Zoning Ordinance §4.06.05). Confirm review timing with Frisco Plans & Permits (972-292-5301)), and impact fees (Confirm with Frisco Development Services (972-292-5301) — no ADU-specific impact fee schedule was found in a city source) are included.
- Permit handling: Confirm they manage Frisco's permit process ("By-right building permit — "A Garage Apartment or Guest House may be constructed only with the issuance of a Building Permit" (Frisco Zoning Ordinance §4.06.03(B)). §4.06.03 requires no rezoning, specific use permit, variance or public hearing. Applications are filed through Frisco's electronic review portal under Residential Additions & Alterations", typically Confirm with Frisco Plans & Permits (972-292-5301) — no published review timeline for a Garage Apartment or Guest House was found in a city source) and who is responsible if revisions are required.
- Payment schedule: Avoid large upfront payments. A reasonable schedule ties payments to completed milestones.
Questions to Ask Before You Hire
- How many ADUs have you built in Frisco in the last two years?
- Is your bid fixed-price, and what would trigger a change order?
- Are permits, plan check, and utility connection fees included?
- What's a realistic timeline, including permit review (Confirm with Frisco Plans & Permits (972-292-5301) — no published review timeline for a Garage Apartment or Guest House was found in a city source) and construction?
- Who is my point of contact and how are delays communicated?
- What warranty do you provide on workmanship?
- Can you share three recent Texas ADU client references?
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