#1 Chicago General Contracting Contractor: Pegasus Construction
Finding the right contractor to build an addition on your Des Plaines home can be a challenge. It’s important to thoroughly vet and interview your options before deciding who to hire.
To ensure that you find a contractor that meets your needs and budget expectations, download our free 3-Step Guide to Choosing A Remodeling Contractor.
Whether you decide to hire our team at Pegasus Construction or another local remodeler, you can use this helpful guide to be confident knowing you have your bases covered.
A successful home remodel starts with a clear plan. With hundreds of satisfied Des Plaines customers, our proven 6-Step Design-Build Process ensures a smooth and stress-free remodeling experience.
1 in 3 remodels exceed their budget—but yours doesn’t have to. At Pegasus Construction, we’ve created a budgeting system to eliminate surprise costs, with our projects averaging just a 5% variance from the initial budget to the final price.
Feel confident knowing your home remodel is managed by experts. Each project is assigned a dedicated team, led by an experienced master carpenter, ensuring timely completion. While other companies face delays of weeks or months, our projects average less than a 2-day difference from the original schedule.
Des Plaines is a post-war suburb of 1950s–70s ranches and split-levels on standard city lots near O’Hare. Many have outgrown their original footprint, and adding on means working within city setbacks and the existing structure.
If you find yourself needing more living space and want to expand your home rather than upsize, a single-level addition is the place to start.
The most cost-effective way to add living space, a single-level addition attaches to the side of the home. They typically require expanding the home’s foundation, and are most often used for expanding kitchens, living rooms, or home offices.
Single-level additions are typically limited by lot size and setback laws. For this reason, these additions are better fit for homes on larger lots.


Want to expand your home without expanding its footprint? Many homeowners don’t realize it’s possible to expand their living space by adding a second story.
Although often more expensive than single-level additions, second-story additions can be a great solution for homeowners who need additional living space but don’t have enough yard space to build out.
Second-story additions tend to be more technically challenging, as they require extensive engineering and planning to ensure that they don’t disrupt the design or aesthetic of the existing structure.
For some homeowners, a basement addition is the best way to expand their living space. This often involves either raising the home or digging out the crawl space.
Homeowners who go this route often use their basement for additional bedrooms, a recreational space, or an Accessory Dwelling Unit (ADU).
Basement additions are among the most expensive methods of adding onto a home. Extensive manual labor, planning, and permitting all contribute to the high cost of basement additions.

At Pegasus Construction our mission is to change the lives of homeowners by helping them expand their homes with custom home additions built just for them. However, we also recognize that not every home addition project is the right fit for our team. Here is how to tell if Pegasus Construction is or isn’t a good fit for your home addition project.
Schedule an advisory call with a Design Consultant
Invite us to your home for an initial evaluation
Align on a budget and meet to discuss the design
Hear that this client had to say!
“…I felt truly heard and valued during our conversation. I came to your company with questions about our projects, and Greg provided thoughtful, flexible scenarios and options to help us achieve our goals. He genuinely seemed to care about me and my family as real people.”
Common Des Plaines additions are family-room and kitchen expansions, primary-suite additions, and second-story or dormer additions on ranches and split-levels that have outgrown their footprint. We look at your lot and the existing structure to decide whether building out or up makes more sense.
Yes, and additions get more review than an interior remodel. Any addition needs a permit and zoning review from the City of Des Plaines Building Division at 1420 Miner Street, covering setbacks and lot coverage. We handle the drawings, submission, and inspections.
Des Plaines enforces side-, front-, and rear-yard setbacks plus lot-coverage limits on standard city lots. Before we design anything we pull your lot’s zoning so the addition is something the City will actually approve.
Often yes — adding up is a common way to gain bedrooms without giving up yard. The key is whether the existing foundation and framing can carry the load, so we evaluate the structure before promising a second story and reinforce it where needed.
It can — Des Plaines has real stormwater and Des Plaines River flood concerns, and an addition changes how water moves around your home. The City reviews grading and drainage, and we plan the site work so your new space doesn’t create or worsen a water problem.
Des Plaines additions vary widely — a room addition might start around $70,000, while a large primary-suite or full second-story addition can run $180,000 or more. We give you a fixed, itemized number once the design is set.
Plan on roughly 4 to 7 months from design to finish, including zoning and permit review through the City of Des Plaines. We give you a real schedule up front, not an optimistic guess.
That’s the goal. Des Plaines is full of mid-century ranches and split-levels with a specific low, horizontal look, and a good addition should match the rooflines, brick, and proportions so it reads like original construction.
Choosing the right contractor for your remodel can be simple. Use our free guide to walk you through 3 easy steps to select the perfect contractor.