Home Additions Built to Last for Chicagoland homeowners.
How ADS builds an addition: zoning check, engineered drawings, permits, footings and roof tie-in, and the schedule you get in writing.
- 12–20 weeksTypical timeline
- $80,000 – $250,000Typical price range
- 2-yrWritten warranty
- ★★★★★five-star Google reviews
- 15+ Years Building in Chicagoland
- Licensed & Insured $2M general liability
- 2-Year Warranty Written, on every project
- ★★★★★ Google five-star verified reviews
Get your free home additions built to last estimate
We call or text back within 2 business hours. No fees, no hard sell.
- Free on-site visit & written estimate
- Fixed price before work starts
- Licensed & insured · 2-year warranty
Prefer to talk? (224) 284-4533
Design concept
What a home addition with ADS covers
Bump-outs, full room additions, second stories, and kitchen or family room extensions. We carry the drawings and the permit, then build the foundation, framing, roof, windows, plumbing, electrical and heating, and the finished interior. The crew that frames the structure is the crew that finishes the inside.
How an addition runs
Zoning check. Before anyone talks about square footage, we check what your lot allows under your village’s rules, including setbacks, lot coverage and height. That sets the size of addition that is possible.
Structural drawings. The foundation, the framing and the connection to your existing house are engineered and drawn.
Permit. We submit the drawings and answer the village’s questions. Nothing is dug until the permit is issued.
Foundation. Footings go below the frost line and are inspected before the foundation work continues.
Framing, roof tie-in, dry-in. The addition is framed, the new roof is tied into the existing one, and windows, sheathing and roofing close it up against the weather. Most of this happens from the outside, so the wall into your house stays in place until late in the job.
Mechanicals and inspections. Plumbing, electrical and heating are run and inspected before insulation and drywall.
Interior and opening. Drywall, flooring, trim and paint, then the opening into the existing house. Final inspection, a walkthrough with you, and your 2-year written workmanship warranty.
Timeline and cost
Most additions take 12 to 20 weeks and cost $80,000 to $250,000. Drawings and permit review come first, and review times vary by village. You get the full schedule in writing before construction starts.
The biggest cost drivers are size, the foundation type (slab, crawlspace or full basement), a second story over the existing house versus building out, the roof tie-in, whether the new space includes a kitchen or bathroom, and how closely the siding, windows and roofline need to match the house.
What to have ready
If you have your plat of survey, it speeds up the zoning check. Tell us about any easements or HOA rules you know of. Plan for equipment access to the yard, and expect part of it to be a work zone for a while.
About our photos
There is no finished addition in our portfolio yet, and we are not going to borrow another builder’s pictures. The structural work behind an addition is on this site, though. You can see a staircase removed and rebuilt in a new spot in Lombard, a wall taken out to open a Lombard kitchen, and a 1,800 sq ft Glen Ellyn basement taken to the shell and rebuilt.
Thinking about adding on? Send the estimate form at the top of this page, and we call or text back within 2 business hours to set up a free visit with Brian on your lot. Get my free estimate
Three steps from first call to final walkthrough.
Free in-home estimate
We come to your home, measure, and listen. Written scope-of-work usually within 48 hours of the visit.
Detailed written quote
Materials, finishes, schedule — priced in person, line by line, in writing. You see where every dollar goes before you sign.
Build & final walk
Our in-house crew executes the agreed schedule. Punch-list walkthrough, then 2-year written warranty kicks in.
Book your free estimate
We respond to most inquiries within 2 hours on business days. Estimate visit is free, no pressure to sign that day.
Four guarantees we put in writing — before any work begins.
Most contractor horror stories trace back to four broken promises. We close all four in our contract, not in marketing.
2-Year Workmanship Warranty
Every joint, tile, fixture, and finish is backed for two full years. If our build fails, we come back and fix it — no charge, no debate.
Free On-Site Estimates
We assess your project in person and put the estimate in writing — line by line, free, no obligation. If anything changes on site, you hear it from us first, with numbers.
Fully Licensed & Insured
Illinois-licensed contractor, $2M general liability, workers' comp on every crew member. We bring proof of insurance before we bring tools.
In-House Team — No Subs
Same crew from demo day to final walkthrough. No subcontractor handoffs, no scheduling chaos, no "the other guys did that part."
Five questions every homeowner asks first.
Plain answers — the kind we'd give a neighbor over coffee, not the ones written for a brochure.
Have a different question? Ask during your free estimate →-
How much does a typical kitchen or bathroom remodel cost?
Bathroom remodels in our area typically run $18,000–$45,000. Mid-range kitchens are usually $35,000–$80,000 — full custom kitchens can reach $120,000+. We give you a detailed estimate in writing after the in-home visit, so you see the numbers line by line before signing anything.
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How long will my project take?
A bathroom is usually 3–5 weeks from demo to final walkthrough. A standard kitchen runs 6–8 weeks. Basement finishes are 5–8 weeks. We give you a written schedule before we start — and because we use our own in-house crew, we don't lose days waiting on a subcontractor to show up.
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Do you handle the permits and inspections?
Yes — every time. We pull the permits, schedule the inspections, and meet with the inspectors. You don't deal with the village. We handle Buffalo Grove, Arlington Heights, Lombard, Glen Ellyn, Wheaton, and the rest of our service area.
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Can we live in the house during the remodel?
Almost always, yes. We seal off the work zone with plastic, set up a temporary kitchen if we're remodeling yours, vacuum daily, and do a deep clean at the end. Most clients stay in the home for the full project — we plan the sequence around your daily life.
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How do payments work?
A small deposit at signing, then progress payments tied to milestones (rough-in complete, drywall complete, final walkthrough). You never pre-pay for work that hasn't started. Final payment is only released after you sign off on the final walkthrough — not before.