ADU

Q: How fast can you start an ADU project?

Design and permitting timelines depend on your city's review queue, but Ellery can typically begin the site assessment and feasibility work within a week of your first call. The studio provides a realistic schedule in writing before you commit, based on your specific jurisdiction and project type. Call us today to get a site assessment on the calendar.

Q: What areas does Ellery ADU Studio serve?

Ellery serves metro Sacramento and the surrounding communities, including Natomas, East Sacramento, Land Park, Elk Grove, Roseville, Folsom, Citrus Heights, Rancho Cordova, and Davis. Each market has its own permitting quirks, and the studio's permit history spans all of them. If you are near the region, call and ask about your specific address; we will tell you straight whether we can take the project.

Q: What does the 365-Day Done Right Promise cover?

The promise is in writing before the project starts: if the finished ADU does not match the permitted drawings, Ellery makes it right at no additional cost to you. That goes beyond a typical workmanship warranty, because it anchors the guarantee to the permit set itself, the same document your inspector signs off on. You get the promise in writing, per Haven Standard Clause 1, before any work begins.

Q: Will the price change once the work starts?

No. Every Ellery ADU project is quoted with a written price before any work begins, and that price is agreed to before the contract is signed. The studio does not run change orders for scope it should have seen in the initial assessment. If site conditions genuinely change mid-project, you get a written amendment before any additional work proceeds. You will never face an invoice that exceeds the number you approved. Call now for a free second opinion on any written estimate you already have in hand. Written by the team at Ellery ADU Studio, a Haven family brand serving Sacramento since 2015.

An ADU is the single highest-value square footage most California homeowners can add to their property, and the single easiest project to get wrong. Haven connects you with an independently owned ADU studio that has designed, permitted, and built more than 900 accessory dwelling units since 2015, each one delivered under a single written contract with a fixed price agreed before anyone picks up a hammer. No designer pointing at the builder. No builder shrugging at the drawings. Just one company, one price, one point of accountability from first sketch to final inspection.

What’s Included

Ellery ADU Studio, a Haven family brand, handles the full spectrum of accessory dwelling unit work as a design-build studio, not a general contractor. Every project below runs through the same five-clause Haven Standard, and every one starts with a written price.

ADU Design & Permitting

The permit set is the core product here, not an afterthought. Ellery’s design team produces drawings, structural calculations, title 24 energy compliance, and the full submittal package for your city or county. Since 2015, the year California’s ADU permitting rules were overhauled, the studio has shepherded more than 900 permit sets through approval. You receive the drawings and the permit strategy in writing before construction is ever scheduled.

New Detached ADU

A ground-up detached unit gives you full control over layout, light, and privacy. Ellery handles everything from foundation to finishes under one contract, including site prep, utility connections, and the final occupancy inspection. Every project includes a documented photo record at completion, so you can see exactly what was built against what was permitted.

Garage Conversion

Converting an existing garage is typically the fastest path to a rentable or livable unit because the envelope already exists. Ellery evaluates the slab, framing, electrical service, and sewer lateral before quoting, then converts the space to conditioned living area with its own entry, kitchen, and bath. In older Sacramento neighborhoods like East Sacramento and Land Park, we regularly find undersized panels and slab cracks that a permit-ready plan has to address up front.

Junior ADU & Interior Conversion

A JADU converts existing interior space, like a large bedroom or bonus room, into an attached unit with its own entrance and efficiency kitchen. These projects carry a lower price point and move through permitting faster in most jurisdictions. Ellery confirms your city’s specific JADU requirements before the design work begins, because they vary block by block in some metro areas.

Site Prep & Utilities

Every ADU needs water, sewer, power, and often a new or upgraded panel before the framing starts. Ellery’s crews handle trenching, lateral connections, panel upgrades, and grading as part of the same written contract. No separate site contractor, no change order when the ground turns out to be clay or rock, because the site work is scoped and priced at the start.

Prefab & Modular Coordination

When a prefab or panelized system makes sense for your site, Ellery specifies and coordinates it within the same single contract. The studio has direct experience working with Abodu, Cover, Dvele, Mighty Buildings, Boxabl, Plant Prefab, Tuff Shed, and James Hardie systems. You get one accountable party for the factory unit and the site work alike, so a shipping delay or a tolerance issue never becomes your problem to mediate.

Why Homeowners Choose the Haven Family

Diverse team of professional garage door technicians standing before company vans. — Why Homeowners Choose the Haven Family

Haven was founded in 1998 on a simple observation: good home-service companies were being bought by roll-ups that put a call center between the customer and the crew, and the work suffered. So Haven made the opposite bet. Leave the local brand, the local crews, the local license exactly as they are, and standardize only the thing customers actually complain about, which is not workmanship. It is not knowing. Not knowing the price before the van arrives, not knowing who is coming into the house, not knowing what was found or what was done. Haven wrote five clauses covering exactly that, published them, and made agreeing to them the entire condition of carrying the name. Ellery ADU Studio chose to sign. The studio has designed, permitted, and built more than 900 ADUs since 2015, and every one of them carried a written price before work started, a documented photo record when work was complete, and the 365-Day Done Right Promise: if the finished ADU is not built to the permitted drawings, Ellery makes it right, in writing, before the project starts. That is what the Haven name means. A haven is somewhere nothing bad is going to happen to you. Here, it is the condition you are buying back when you sign the contract.