ADUs in San Diego — Unlock the Hidden Potential of Your Property
As housing demand continues to rise, many San Diego homeowners are discovering a smart, flexible way to expand living space — the Accessory Dwelling Unit (ADU). At Treadlight Construction, we’ve embraced this trend, helping homeowners build high-quality, code-compliant ADUs that maximize property value and living options. Here’s why ADUs are so compelling — and what to know before you build.
What’s an ADU — and Why Does It Make Sense in San Diego?
An ADU (Accessory Dwelling Unit) is a secondary, self-contained living space on the same lot as your main home. It can be:
Detached (backyard cottage)
Attached (added onto the house)
Or converted from an existing structure (like a garage)
For San Diego homeowners, ADUs are growing in popularity because:
They add property value and usable square footage. An ADU expands your home’s footprint, increasing equity and resale potential.
They offer rental or income potential. Whether long-term or occasional, an ADU can generate passive income — or offset mortgage costs.
They provide flexible living arrangements. Great for extended family — aging parents, young adult children — or guests. It’s a smart way to accommodate changing household needs without buying a new home.
They’re increasingly feasible under updated laws and regulations. San Diego has adopted more ADU-friendly rules, making building or converting space easier than in the past.
Key Steps & Considerations When Building an ADU
If you’re considering an ADU, here’s what to think about:
Zoning, permits & code compliance: ADUs require planning approval, adherence to local zoning and building codes, setbacks, parking and safety standards. Working with an experienced contractor — one familiar with San Diego’s ADU regulations — is essential.
Design, layout & utility connections: Whether you go with a studio, one-bedroom, or larger layout, consider plumbing, electrical, heating/AC, insulation — just like a regular home.
Budget realistically: According to recent cost breakdowns, building a detached ADU in San Diego typically costs in the range of $375–$600+ per square foot, depending on size and finish quality — meaning a full project can end up between $200,000 to $450,000+, including soft costs like permits and utilities.
Plan for timeline: From design and permitting to final construction, the entire process could take 10–16 months, depending on permit approval time, city backlog, and complexity of the build.
Why Treadlight Construction Is Your Ideal ADU Partner
At Treadlight, we bring more than just construction experience. We offer:
Deep knowledge of San Diego’s permit and zoning landscape — critical for a smooth ADU build.
Commitment to sustainable, quality materials and craftsmanship — ensuring your ADU isn’t just built fast, but built to last.
Full-service project management — from design and planning, through permit applications, construction, and finishing.
Flexibility and transparency — helping you understand costs, timeline, and get real value for your investment.
Is an ADU Right for You? Ask Yourself…
Do you have space on your property (backyard, garage, side yard) that could support a unit?
Are you looking to generate income, house family/guests, or add long-term value?
Are you ready to commit to the process — design, permitting, construction, inspections — to ensure the build is sound and legal?
If yes, an ADU might just be one of the smartest investments you make for your home. When done right, it adds space, flexibility, and equity — for now and the future.
