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Backyard Studio Small Studio Large Studio ADU 1 Bedroom ADU 2 Bedroom ADU Accessible ADU Custom Projects All models

Our process Our factory Features & Finishes Warranty Check my lot

Pricing & Financing

Pricing Overview Financing Rental & ROI

Resources

ADUs in California ADU for rental income ADU for parents Backyard Office ADU Guides Gallery FAQ

(209) 214-6845 Get Started

Models

Backyard Studio Small Studio Large Studio ADU 1 Bedroom ADU 2 Bedroom ADU Accessible ADU Custom Projects All models

How It Works

Our process Our factory Features & Finishes Warranty Check my lot

Pricing & Financing

Pricing Overview Financing Rental & ROI

Resources

ADUs in California ADU for rental income ADU for parents Backyard Office ADU Guides Gallery FAQ

Factory-built backyard homes and ADUs, made in California

Book a call Book a Tour

Models Pricing FAQ Contact

Models

Backyard Studio Small Studio Large Studio ADU 1 Bedroom ADU 2 Bedroom ADU Accessible ADU Custom Projects All models

Pricing

Pricing Overview Financing Rental & ROI Features & Finishes

Resources

ADU Guides Our Process ADU for rental income ADU for parents Backyard Office Gallery FAQ

Company

About Factory Warranty Contact

ADUs by city

All of California Los Angeles San Jose San Francisco San Diego Sacramento Oakland

Mon–Fri6 am – 5 pm17100 S Harlan Rd, Lathrop, CA 95330(209) 214-6845concierge@baymodular.com

HCD-approved plans #1585366 · Factory in Lathrop, CA

© 2026 Bay Modular Inc. All rights reserved. · CSLB #1112074 · HCD #1585366 · California HQ

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Ready to start?

Start with Bay Modular

Submit your information and our team will get back
to you about next steps

Free lot checkCheck my lot

J

Julia from Bay ModularI read every answer

Before you go – did we miss something?

One tap helps us make this page better for the next family.

Totally fair – it’s a big decision.

Here are the numbers to take with you. All-in prices, permits to keys.

Backyard Studio120 sq ft$75,900 Small Studio256 sq ft$124,900 Large Studio ADU320 sq ft$154,900 1 Bedroom ADU480 sq ft$214,900 2 Bedroom ADU640 sq ft$271,900

Launch pricing: 30% off our published home prices through Dec 31, 2026.

See what’s included

Thanks for being honest.

Many quotes are for the building only. Ours is the whole project:

Design, permits and city fees
Site prep, foundation, delivery and crane
Utility hook-ups and final inspection

Find the best way to pay See what it could rent for

Let’s find out – for free.

We check zoning, setbacks, utilities and crane access, then send a fixed price for your address. About 3 days, no obligation.

Next you’ll add your contact details on our lot-check form.

Sorry about that. What were you looking for?

We’ll add it to the site – and reply if you leave an email.

We only use your email to answer. Privacy

Here’s the whole process on one page.

From a free lot check to keys in about 4–6 months, with one team.

See the 6 steps Read the FAQ Ask us: (209) 214-6845

Good idea – it’s a family decision.

Send this page to the people who’ll decide with you.

Bring them on a factory tour

I’m listening.

What stopped you today?

We only use your email to answer. Privacy

Thank you – really.

Answers like yours shape what we build next.

Quick question before you go?One tap · 5 seconds

Bay Modularnow

Your free 7-day ADU plan

One short message a day: costs, permits, rent. Tap to start.

Free · 7 emails + occasional updates · unsubscribe anytime

You’re in! Day 1 arrives tomorrow.

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Blogs

101 Guides

Quick Guide to Types of ADUs

Apr 23, 2020

POPULAR

101 Guides

Quick Guide to Factory Built Housing

May 13, 2020

101 Guides

Why We Offer Free Property Assessments and What To Expect

May 21, 2020

Ready to start?

Start with Bay Modular

Submit your information and our team will get back
to you about next steps

Free lot checkCheck my lot

Bay Modular
HCD # 1585366
(209) 214-6845

Factory Visit (by Appointment Only)
17100 S Harlan Rd
Lathrop, CA 95330

About Us
Our Process
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Thank you for your interest! You can read more about our company, models, and ideas in our online Guides.