Commercial Build-Out Timeline: From Shell Space to Opening Day

One of the most common mistakes commercial tenants make in Chicago is underestimating how long a build-out takes. A business owner signs a lease expecting to open in 8 weeks, then discovers that permits alone take 6 weeks — and suddenly they're paying rent on a dark space with no opening date in sight.

This guide gives you a realistic commercial build-out timeline for Chicago so you can plan your lease start date, your financing, your hiring, and your marketing around what construction actually takes — not what you wish it took.

The Short Answer

A realistic commercial build-out timeline in Chicago from lease signing to opening day runs:

Simple cosmetic renovation of an existing build-out: 4 to 8 weeks
Mid-level office or retail build-out from vanilla box: 10 to 16 weeks
Full build-out from shell condition: 16 to 24 weeks
Restaurant build-out from shell: 20 to 36 weeks
Medical office build-out: 16 to 28 weeks

Every project is different. These ranges assume no major surprises, a contractor engaged early, and a permit process that moves normally. Delays at any stage — design, permitting, material delivery, inspections — push the timeline out.

Phase 1 — Design and Drawings (2 to 8 weeks)

Before a permit can be pulled in Chicago, you need construction drawings. For a simple scope like painting, flooring, and minor partitions, you may be able to work from basic plans. For anything involving structural changes, new plumbing, HVAC modifications, or electrical panel upgrades, you need a licensed architect or engineer to prepare permitted drawings.

The design phase takes 2 to 4 weeks for a straightforward scope and 4 to 8 weeks for a complex one. If your architect is backed up, add time. If you're making frequent changes to the design, add time.

What slows this phase down:

Indecision on layout or finishes
Multiple revision rounds
Landlord approval requirements
Architect availability

What speeds it up:

Having a clear vision and a defined scope before you engage the architect
Using an architect who specializes in commercial TI work and knows Chicago building department requirements

Phase 2 — Permitting (2 to 8 weeks)

Chicago's Department of Buildings reviews permit applications for commercial construction projects. The timeline depends on the complexity of the scope and the current workload of the plan review department.

Express permit: Available for simple scopes that meet specific criteria. Typically processed in 5 to 10 business days. Not available for complex scopes, structural work, or projects above certain thresholds.

Standard permit: For most full build-outs, plan review takes 4 to 8 weeks. Some projects go faster; some take longer depending on comments from plan review that require revisions and resubmittal.

What slows permitting down:

Incomplete or incorrect drawings
Missing required documentation
Plan review comments requiring significant revisions
Specialty permits required (fire suppression, elevator, health department for restaurants)

What speeds it up:

Experienced architect who knows Chicago submittal requirements
Complete and correct first submission
Using the City's electronic permit system correctly

A contractor cannot legally begin most permitted construction work until the permit is issued and posted at the job site. Anyone who tells you they can start framing while your permit is under review is asking you to take on significant liability.

Phase 3 — Construction (4 to 16 weeks depending on scope)

Once the permit is in hand, construction begins. A well-organized commercial build-out follows a rough sequence:

Week 1 to 2: Demolition of existing conditions, rough framing of new partitions

Week 2 to 4: Rough mechanical, electrical, and plumbing — everything that runs inside walls and above ceilings before they close up

Week 3 to 5: Rough inspections — the city inspector must approve rough electrical, plumbing, and framing before walls can close. Schedule these early; inspection availability in Chicago varies.

Week 4 to 8: Drywall installation, taping, finishing

Week 6 to 10: Ceiling installation, painting, flooring

Week 8 to 12: Millwork, doors and hardware, fixtures, equipment installation

Week 10 to 14: Final finishes, punch list, final inspections

Week 12 to 16: Certificate of Occupancy issued, space turned over

These phases overlap in a well-run project. Painting starts while flooring materials are being delivered. Millwork is fabricated off-site while framing is happening. A good project manager keeps the trades sequenced so nothing is waiting on something else unnecessarily.

Phase 4 — Inspections and Certificate of Occupancy

Chicago requires inspections at multiple stages of construction and a final Certificate of Occupancy (CO) before a business can legally open to the public. You cannot open without the CO.

Final inspections cover building, electrical, plumbing, and any specialty systems. If an inspection fails — even on a minor item — it has to be corrected and re-inspected before the CO is issued. Budget time for this. Even well-run projects sometimes have minor inspection corrections.

In Chicago, the CO process typically adds 1 to 3 weeks to the end of a project. Plan for it, don't be surprised by it.

The Real Timeline by Project Type

Simple Office or Retail Renovation

Design: 1 to 2 weeks
Permit: Express permit, 1 to 2 weeks
Construction: 3 to 6 weeks
Total: 5 to 10 weeks

Full Office Build-Out from Vanilla Box

Design: 3 to 5 weeks
Permit: 4 to 6 weeks
Construction: 6 to 10 weeks
Inspections/CO: 1 to 2 weeks
Total: 14 to 23 weeks

Retail Build-Out from Vanilla Box

Design: 3 to 6 weeks
Permit: 4 to 6 weeks
Construction: 6 to 12 weeks
Inspections/CO: 1 to 2 weeks
Total: 14 to 26 weeks

Restaurant Build-Out from Shell

Design: 6 to 10 weeks
Health department pre-approval: 4 to 8 weeks (runs parallel)
Permit: 6 to 10 weeks
Construction: 10 to 16 weeks
Inspections/CO/Health inspection: 2 to 4 weeks
Total: 24 to 48 weeks

Medical Office Build-Out

Design: 4 to 8 weeks
Permit: 5 to 8 weeks
Construction: 8 to 14 weeks
Inspections/CO: 2 to 3 weeks
Total: 19 to 33 weeks

What You Can Do to Protect Your Timeline

Hire a contractor before you finalize your lease. Get a contractor involved during lease negotiations so you have a realistic schedule in hand before you commit to a rent start date. Most commercial landlords will negotiate a rent abatement period — often called a "free rent period" or "build-out period" — but you need real numbers to negotiate from.
Don't sign a lease with an opening date you can't hit. This is the most common and most expensive mistake. A restaurant operator who signs a lease with a 90-day build-out period and then discovers the actual timeline is 9 months is paying rent with no revenue for 6 months.
Engage your architect early. Design delays push everything. The permit clock doesn't start until drawings are submitted. Every week lost in design is a week added to your opening date.
Plan for surprises. Hidden conditions inside walls, asbestos in old tile or ceiling material, plumbing that doesn't match the drawings — these happen in Chicago's older commercial building stock. A 10 to 15 percent contingency in your schedule and budget is not paranoia, it's planning.
Chicago Construction Crew works with business owners, brokers, property managers, and developers throughout the Chicago metro. We engage early in the process — during lease negotiation if needed — to give you a realistic timeline and budget before you commit.

Planning a commercial build-out in Chicago? Request a commercial bid or call George directly at 773-934-1500. We help you plan it right from the start.