San Diego's Most Trusted ADU, Design & Permit Team — One Point of Contact, Start to Finish

Accessory dwelling units

ADUs in San Diego County

Junior, attached and detached accessory dwelling units — designed, permitted and built by one accountable team.

Not sure which?

Which one is yours?

Junior, attached and detached, compared side by side — the size rules, where each sits, and how plans connect to price.

Carved out of the existing house, inside its current walls.

  • Maximum500 sq ftGov. Code §66313
  • Must sitInside the existing houseGov. Code §66313
  • BathroomMay share with the houseGov. Code §66333

Shares at least one wall with the main house.

  • City cannot cap below850 sq ftGov. Code §66321
  • With 2+ bedrooms1,000 sq ftGov. Code §66321
  • KitchenFull, independent

A standalone structure in the yard.

  • City cannot cap below850 sq ftGov. Code §66321
  • Height a city must allow16 ftGov. Code §66321
  • At 4 ft setbacksAt least 800 sq ftGov. Code §66321
Cost is driven by size, not by type — the same size-band figures apply to junior, attached and detached alike.
ADU design company in San Diego
Is this you?

When this is the right call.

What’s involved

How the project runs.

01
STEP ONE

Feasibility

Lot, zoning and setback check before any drawing work begins.

02
STEP TWO

Design

Plans drawn to clear plan check, not only to look good.

03
STEP THREE

Permit

Submittal, corrections and city liaison handled by us.

04
STEP FOUR

Build

Construction and project management to final inspection.

On site

What a detached ADU looks like going up

41 sec Timber framing and a drone pass over a two-storey detached ADU under construction.

Rules that apply.

Limits vary by jurisdiction. These are the levers that decide what fits on your lot — we confirm every one of them against your city before design starts.

  • Parking a city may requireAt most one space per unit or per bedroom, whichever is fewerGov. Code §66314

These are California state minimums — the floor every city has to allow. Your jurisdiction may permit more, and applies its own setbacks, height and design rules on top. We confirm all of it against your address before design starts. See regulations by city. Statutes reviewed 4 August 2026.

What it costs

Two numbers to plan around.

Our smallest size band — a detached or attached unit around 400 sq ft. Pick a size to see how it moves.

Project size (sq ft)

ADUs run 100–1,200 sq ft. The smallest band is priced on a representative project of about 400 sq ft.

Our fee

$5,750

Drawings, structural, Title 24 and permit coordination — a fixed scope we quote up front.

Construction

$152,000–$200,000

The one that really moves — finish level, site conditions and access. Only meaningful once we have seen your lot.

ADUs run 100–1,200 sq ft. The smallest band is priced on a representative project of about 400 sq ft.

Our fee

$12,775

Drawings, structural, Title 24 and permit coordination — a fixed scope we quote up front.

Construction

$262,500–$352,500

The one that really moves — finish level, site conditions and access. Only meaningful once we have seen your lot.

ADUs run 100–1,200 sq ft. The smallest band is priced on a representative project of about 400 sq ft.

Our fee

$16,800

Drawings, structural, Title 24 and permit coordination — a fixed scope we quote up front.

Construction

$379,500–$517,500

The one that really moves — finish level, site conditions and access. Only meaningful once we have seen your lot.

Estimates for planning, not a quote. Your feasibility report replaces every number here with figures for your actual property — and the consultation that starts it is free.

Start with a free consultation.

Under an hour, no pressure — we talk through what your lot allows and give you a ballpark for your property. No charge, and no obligation to go further.