A document review checklist built for ground-up new construction checks whether the drawings agree with each other. A tenant improvement or interior fit-out checklist has to check something else first: whether the drawings agree with a building the owner doesn't own, whose actual condition above the ceiling and behind the walls was shaped by every tenant who occupied the space before this one. That's a different exposure than a coordination conflict between two disciplines on a clean sheet, and it's the exposure a checklist copied from a ground-up review won't catch.
The scope line makes it harder, not easier. A tenant improvement set is drawn against a landlord's base building — its structure, its shafts, its rooftop mechanical plant — that the design team doesn't control and frequently can't fully verify before permit submission. Add a lease-driven schedule with a fixed commencement date, and a TI or fit-out set carries three layers of risk a ground-up review doesn't: whether the base building documents the design was drawn against are still accurate, whether the landlord/tenant scope split is actually where the lease says it is, and whether there's enough schedule left to fix what the review finds before the date on the lease arrives regardless.
Why a Tenant Improvement Set Needs Its Own Checklist
A standard document review checklist checks drawing-to-spec agreement and discipline-to-discipline coordination — the same baseline that applies to a document review checklist for renovation and adaptive reuse projects, where the design also has to agree with an existing structure rather than a clean site. A tenant improvement project inherits that same existing-conditions problem, but adds a layer renovation work on an owner's own building doesn't have: the "existing conditions" documentation wasn't produced by anyone on the current project team, and it's frequently a landlord-supplied record drawing that reflects the building as originally constructed rather than as it exists after however many tenants have modified the ceiling, the electrical panels, and the mechanical distribution since.
Base building drawings provided for a TI design typically show the building as it was originally built or last formally updated — not as it exists after prior tenants rerouted ductwork, added piping, or relocated electrical panels without feeding those changes back into the landlord's record set. A design team coordinating against that record set is coordinating against a building that may no longer exist in the form shown.
Base Building vs. Tenant Scope: The Line a Checklist Has to Confirm First
Every TI project runs on a scope split defined in the lease's work letter — which improvements the landlord delivers as base building, and which the tenant's contractor builds as tenant work. That split is a legal boundary before it's a construction one, and a document review has to confirm the drawings actually respect it, not just that they're internally coordinated.
- Base building document source and currency. Confirm whether the architectural, structural, MEP, fire protection, and life-safety drawings the design team worked from were field-verified for this project or simply pulled from the landlord's file — and whether any as-built documentation reflects changes made during prior tenants' build-outs.
- Scope split against the lease exhibit. Verify the drawings match what the work letter actually assigns to each party. Electrical panel and service upgrades are a frequent point of dispute in scope-split language — confirm whether the panel capacity the TI design assumes is base building's responsibility to provide or the tenant's to fund, and that the drawings reflect whichever the lease actually says.
- Permit responsibility. Some leases assign permit pull responsibility to the tenant's contractor, others keep it with the landlord — confirm the set is stamped and packaged for whichever party the lease designates, since a mismatch here stalls a permit submission on a schedule with no slack for it.
Above-Ceiling Coordination: Where TI Sets Fail Most Often
Ceiling space is the most contested real estate on almost any interior fit-out, and it's contested for a structural reason: most commercial buildings run 8- to 9-foot finished ceilings, which leaves a shallow plenum where HVAC ductwork, piping, conduit, cable tray, and sprinkler lines are all competing for the same few inches. That congestion problem exists on ground-up construction too, but a TI project adds prior-tenant history on top of it — mechanical, electrical, and plumbing subs need to see the actual field condition above the ceiling before final layout, not just what the base building drawings claim is there, because a previous build-out may have already used up clearance the current design is counting on.
That same structural-vs-MEP interface fight shows up on every project type, but on a TI project it's compressed into a single ceiling plane with less usable depth and a design team that can't always get above the existing ceiling to verify conditions before the drawings are finalized. A document review scoped for a TI set should flag any above-ceiling layout that was never field-verified against current conditions as an open item, not an assumed pass.
Code Triggers That Apply Differently to Leased, Occupied Space
A tenant improvement project is, by code definition, an alteration to an existing building — which routes it through the International Existing Building Code's alteration-level framework rather than a ground-up review. The set needs to state which alteration level applies, because each level triggers a different scope of required upgrades:
- Level 1 — work that doesn't reconfigure space or change occupant load; only the altered elements themselves need to meet current code.
- Level 2 — work that reconfigures space, changes occupant load, or replaces building systems; this level pulls in egress, accessibility, and adjacent-corridor upgrades within the scope of work.
- Level 3 — work affecting more than 50% of the building's aggregate area, which carries the most extensive upgrade requirements of the three.
A checklist that doesn't confirm which level the design team used — and whether the drawn scope actually matches that level's requirements — leaves the same kind of gap a missed code trigger creates on any existing-building project.
Accessibility upgrades follow their own separate trigger. Under the ADA, an alteration to a "primary function area" requires the accessible path of travel serving it — including restrooms, drinking fountains, and public telephones along that path — to be brought into compliance, up to a cost cap of 20% of the total alteration cost. A tenant-only alteration inside space only that tenant occupies does not, on its own, obligate the landlord to upgrade areas under the landlord's control that aren't otherwise being altered — a distinction worth confirming explicitly, since it determines whether path-of-travel scope belongs on the tenant's side of the line or stays out of this project entirely.
The Schedule Problem a Ground-Up Review Doesn't Have
A lease commencement date doesn't move because a document review found a coordination conflict. TI and fit-out projects routinely run on compressed, lease-driven schedules with less RFI-cycle slack than a ground-up project of comparable size, which makes the timing of the review — not just its content — part of what a TI-specific checklist has to account for. A review that surfaces a base-building discrepancy or a scope-split gap after permit submission costs schedule that a lease deadline usually can't absorb; the same finding caught before submission is a redline. That's the practical argument for running the document review early enough in design development to catch base-building and scope-split issues while there's still time to resolve them on paper, rather than waiting for a bid-ready set the way a ground-up checklist for a set ready for bid typically assumes.
Key takeaways
- A TI or fit-out set has to be checked against a landlord-controlled base building, not just against itself — and the base building drawings provided often don't reflect what prior tenants actually did to the space.
- Confirm the drawn scope matches the lease's work letter, especially at electrical panel and service upgrades, which are a common point of landlord/tenant scope dispute.
- Above-ceiling coordination carries extra risk on TI projects: narrow plenum depth in an 8'–9' ceiling building, plus undocumented modifications from prior build-outs the current design may not have field-verified against.
- Confirm the IEBC alteration level (1, 2, or 3) the design team used, and separately confirm the ADA path-of-travel scope and 20% cost-cap calculation, including whether a tenant-only carve-out applies.
- Run the review early enough in design development to fix base-building and scope-split gaps on paper — a lease commencement date won't move to accommodate a conflict caught at permit submission.
Frequently Asked Questions
How is a tenant improvement document review checklist different from a standard one?
A standard checklist verifies that the drawings are internally coordinated. A TI-specific checklist adds two layers a ground-up review doesn't need: confirming the design is coordinated against the landlord's base building as it actually exists (not just as originally recorded), and confirming the drawn scope matches the landlord/tenant split defined in the lease's work letter.
Why is above-ceiling coordination a bigger risk on TI projects than on new construction?
Most commercial buildings have a shallow ceiling plenum — commonly 8 to 9 feet of finished ceiling height — where ductwork, piping, conduit, cable tray, and sprinkler lines already compete for limited space. On a TI project, that congestion is compounded by whatever prior tenants did to the same ceiling space, often without updating the landlord's base building drawings, so the current design may be coordinating against a plenum condition that no longer matches what's shown.
What is the IEBC alteration level, and why does it matter for a TI set?
The International Existing Building Code sorts alteration work into three levels. Level 1 only requires the altered elements to meet current code; Level 2 (space reconfiguration, occupant load changes, or system replacement) pulls in egress and accessibility upgrades within the scope of work; Level 3 (over 50% of the building's aggregate area) carries the most extensive requirements. A document review needs to confirm which level applies and that the drawn scope actually satisfies it.
Does an ADA path-of-travel upgrade always apply to a tenant improvement?
Not automatically. An alteration to a primary function area generally requires the accessible path of travel to that area to be upgraded, capped at 20% of the alteration's cost — but a tenant-only alteration inside space that only the tenant occupies doesn't by itself obligate the landlord to upgrade areas under the landlord's separate control. A document review should confirm which side of that line the project falls on before assuming path-of-travel scope is or isn't included.
Why does the timing of a document review matter more on a TI project?
Because the schedule usually doesn't have the slack a ground-up project might. TI and fit-out projects are commonly built against a fixed lease commencement date, which means an RFI or change order discovered late in construction threatens a date that can't simply move. Running the review earlier in design development — while base-building and scope-split issues can still be resolved on paper — protects schedule in a way that reviewing a bid-ready set alone doesn't.