General construction: budget, finance, project types
ADU and granny flat planning guide
An accessory dwelling unit, also called a granny flat or secondary suite, is a small separate home on the same lot as a main house. Rules vary a great deal by place, so the first step is always the local authority.
An accessory dwelling unit, also called a granny flat or secondary suite, is a small separate home on the same lot as a main house. Rules vary a great deal by place, so the first step is always the local authority.
Start with the rules
Contact the local planning or building department and ask in writing about permitted ADU types, maximum size, setbacks, height, parking, owner occupancy and utility requirements. Also ask about impact fees and review times. Rules change, so note the date of each answer.
Choose a type
Common types are a detached unit, a conversion of a garage or basement, and an addition to the main house. Each has different structure, utility and access consequences. Match the type to your site and your reason for building.
Plan the interfaces
- Water, sewer and electrical connections, and whether the existing service can carry the load.
- Access for construction equipment and deliveries.
- Privacy, drainage and fire access.
- Whether a factory-built or panelized approach suits the site. See prefab vs site-built.
Budget with your own numbers
Use the budget guide and add the lines people forget: connection fees, site access and permit costs. Funding options vary, so see the CFPB for general consumer guidance and speak with a lender.
Quick answers
- Can I build an ADU on my lot? It depends on local zoning and building rules. Ask the planning department for the current requirements on size, setbacks, parking and use.
- What usually drives ADU cost? Utility connections, site work, the foundation and the finish level, along with permit fees. Get your own quotes.
- Can I rent it out? Local rules differ on rental use and occupancy. Check before you rely on rental income in your plan.
This guide is general information. Confirm structural, legal, financial and permitting questions with qualified professionals and the local authority, and use written quotes for any commitment.
Questions people ask
Can I build an ADU on my lot?
It depends on local zoning and building rules. Ask the planning department for the current requirements on size, setbacks, parking and use.
What usually drives ADU cost?
Utility connections, site work, the foundation and the finish level, along with permit fees. Get your own quotes.
Can I rent it out?
Local rules differ on rental use and occupancy. Check before you rely on rental income in your plan.
Sources and further reading
Have a project outline or drawings?
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