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Mission Statement

Our mission at Key Interiors is to deliver the highest quality designed and executed renovation project for your firm, a workplace designed to motivate your employees and inspire prosperous client relationships. Let us be the key to your interior project.​

What We Do

Key Interiors has developed a unique system for providing clients a total office fitout.

We work closely together, from the initial design concepts right through to project completion. This provides you with a level of fiscal control and project time management that is not possible without this turn-key system.

Why Key Interiors?

Key Interiors is unique in the commercial interiors industry. By working with our clients from concept to completion, we are very aware of the client’s budget needs. Time is saved by not pricing concepts that are out of bounds financially. Although each project has its possibilities and challenges, our processes can adapt quickly so that together we can deliver a successful result on time and within budget. We eliminate the headache of dealing with multiple different trades by simply doing that part for you. Essentially, Key Interiors is your one-stop-shop for the entire project!

  • Cost savings as a result of design knowledge and value engineering processes
  • Key Interiors holds a current City of Chicago General Contractors License #TGC033239
  • Experience with the Building Permit process and working with City Inspectors
  • A full team of Contractors available for immediate mobilization
  • Project Integration Management (PIM) system in place for key management personnel to quickly plan and manage the project.


Robert Johnstone establishes an architectural office in Oak Park, IL after graduating from IIT.
Robert works for the City of Chicago's Architectural Office on the continuous expansion of O'Hare airport. In 1978, Jim Johnstone, Robert's son, joins together with his father in a construction business focusing on renovations of historic homes in the Frankn Lloyd Wright districts of Oak Park and River Forest, along with the Oak Brook and Hindsdale communities.
Johnstone Contracting begins fabricating its own millwork in a rented facility in Oak Park. In 1985, Johnstone Contracting purchases its own building for a showroom and a fabricating facility.
Key Interiors begins working on specialized medical office interiors and purchases a larger facility in Franklin Park enabling it to expand its market reach into other areas of commercial work. Jim's sons begin to join the company as third generation owners.
Late in the decade, the Global Financial Crises hits the economy. Key Interiors reacts by finding new suppliers with products of exceptional value so that their clients keep moving forward in difficult times.
Key interiors positions itself as an innovator in the design, build and furnish industry. By coordinating all facets of a project, we develop a unique niche in the commercial construction market.
Key Interiors invests capital back into the business and renovates their Chicago headquarters to expand their design studio and prepare for future growth. A second location is opened in Central OH to expand the business's footprint in the greater Midwest.

Environmental Policy

We have great respect for the environment. In our own business processes, and those of our suppliers we are concerned to act responsibly and with a sense of duty towards the rights of others.

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Corporate Showroom      1072 N. Garfield St.
Lombard, IL 60148

Ohio Showroom                      81 Mill Street
Gahanna, OH 43230


Illinois: 877.288.9919

Ohio: 866.755.9230