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Home Additions & ADUs: when you need it, cost factors, and quotes

Additions involve design, zoning and setbacks, structural work, permits, and tying new space into the old house. Whether you have plans yet, and what you want to add, matter most for an early quote.

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When you might need home additions & adus

  • Adding a bedroom, primary suite, or family room
  • A second story
  • Converting a garage
  • A backyard cottage or ADU
  • Expanding a kitchen footprint

What drives the price

  • Square footage and foundation type
  • Zoning, setbacks, and HOA approval
  • Design and engineering
  • Tying into the existing roof and systems
  • Utility connections for ADUs
  • Floodplain rules in mapped flood zones

We don't publish a dollar range for home additions & adus yet. We will once we have enough real quotes to report one honestly, with the method and date. How we calculate costs

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Questions to ask before you hire

  • Do you handle design and engineering, or do I need an architect?
  • Who checks zoning and setbacks?
  • How do you price unknowns before plans are done?
  • What's the payment schedule?

Frequently asked questions

Are ADUs allowed where I live?

It depends on local zoning. Check with your city or county planning department; a contractor or designer can help.

Do I need an architect?

For many additions, plans from an architect or designer and sometimes an engineer are needed for permits. Design-build firms handle both.

Area guides

Housing stock, foundations, permit offices, and state contractor licensing change what a remodel involves. Read the local guide for your area:

Don't see your city? Requests are accepted nationwide.

Other services

Published by Remodel.co · Last reviewed · Compiled from public sources listed on this page. Editorial policy

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