Room Additions & ADU Contractor in Oak Park & River Forest
Expand Your Home With a Custom Addition Built for the Way You Live
Marion St. Services provides expert room addition and Accessory Dwelling Unit construction for homeowners in Oak Park and River Forest. From historic homes that need careful updates to growing families that need more functional space, we help plan and build additions that feel like a natural part of your home.
Marion St. Services specializes in:
- Custom Room Additions
- ADU Construction
- In-Law Suites
- Guest Houses & Backyard Living Spaces
- Family Room & Bedroom Additions
- Home Office Additions
- Garage & Carriage House Conversions
- Historic Home Renovations & Additions
- Spacious Mud Room Additions

Custom Room Additions. Built Around Your Home.
When planning your new room addition, we take your space, style, budget, and long-term needs into consideration to help create a seamless addition that fits your home and the way you live.

Room Additions
Expand your living space with a seamless room addition designed to match the character, layout, and style of your existing home.

Accessory Dwelling Units (ADUs)
We build functional ADUs, coach houses, and in-law spaces that add flexibility, privacy, and long-term value to your property.

Spacious Mudroom Additions
Create a more organized and functional entryway with a custom mud room addition designed for coats, shoes, storage, laundry, and everyday family use.
Contact Us
We respond promptly!
We respond 7 days/week to inquiries made via our contact form.
Marion Street Services
Oak Park & River Forest Area
Home Repairs & General Contracting
(312) 925-6902 Call or Text
920 Forest Avenue, Oak Park, Illinois 60302
Monday – Friday: 8am – 5pm
Saturday – Sunday: Closed

