Hinsdale, IL 60521 · Design-build since 2013

Attic Conversions and Bonus Rooms in Hinsdale

Assembly Squad Remodeling turns Hinsdale attics into rooms the code recognises as living space: bedrooms with a bath, home offices, playrooms, gyms and guest suites. The finishes are the easy part. What decides whether the project works is underneath them — standing height, what the floor can carry, a stair that meets code, insulation and heat, and a way out that is not the staircase. One team draws it, files the Village of Hinsdale permit and builds it under one fixed-price contract.

Height and floor load checked firstEgress to code2-year workmanship warrantyFixed-price contract
Get a free consultation →Call (312) 544-9150
Hinsdale, IL 60521
2026 Pricing

What does an attic conversion cost in Hinsdale?

Our 2026 pricing. An attic conversion is the alternative to building an addition, which is why the comparison below matters more than the headline number.

Bonus room$55K–$80KOffice, playroom or gym · no bathroom, no dormer
Bedroom with a bath$80K–$110KEgress, plumbing run up, full bath · 8–14 weeks
Adding a dormeradd $25K–$60KWhere there is not enough standing height to start
Versus an addition$200,000The median Hinsdale addition permit in 2026

That last figure is the point. The Village of Hinsdale issued 12 addition permits between January and August 2026 with a median stated construction value of $200,000. An attic conversion buys a room for a third to a half of that, without giving up garden. Across all 643 permits we read, not one was a standalone attic conversion — dormers appeared twice, both attached to larger projects. We read all 643 Village permits for 2026

What We Build Up There

What do we turn a Hinsdale attic into?

Bedrooms with a bath, home offices, playrooms, gyms and guest suites — plus the framing, stairs, insulation, heat and egress that turn storage into a room the code recognises as living space.

Bedroom with a bathEgress, plumbing run up, full bathPrice a bedroom →Office, playroom or gymA bonus room, no plumbing, lighter permitPlan a bonus room →Dormers and headroomWhere standing height has to be builtTalk through height →Knee-wall storageBuilt-ins where the roof slope kills headroomCustom cabinets →Basement remodelingThe other way to find space · $65K–$150KHinsdale basements →What Hinsdale spends643 Village permits, read one by oneThe 2026 permit report →
Village Rules

Do I need a permit to remodel in Hinsdale?

Usually yes — the Village of Hinsdale lists remodels, renovations and alterations as permit work, and only cosmetic jobs like painting, trim and flooring are exempt. Two things set the calendar before a wall comes down, and one thing you should ask every contractor for.

When you need a permit

The Village lists remodels, renovations and alterations as permit work, along with additions, new construction, foundation repairs, decks and patios, driveways, fences, generators, solar panels, pools, water heaters, water service work and the demolition of any structure.

No permit is needed for one-for-one replacement of single-family windows, doors, siding and roofing, or for painting, millwork and trim, or flooring and refinishing.

Source: Village of Hinsdale, Permit Requirements, checked Sept 2026 · Building Department (630) 789-7030

Landmarked homes

Hinsdale lists 25 designated landmarks — 20 individual properties plus five on the National Register. A landmarked home needs a Certificate of Appropriateness from the Historic Preservation Commission before exterior work, and it has to be in hand before the permit issues.

Interior-only work on a house that is not landmarked does not go through that review. We check the designation before the design is finalised.

Source: Village of Hinsdale, checked Sept 2026

Ask any contractor for these three

The Village registers general contractors, and the bar is public:

  • Current Village of Hinsdale registration — $250 a year, $125 after July 1
  • A signed $10,000 surety bond for the full licence year
  • A certificate of insurance at $500,000 / $1,000,000 combined single limit
  • The Village named as certificate holder and additional insured

Source: Village of Hinsdale, Contractor's Registration, checked Sept 2026

The Local Record

What Hinsdale Actually Spends

Not a national average — every building permit the Village of Hinsdale issued between January and August 2026.

Permits read643Every permit the Village issued, Jan–Aug 2026
Median project$71,950Across 98 residential permits with a stated value
Remodel permits93Against 12 new houses at a median $1,100,000
Above $500K2Out of 98 residential projects, all year

Source: the Village of Hinsdale's monthly permit reports, checked Sept 2026. The money column is the construction value stated by the applicant, not a final invoice. We wrote up the whole dataset: what a Hinsdale remodel actually costs.

How It Works

From First Visit
to Final Walkthrough

The same four steps on every Hinsdale project, with the Village built into the schedule.

Week 1
Consultation

At your home in Hinsdale or at our Lincoln Park studio. We measure, listen and talk budget openly.

Within 48 hours
3D Design & Fixed Price

3D renderings and a fixed-price, line-item proposal, so you know the number before anything is ordered.

Before demo
Village Permit & Review

We prepare and file the Village of Hinsdale permit, and the Certificate of Appropriateness when the home is landmarked.

Build
Our Crews Build It

One team from demolition to the last punch-list item, backed by a two-year workmanship warranty in writing.

Client Reviews

Straight From Google

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FAQ

Attic Conversions and Bonus Rooms in Hinsdale: Common Questions

A bonus room — an office, playroom or gym with no bathroom and no dormer — runs $55,000 to $80,000 in our 2026 pricing. A bedroom with a full bath runs $80,000 to $110,000 over eight to fourteen weeks. Adding a dormer where there is not enough standing height adds $25,000 to $60,000 on top.
Usually by a wide margin. The Village of Hinsdale issued twelve addition permits this year with a median stated construction value of $200,000. An attic conversion buys a comparable room for a third to a half of that, and it does not take garden or move the footprint of the house.
It is the first thing we measure, before anything is drawn. If the standing height is not there across enough of the floor, the answer is a dormer rather than a compromise, and that is a $25,000 to $60,000 decision. Knowing it at the start is the difference between a budget and a surprise.
Only with a way out that is not the staircase — a window large enough to climb through, or a second route. That is an inspected item, not a preference. Without it the room can be an office, a playroom or a gym, but it cannot be sold or described as a bedroom.
Often not as built. Attic framing in older Hinsdale houses is frequently sized for storage rather than for people, furniture and a bathroom. Sistering the existing joists or adding new ones is routine work and it is priced in the contract, not discovered halfway through.
Yes. The Village of Hinsdale lists remodels, renovations and alterations as permit work, and turning storage into living space involves framing, insulation, electrical and usually mechanical and plumbing changes. Height, egress and floor load are all inspected, which is exactly why the permit protects you here.
Keep Reading

More on Remodeling in Hinsdale

Home remodeling in HinsdaleThe full pictureBasement remodeling in Hinsdale$65K–$150KKitchen remodeling in Hinsdale$75K–$175KBathroom remodeling in Hinsdale$28K–$75KCustom cabinets in HinsdaleKnee-wall storage and built-insAdding a garage in HinsdaleBonus room above itWhat Hinsdale really spends643 Village permits, 2026Our portfolioProjects with prices attached
Next Step

Let's plan it

Book a free consultation at your home in Hinsdale, at the Southport studio or online, and you will have a fixed-price, line-item proposal with 3D renderings within 48 hours.

Get a free consultation →Call (312) 544-9150
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