Definition
A tenant improvement is the construction work done inside a leased commercial space to fit it to a specific tenant: new walls, finishes, lighting, and fixtures.
Tenant Improvement, Explained
When a business leases an office, store, clinic, or restaurant, the space rarely fits as-is. Tenant improvement work changes the interior to match the new tenant’s layout and brand: offices and conference rooms framed in, ceilings and lighting reworked, flooring and paint replaced, and plumbing or power added where the new use needs it.
TI work happens inside an existing building, so it runs under the landlord’s rules as well as the city’s. Building management usually approves the drawings, sets work hours, requires insurance certificates from every contractor, and controls freight elevators and loading docks.
A TI can be anything from paint and carpet in a second-generation office to a full gut of raw "cold dark shell" space where nothing exists yet but the slab and exterior walls.
Why It Matters for Your Project
Most TIs run against a fixed date: the lease commencement or the day the business needs to open. The schedule depends on how fast drawings get approved, how long materials take to arrive, and how well the contractor works within the building’s rules.
What to Watch For
- Check the work letter in your lease: it says who pays for what and who hires the contractor.
- Ask building management for their contractor rules early (work hours, COI requirements, elevator booking).
- Order long-lead items such as doors, hardware, glass, and specialty lighting as soon as drawings are final.
- Confirm whether the space is first-generation (raw) or second-generation (previously built out); it changes cost a lot.