ADU Builder in San Marcos
Permitted ADUs in San Marcos, with a free 3D rendering before we start.
Planning a ADU in San Marcos? San Marcos mixes newer planned communities with older neighborhoods and hillside lots. Proactive Edge Developments is a CSLB-licensed San Diego County general contractor. We build ADUs end to end, handle the City of San Marcos permit process, and include a free 3D rendering so you see the result before we start. License CSLB #768545.
Permits for a ADU in San Marcos
San Marcos regulates ADUs under Municipal Code Chapter 20.410. Its PRADU program offers pre-approved one-story detached plans, and custom ADUs go through a standard building permit. Source: City of San Marcos, Municipal Code Chapter 20.410.
State timeline: when there is already a home on the lot, California law (Gov. Code §66317) requires the city or county to approve or deny a complete ADU application within 60 days.
We prepare the plan set, submit it, answer plan-check corrections, and schedule every inspection through final sign-off.
What your San Marcos ADU includes
- Detached & attached ADUs. Standalone backyard units or additions attached to your existing home, designed to maximize rentable square footage on your lot.
- Permit & plan coordination. We manage the entire San Diego ADU permitting process — code compliance, plan checks, and approvals — so you don't have to.
- Built for rental income. Every ADU is designed around return: livable layouts, durable finishes, and a footprint that appraises and rents.
- Free 3D rendering. See your finished ADU before we build it, with our in-house design software — included free for every new client.
Featured project: the Curlew St lot split
At 3680–3682 Curlew St in San Diego, we added a second story to the main house and converted the garage into a separate unit. The owner now has two rentable addresses on one lot. It's the project we point San Marcos homeowners to first, because it shows our permitting, structural, and finish work in one place.
Get your project rendered free.
Every new client gets one free 3D rendering, made with our in-house design software — so you see the finished result before a single nail goes in.
ADU Builder in San Marcos, answered.
Who issues ADU permits in San Marcos?
San Marcos projects are permitted by the City of San Marcos (Development Services). San Marcos regulates ADUs under Municipal Code Chapter 20.410. Its PRADU program offers pre-approved one-story detached plans, and custom ADUs go through a standard building permit.
How long does ADU approval take in San Marcos?
Under California law (Gov. Code §66317), when there is already a home on the lot, the City of San Marcos has to approve or deny a complete ADU application within 60 days. Plan corrections and resubmittals add time, so we give you a written schedule at your estimate.
Have you built in San Marcos?
We work across San Diego County. Our featured project is the Curlew St lot split in the City of San Diego; ask us for the closest completed work to your address during your consult.
What does the free 3D rendering include?
One rendering of your San Marcos ADU, made with our in-house design software, so you see the result before construction starts. No cost and no obligation.
Get your free rendering.
Tell us about your project and we'll create one free 3D rendering with our in-house software, plus a free on-site estimate. No cost, no obligation.
We'll only use your details to discuss your project. No spam, ever.