Permit guides

ADU Permits in Newark: a Homeowner's Guide

Newark ties your ADU's maximum size to your lot size — and it's rewriting its ADU rules right now. Here's where things stand.

Last updated October 2026. Rules change; always confirm current requirements with the city before you build.

Who handles your permit

ADU permits in Newark run through the Community Development Department — start with the Planning Division to confirm your project, design-review triggers, and applicable regulations, then file the building permit with the Building Inspection Division. Most ADU projects need only a building permit; a second-story addition taller than 16 feet triggers design review.

What you can build

Newark's distinctive lot-size-based limits:

600–1,200 sq ftMax ADU size scales with lot size

16 ftHeight limit (18 ft in certain zones)

4 / 20 ft4 ft side/rear, 20 ft front setbacks

40%Max lot coverage

1 + 1One ADU plus one Junior ADU per single-family lot

60 daysDeadline to act on a complete application

Detached ADUs must sit in the rear yard, and exteriors must match the primary residence's architectural style and materials. One off-street space per ADU unless within a half-mile of transit.

Size depends on your lot

Newark is unusual: the maximum ADU size steps up with lot size — roughly 600 sq ft on lots under 7,000 sq ft, up to 1,200 sq ft on lots of 20,000+. Lots under 7,000 sq ft are the hardest case, so verify your lot's bracket with Planning before designing.

The city is also mid-rewrite: staff are preparing an updated ADU ordinance with incentives (reduced impact fees, adjusted parking/height/size) plus an AB 1332 pre-approved plan program using third-party architectural plans. Both were in progress through 2025 — confirm what's adopted before you rely on it.

Utility-wise, Newark runs through outside districts: Union Sanitary District, Alameda County Water District, and PG&E each may have their own requirements.

Check the lot bracket first. In Newark, lot size determines what you can build — that one number drives the whole design.

What goes into the submittal

Newark's published next steps:

Contact the Planning Division first to confirm regulations and design-review triggers
Review the city's ADU regulations and zoning code
Coordinate early with Union Sanitary District, Alameda County Water District, and PG&E
Prepare the submittal package: site plan, floor plans, elevations, construction drawings
File the building permit application with the Building Inspection Division

Where applications usually get stuck

Lot-size caps. A small lot caps the ADU at 600 sq ft regardless of what fits physically.
40% lot coverage. An independent cap that can bite on smaller lots.
Second-story trigger. Anything taller than 16 feet as a second-story addition needs design review.
Three utility providers. Each district has its own requirements and timelines.

Not sure where to start? That's the part we do. We look at your property, map the requirements, coordinate the plans and specialists, and manage the submittal and corrections — one point of contact.

Tell us what you need help with.

Not sure where to start? That's what we're here for.

Send your project

Erik — (916) 540-8960 · Vall — (916) 956-8106
office@pcg-engineering.pro