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 [12][13]
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) | $140,000-$350,000 |
| Cost per Sq Ft | $250-$400 |
| Garage Conversion | $30,000-$100,000 |
| Prefab / Modular ADU (installed) | $150,000-$300,000 |
| City Permit & Plan Review | Building permit $150 for the first 300 sq ft plus $0.50 per added sq ft ($400 for 800 sq ft), plus a $300 application fee and $50-per-trade electrical, mechanical and plumbing permits, per the FY26 Comprehensive Fee Ordinance 2025-09-48 (effective Oct 1, 2025); FY27 figures apply from Oct 1, 2026. |
| Impact Fees | Frisco's impact fees are assessed per water meter and per new dwelling unit under Ordinance 19-04-29: water $2,120 and wastewater $2,344 for a 1-inch single-family meter (Exhibits B and C), and a roadway fee of $1,935-$4,257 per single-family dwelling unit depending on service area. Whether a garage apartment served by the existing meter is assessed is not stated in the schedule — confirm with Development Services (972-292-5301) before pricing the project |
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 floor-area cap: §4.06.03 sets location, permit, rental and setback standards for a Garage Apartment or Guest House but no maximum size. What binds 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 (§2.06.04). A detached unit is a Guest House, defined in §7.01.01 only as "an accessory building used to house guests of the owner(s)" — confirm with Development Services before adding 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" (§4.06.03(C)(2)). The unit 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). No affidavit or deed restriction is required by the text).
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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 (Building permit $150 for the first 300 sq ft plus $0.50 per added sq ft ($400 for 800 sq ft), plus a $300 application fee and $50-per-trade electrical, mechanical and plumbing permits, per the FY26 Comprehensive Fee Ordinance 2025-09-48 (effective Oct 1, 2025); FY27 figures apply from Oct 1, 2026.), plan check (Standard residential plan review through the electronic permit portal; plan revisions are billed at $50 per hour (Ordinance 2025-09-48). Budget for the facade rule: the exterior of an accessory structure must use the same exterior material as the main building and meet or exceed §4.07.09 Exterior Construction of Main Buildings (100% masonry), with fiber cement siding allowed only on a structure of 200 sq ft or less in a single-family or two-family district, or where the main house is itself all wood or vinyl siding (§4.06.05)), and impact fees (Frisco's impact fees are assessed per water meter and per new dwelling unit under Ordinance 19-04-29: water $2,120 and wastewater $2,344 for a 1-inch single-family meter (Exhibits B and C), and a roadway fee of $1,935-$4,257 per single-family dwelling unit depending on service area. Whether a garage apartment served by the existing meter is assessed is not stated in the schedule — confirm with Development Services (972-292-5301) before pricing the project) 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" (§4.06.03(B)); no rezoning, specific use permit, variance or hearing. Apply through Frisco's electronic permit portal (Plans & Permits, 972-292-5301): create an account, file the residential application, pay the fees assigned by email, pass pre-screen, then Department Review; the permit downloads on approval", typically Not published. Frisco's Residential Permits page lists the steps (electronic application, fees assigned by email, pre-screen, Department Review, permit download) but no review-time target — confirm current turnaround with Plans & Permits (972-292-5301).) 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 (Not published. Frisco's Residential Permits page lists the steps (electronic application, fees assigned by email, pre-screen, Department Review, permit download) but no review-time target — confirm current turnaround with Plans & Permits (972-292-5301).) 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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