Ellery ADU Studio in Rhode Island
Ellery ADU Studio designs, permits, and builds accessory dwelling units across Rhode Island under a single contract with a single written price. No designer blaming the builder. No builder pointing back at the drawings. Since 2015, we’ve completed 900+ ADUs, and every one of them started the same way: a written price before any work began, per Haven Standard Clause 1. Rhode Island homeowners get the full Ellery Adu Studio specialists model here: the permit set treated as the product, a documented photo record on every visit, and a 365-Day Done Right Promise in writing before the project starts.
Why Rhode Island Homeowners Choose Ellery ADU Studio
Most ADU projects derail in the gap between what the designer drew and what the builder actually framed. Ellery closed that gap by making both sides one contract, so the drawings, the permit set, and the construction all answer to the same written price. That matters in Rhode Island, where older housing stock and compact lots make thoughtful ADU work harder than it looks-just as Ellery ADU Studio in South Carolina - ADU projects face similar challenges. We design and build new detached ADUs, garage conversions, junior ADUs and interior conversions, and site prep and utilities, all under the same roof. We also specify and coordinate prefab and modular systems from Abodu, Cover, Dvele, Mighty Buildings, Boxabl, Plant Prefab, Tuff Shed, and James Hardie, so if a prefab path fits your lot, it stays inside the same contract instead of becoming a second vendor to manage. Every crew is background-checked and uniformed, and our license number appears on every page, not just the bottom of a bid. When the work is done, you receive a documented photo record of what was found and what was built, not a summary of how it felt. And the 365-Day Done Right Promise says it plainly: if the finished ADU is not built to the permitted drawings, we make it right, in writing, before the project starts.
Backed by the Haven Family

Ellery ADU Studio carries the Haven Standard, five published clauses that govern every job across Rhode Island: the price in writing before work starts, a real arrival window with a named technician, licensed, insured, background-checked crews with the license number published, photographic evidence of what was found on every visit, and no upsell at the door. We’re independently owned and operated, and agreeing to those five clauses is the entire condition of carrying the Haven name, a standard also upheld by Ellery ADU Studio in South Dakota - ADU teams. A haven is somewhere nothing bad is going to happen to you. That’s the condition Rhode Island homeowners are buying back when they call us.
Written by the team at Ellery ADU Studio, serving Rhode Island since 2015.
Before
After