Why Garages Come Down for ADUs
There are two ways a garage figures into an ADU project. A garage conversion keeps the structure and turns the interior into living space — cheaper, but you inherit the garage's footprint, ceiling height, and often its problems. A teardown and new build removes the garage entirely and puts a purpose-built ADU in its place, usually on a new engineered foundation.
Designers increasingly steer clients toward the teardown when the existing garage is old, out of square, sitting on cracked flatwork, or too small for the unit the lot allows. In those cases, demolition isn't a setback — it's the first scheduled line of the build.
Do You Need a Permit to Demolish a Garage in San Diego?
Generally, yes. Detached structures over 120 square feet typically require a demolition permit, and a garage almost always exceeds that. The good news: when the teardown is part of a permitted ADU project, demolition is usually handled within the project's overall permit package rather than as a separate homeowner errand. Requirements vary by city within San Diego County, so confirm with your builder or designer — or ask us and we'll help clarify for your specific situation.
Utilities Come First
Many older San Diego garages have electrical service — some have gas or water too. Every line serving the structure must be safely disconnected before demolition begins. This is a scheduling item, not a technicality: an experienced demo crew will coordinate the teardown date around your disconnect timeline and verify the site is safe before work starts.
The Slab Question: Keep It or Break It Out?
This is the decision that most affects your demo scope, and it belongs to your builder's engineer — not the demo crew:
- Break it out (most common): Most ADU designs call for a new engineered foundation, which means the old slab, footings, and stem walls come out with the structure. Concrete is heavy and dump facilities charge by the ton, so slab removal is a real share of the demo cost.
- Leave it: Occasionally a plan works around existing flatwork, or the slab stays temporarily as a staging surface. In that case the structure comes down and the slab stays untouched.
Either way, get the answer from your plan set before you collect demo quotes — it's the difference between two meaningfully different jobs.
What Demo Day Actually Looks Like
A typical single- or two-car garage teardown runs one to two days including haul-off:
- Protection first. Fences, trees, irrigation, and anything staying gets protected or flagged.
- Structure down. Roof, walls, and framing come down in a controlled sequence — not one dramatic push.
- Slab out (if specified). Concrete gets broken, loaded, and staged for hauling.
- Everything hauled. Wood, stucco, roofing, and concrete leave the site the same job. No debris pile sitting in the yard for weeks.
The handoff standard to ask for: a grade-clean site your foundation crew can walk onto without touching a rake.
What Does Garage Demolition Cost?
Garage teardowns are quoted by scope, and three things drive the number:
- Size and construction — a stick-built single-car garage is a different job than an oversized two-car with a heavy tile roof.
- Slab scope — breaking out and hauling concrete adds tonnage, and disposal is priced by weight.
- Access — alley access with room for a trailer is fast; hand-carrying debris through a narrow side yard is not.
Beware of quotes that separate "demo" from "haul-off" — a cheap teardown price means little if the debris removal is billed later. We quote everything as one upfront number: demolition, labor, hauling, and disposal fees included. For smaller structures, our standing ranges apply: sheds typically $300–$500 and decks $400–$800 (see our demolition services page).
Where the Debris Goes
Garage debris is mostly recyclable. Concrete and asphalt get crushed and reused as base material, clean wood is separated, and metal is recycled. San Diego's construction and demolition (C&D) diversion rules reward this — and it's one reason licensed crews with established disposal relationships can price competitively against a DIY dumpster approach.
Tearing Down a Garage for Your ADU?
D-63 licensed demo, slab removal, and haul-off — one crew, one upfront price, build-ready handoff.
Frequently Asked Questions
Can I demolish the garage myself to save money?
Physically, maybe — but you still need the permit, the utility disconnects, a plan for several tons of debris, and a site your foundation crew will accept. Most homeowners who price out dumpster rentals, dump fees, and their own weekends find professional demo costs less than they assumed, and it keeps the ADU schedule intact.
Should I demo before or after my ADU permit is issued?
Talk to your builder first. Demolition is often covered within the ADU project's permit package, and tearing down early without that paperwork can create headaches. Once the project is permitted, demo is usually the first item on the construction schedule.
Do you coordinate directly with my ADU builder?
Yes — we prefer it. We regularly work as the demo subcontractor for ADU builders and designers: scheduled demo windows, certificate of insurance on request, and a grade-clean handoff documented with photos. One line item covers teardown, haul-off, and disposal.
What else should come off the site besides the garage?
Usually more than people expect — old sheds, decks, fencing in the build path, overgrowth, and years of stored junk. We put together a full rundown in our ADU site prep checklist.