ADU Specials in Corona, CA
We’re running these offers because Corona homeowners deserve to know what an ADU project costs before anyone picks up a hammer. Call (951) 476-3715 and we’ll tell you exactly which specials apply to your property. Every offer below pairs with our written-price guarantee under Haven Standard Clause 1, so the number you hear is the number on the contract.
Current Offers
Free Second Opinion on Any Written ADU Estimate
Already have a quote for a garage conversion, detached ADU, or JADU in Corona? We’ll review the scope, the line items, and the permit strategy, then tell you where we agree and where we’d do it differently. No charge, no obligation to hire us. We’ve caught $8,000 slab-underestimates and missing fire-separation details on Corona projects before.
Valid through December 31, 2026. Mention this offer when you call (951) 476-3715.
365-Day Done Right Promise, Documented in Writing Before We Start
This isn’t a discount, it’s a guarantee no other Corona ADU builder puts in the contract. If your finished ADU doesn’t match the permitted drawings, we make it right. Nadia Ellery signs this promise on every project before the first deposit clears. In Corona’s Dos Lagos neighborhood, we re-leveled a foundation stem wall at month nine because the grade settled differently than the soils report predicted. We handled it. No argument, no invoice.
Valid through December 31, 2026. Mention this offer when you call (951) 476-3715.
Documented Photo Record Included on Every Visit
Most Corona ADU contractors hand you a checklist at the end. We hand you timestamped photos of what we found and what we did. Foundation prep in Corona’s Sierra Del Oro area, where the clay soil holds moisture differently than the flatlands near Ontario Avenue? You’ll see the rebar layout before the pour. Electrical rough-in above a garage conversion? You’ll see every staple and stud guard. This is standard on every project, but we list it here because some homeowners don’t realize other builders skip it.
Valid through December 31, 2026. Mention this offer when you call (951) 476-3715.
Written Price Before Any Work Starts - Haven Standard Clause 1
Every Corona ADU project we take gets a line-item quote in writing before a shovel hits dirt. Garage conversions in the Corona Hills area typically run $85,000-$140,000 all-in, drawings through final inspection. New detached ADUs in the older grid near Grand Boulevard, where setback variances are more common, usually land between $180,000 and $320,000 depending on utility trenching length. Junior ADUs and interior conversions start lower, often $45,000-$75,000 when the existing structure and utilities cooperate. The point isn’t the range, it’s that your specific number is locked at signing. Under Clause 5 (No Surprises), the scope doesn’t grow after you sign.
Valid through December 31, 2026. Mention this offer when you call (951) 476-3715.
Live Person Answers Calls 24/7 - No Voicemail Queue
Call (951) 476-3715 at 10 PM on a Sunday because you found our site after dinner and you’re wondering if your Corona lot qualifies for an ADU. A real person picks up. They can’t redesign your foundation at that hour, but they can book your free estimate, explain which specials apply, and send you our pre-qualification checklist so the site visit is productive. We’ve answered calls from Corona Village, from Horsethief Canyon, from the new builds off Rincon Street. Same standard every time.
Valid through December 31, 2026. Mention this offer when you call (951) 476-3715.
One-Contract Design-Build, No Designer-Builder Finger-Pointing
Most Corona ADU projects split design and construction into separate contracts. When the slab cracks or the roofline doesn’t match the rendering, each side blames the other. Our model covers ADU Design & Permitting, Garage Conversion ADU, New Detached ADU, Junior ADU & Interior Conversion, and ADU Site Prep & Utilities under a single contract with one written price. On a recent garage conversion near Lincoln Park, the city asked for a fire-rating revision mid-permit. We revised the drawings, resubmitted, and absorbed the coordination cost. No change order. No “talk to your designer” runaround.
Valid through December 31, 2026. Mention this offer when you call (951) 476-3715.
How to Redeem
Step 1: Call and mention the offer. Dial (951) 476-3715, tell us which special caught your attention, and we’ll confirm it applies to your Corona property type.
Step 2: Book your free site visit. We’ll walk the lot or existing structure, check setbacks against Corona’s current ADU ordinance, and flag any utility or access constraints specific to your neighborhood.
Step 3: Review your written quote. The offer terms are built into your Haven Standard contract from day one. No separate coupon to remember, no expiration anxiety. The price is the price.
Before
AfterWhat These Offers Don’t Cover
We don’t discount quality. We don’t run “first 10 callers” urgency or seasonal percentage-off sales that expire Friday. What we offer is transparency, documented in writing, backed by 900+ ADUs designed, permitted, and built since 2015. Every one started with a written price. Every one finished with a photo record. That’s the Haven Standard, and it’s how we work in Corona whether you found us through this page or your neighbor’s referral.
Questions about which offer fits your Corona ADU project? Call (951) 476-3715 and a live person will walk you through it.
Written by Nadia Ellery, Owner at Ellery ADU Studio Corona, serving Corona since 2015.