ADU construction

Westminster ADU
Construction Quotes

Looking for the top ADU construction experts Westminster has to offer? When it comes to info about Westminster Guest House Construction and Westminster ADU Quotes, we're here to help.
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 ADU Construction in Westminster, California

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Westminster ADU Quotes for Your Backyard Project

ADU Westminster is here to help you with:
  • ADU Construction
  • Backyard Office Construction
  • ADU Planning and Construction
  • Guest House Construction
  • Financing Your ADU in Westminster
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for your ADU project! 
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Affordable ADU Solutions in Westminster

3 Steps to Westminster ADU Construction

Determine Eligibility

Start by checking your property's zoning through Westminster's online map. ADUs are allowed in residential zones. You'll need to verify if your property is in a flood zone and check your title report for any easements that could affect construction.

Professional Planning

Hire a qualified professional - either a licensed architect, engineer, or contractor - to create your architectural plans. They'll develop site plans, floor plans, elevations, and roof plans that comply with all city requirements and building codes.

City Review and Construction

The builder will submit your plans for city pre-screening by the Planning, Engineering, and Building Divisions. Once approved, you'll get permits and begin construction.
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Accurate ADU Quotes Based on Square Feet

Westminster ADUs have specific size limitations. Junior ADUs must be 500 square feet or less. For attached ADUs, the maximum is either 1,200 square feet or 50% of the primary dwelling's living area, whichever is greater. Detached ADUs are limited to 1,200 square feet. All sizes must comply with lot coverage requirements for their zone.
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ADU Construction Setback Requirements in Westminster

For detached and attached ADUs, Westminster requires minimum setbacks of 4 feet from side and rear property lines. Front setbacks must be at least 50 feet from the street centerline or 20 feet from the ultimate right-of-way line, whichever is less. Converted ADUs within existing structures are exempt from setback requirements.
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Other Westminster ADU Requirements

ADUs must match the primary dwelling's exterior design, including roof material, design, pitch, and color. Solar panels are required for newly constructed detached ADUs. All ADUs need separate entrances from the main home and require one parking space for units with one or more bedrooms. Short-term rentals under 31 days are not permitted.

Westminster ADU Zoning Map

Westminster ADU FAQs

How many ADUs can I build on my property? 
If you have a single-family home, you can build one Junior ADU and one regular ADU. For multi-family properties, you can either convert existing space into ADUs up to 25% of the number of existing units, or add two detached ADUs.
What are the size limitations for ADUs?
In Westminster, Junior ADUs must stay under 500 square feet. If you're converting existing space into an ADU, there's no maximum size limit. For attached ADUs, you can build up to 1,200 square feet or half the size of your main house, whichever gives you more space. Detached ADUs can be up to 1,200 square feet.
Do I need a permit to build an ADU? 
You definitely need permits for an ADU in Westminster. The process involves getting your plans pre-screened by the city, going through plan check review, getting zoning clearance, and obtaining building permits. You'll also need inspections throughout construction. The whole permit process typically takes about 60 days from when you submit a complete application.
How much does it cost to build an ADU? 
The cost to build an ADU in Westminster, can range from $350 to $550 per square foot. For a standard detached ADU of around 600 to 800 square feet, you might expect to spend between $210,000 to $440,000. Larger units or those with premium finishes could easily exceed $500,000.
Will building an ADU increase my property taxes?
Yes, building an ADU will likely increase your property taxes, but the increase is based on the value of the ADU structure only, not the land value. 
Can I rent out my ADU? 
You can rent out your ADU, but there are some important rules. All leases must be 31 days or longer - short-term vacation rentals aren't permitted. For properties with JADUs, there's an extra requirement: the property owner must live on-site, either in the main house or the JADU.
Sources: Westminster California ADU and JADU Guide: https://www.westminster-ca.gov/home/showpublisheddocument/4114/637689600217500000
Westminster City website: https://www.westminster-ca.gov/departments/community-development/planning-division/accessory-dwelling-units
https://www.westminster-ca.gov/departments/community-development/planning-division/fees
ADUNewswire ADU Friendly Requirements - https://www.adunewswire.com/p/westminster-adu-friendly-requirements
Disclaimer: The information provide is for general informational purposes only and should not be relied upon as a substitute for consulting the official Municipal Code or seeking guidance from your local Community and Economic Development Department.
(213) 401-4973
2929 Westminster Street
Westminster, CA 90740