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Accessory Dwelling Units · North County San Diego

An ADU is one of the most powerful moves a California homeowner can make — a second home for family, a long-term rental, or a genuine boost to resale value. But the rules, the numbers, and the paperwork are where most projects stall. Big House Real Estate walks you through every stage, from the first feasibility question to the day your unit is ready to live in.

 

What an ADU can do for you

Accessory Dwelling Units — granny flats, casitas, garage conversions, backyard cottages — have become a cornerstone of housing in San Diego County. State law has steadily cleared the way, and for many homeowners an ADU pencils out better than a move-up purchase. The question is rarely whether; it is how, and how much.

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Rental income

A well-placed unit can offset a meaningful share of your mortgage, or become a standalone income property on land you already own.

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Multi-generational living

Give aging parents independence while keeping them close, or give adult children a real start without leaving the property.

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Property value

A permitted ADU adds durable, appraisable square footage — and makes your home far more compelling to a future buyer.

Why homeowners work with Big House

Local expertise

We know Vista, Oceanside, Carlsbad, Escondido and San Marcos zoning from the inside — what each city allows, and where the friction hides.

End-to-end guidance

Feasibility, design, permits, construction oversight and final support, coordinated by one team so nothing falls through the cracks.

Honest numbers

Clear cost ranges and realistic return projections up front, so you can decide with confidence instead of hope.

Trusted network

Architects, contractors and lenders we have actually worked with — not a list of names, a team that shows up.

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Common paths: garage conversion, attached, and detached build
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Team from feasibility study through finished unit
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Code- and permit-compliant, designed to pass the first time

How the process works

  1. Initial consultation

    We start with your goals and your property. What do you want the unit for, and what does the lot actually support? This sets the whole plan in motion.

  2. Feasibility study

    A detailed look at lot size, set-backs, zoning, utilities and design options — confirming what is possible before you spend on drawings.

  3. Design & permitting

    We shape a layout that fits how you live, then handle the drawings and permit submissions so the approval process moves smoothly.

  4. Construction management

    We coordinate vetted contractors, track the schedule and budget, and keep you updated at every milestone — no surprises.

  5. Completion & support

    Once your unit is finished we stay reachable for questions, adjustments and the small things that come up after move-in.

Not sure if your property qualifies? That is exactly what the first conversation is for. We will give you a straight answer on feasibility and rough cost before you commit to anything.

Common questions

How much does an ADU cost to build?
It depends heavily on the type. Garage conversions are the most affordable; attached and detached builds cost more because of foundations, utilities and site work. We give you a realistic range for your property during the feasibility stage — never a single misleading number for everyone.
How long does the whole process take?
From first consultation to a finished, permitted unit, most projects run many months across design, permitting and construction. Timelines vary by city and scope; we map the realistic schedule for your specific project up front.
Do I need a big backyard?
No. Many successful ADUs are garage conversions or attached units on ordinary suburban lots. Set-backs and lot coverage are the real drivers, and we assess those for your address.
Will an ADU really increase my home’s value?
A permitted, well-built ADU adds appraisable square footage and rental potential — two things buyers pay a premium for. We will help you weigh the build cost against the value and income it creates.

Ready to explore an ADU on your property?

Tell us about your home and your goals. We will tell you what is possible.

Get a free feasibility review
Call (760) 917-8588
Or reach Jason directly at [email protected]