How much does a home addition cost?

A room addition or home extension typically costs $100–$300+ per square foot depending on the type of room, finishes, foundation work, and site conditions. A basic 400 sq ft addition might run $40,000–$80,000; a master suite addition often runs $80,000–$150,000+. GS Construction provides free, detailed estimates.

How long does a room addition take?

Most room additions take 8–16 weeks depending on size, permits, weather, and structural work required. Foundation, framing, and roofing are the longest phases. Second-story additions typically take 16–24 weeks.

Do you handle architectural plans and permits for additions?

Yes. We work with licensed architects and structural engineers and handle all village/city zoning, building, electrical, plumbing, and mechanical permits — including Arlington Heights, Palatine, Hoffman Estates, and Schaumburg.

Can I add a second story to my existing house?

Often, yes. We evaluate the existing foundation and structural framing for capacity, work with an engineer to design proper reinforcement, and coordinate permits. Second-story additions are major projects but add significant square footage without losing yard space.

Will the addition match my existing home?

Absolutely. Our design team specs matching siding, brick, roofing, windows, and trim so the addition reads as part of the original home. Interior transitions are also planned to flow naturally with existing finishes.

Chicago Suburbs Home Additions — 72 Reviews

Bright four-season sunroom addition with a wall of windows, tile floor and ceiling fan — representative of the home addition projects GS Construction builds in the Chicago suburbs

Expert Home Additions Services

Expand your home with GS Construction's design-build home addition services. From single-room bump-outs and sunrooms to master suite additions and full second-story expansions, we design, permit, and build seamless additions that match your existing home's architecture inside and out.

What We Offer

Room Additions & Bump-Outs

Add square footage to family rooms, kitchens, or dining rooms.

Master Suite Additions

New primary bedrooms with walk-in closets and en-suite baths.

Sunrooms & Four-Season Rooms

Year-round living spaces with insulated walls, HVAC, and large windows.

Second-Story Additions

Full second-floor build-ups when expanding outward isn't an option.

Our Process

From initial consultation to final walkthrough, here's what to expect.

Site Assessment

We evaluate setbacks, lot size, structural capacity, and your goals.

Design & Permits

Architectural plans, engineering, and zoning/permit approvals.

Build

Foundation, framing, roofing, MEP, interior finishes — managed end-to-end.

Enjoy

Move into your seamlessly integrated, fully permitted addition.

Testimonials

Your Neighbours Love Us

Real reviews from homeowners. Ask us for live phone references.

5 Stars — HU-500566977

· Nov 2024

Read More Testimonials Show This Review →

Home Additions by City

Find local home additions contractors in your Chicago suburb.

Schaumburg Deer Park Barrington Glenview Northbrook Arlington Heights Winnetka Wilmette Kenilworth Glencoe Evanston Mount Prospect Lake Bluff Barrington Hills Buffalo Grove Chicago Countryside Deerfield Des Plaines Elgin Elk Grove Village Elmwood Park Forest Lake Forest Park Forest View Fort Hill Fox River Grove Grayslake Great Lakes Green Oaks Gurnee Harwood Heights Hawthorn Woods Highland Park Hoffman Estates Hometown Indian Creek Inverness Kildeer Lake Barrington Lake Forest Lake Villa Lake Zurich Libertyville Lincolnshire Lincolnwood Lindenhurst Long Grove Long Lake Melrose Park Morton Grove Mundelein Niles Norridge North Barrington Northfield Northlake Oak Forest Oak Lawn Oak Park Orland Hills Palatine Palos Park Park Forest Park Ridge Port Barrington Prospect Heights River Forest River Grove Riverdale Riverside Riverwoods Rolling Meadows Rosemont Schiller Park Skokie South Barrington Streamwood Vernon Hills Western Springs Wheeling Willow Springs

Ready to Add On to Your Home?

Get a free consultation and quote for your remodeling project. GS Construction is ready to bring your vision to life.

Get Free Quote View Our Work

How much does a home addition cost?: A room addition or home extension typically costs $100–$300+ per square foot depending on the type of room, finishes, foundation work, and site conditions. A basic 400 sq ft addition might run $40,000–$80,000; a master suite addition often runs $80,000–$150,000+. GS Construction provides free, detailed estimates.
How long does a room addition take?: Most room additions take 8–16 weeks depending on size, permits, weather, and structural work required. Foundation, framing, and roofing are the longest phases. Second-story additions typically take 16–24 weeks.
Do you handle architectural plans and permits for additions?: Yes. We work with licensed architects and structural engineers and handle all village/city zoning, building, electrical, plumbing, and mechanical permits — including Arlington Heights, Palatine, Hoffman Estates, and Schaumburg.
Can I add a second story to my existing house?: Often, yes. We evaluate the existing foundation and structural framing for capacity, work with an engineer to design proper reinforcement, and coordinate permits. Second-story additions are major projects but add significant square footage without losing yard space.
Will the addition match my existing home?: Absolutely. Our design team specs matching siding, brick, roofing, windows, and trim so the addition reads as part of the original home. Interior transitions are also planned to flow naturally with existing finishes.

Home Addition Contractors