Tenant improvement construction estimating
Tenant Improvement Construction Estimating in New York
Tenant improvement construction estimating in New York starts not from a blank floor plate but from an existing condition: an as-built space with existing MEP systems, a previous tenant's finishes, and a lease that defines what the landlord will deliver and what the tenant must build. The estimate must account for the actual starting condition—not an assumed clean shell—the instructed demolition scope, the retention or modification of existing systems, and the new construction required to bring the space to the tenant's specifications. Getting this right prevents cost surprises and scope gaps from emerging during construction.
THE SHORT ANSWER
What does tenant improvement construction estimating include?
TI estimating covers the full scope from demolition through new construction within the leased premises. This includes selective demolition of existing conditions, protection of retained systems, patching and preparation, and all new architectural and MEP work in the tenant's scope. The estimate identifies what the landlord provides, what the tenant builds, and what is retained from the existing condition. Owner-supplied equipment and furniture are excluded from the construction cost.
Review the scope and deliverablesStart with the existing condition, not a blank floor plate
A tenant improvement in an existing New York commercial building begins with what is already there. Request as-built drawings of the existing space, or confirm that an as-built survey has been performed, before the estimate is structured. A survey should document existing partition locations, ceiling heights, MEP distribution, electrical panel capacity, and the condition of existing finishes.
Where as-built drawings are not available, the construction documents must include sufficient existing condition information for the estimate to be based on documented scope rather than assumptions. Note any areas where the existing condition is uncertain—concealed MEP above existing ceilings, existing structural conditions behind walls—as scope assumptions in the estimate.
Identify which existing systems will be retained, modified, or demolished. Existing HVAC equipment that will be retained but reconnected in a new configuration requires connection and testing scope. Existing electrical panels that will be retained but re-circuited require scope for the new branch circuits and device installations. Do not exclude these items from the estimate simply because the equipment is not new.
Define the demolition scope from the construction documents
Demolition estimating for TI work covers selective removal of partitions, ceilings, flooring, millwork, MEP distribution, and finishes to the extent shown in the demolition drawings. Identify what is removed versus what is retained versus what is patched. Demolition quantities should come from the demolition plans, not from an assumed percentage of new construction.
Hazardous material—asbestos-containing floor tiles, pipe insulation, or ceiling tiles—may be present in older New York commercial buildings. If environmental testing is not yet complete, note the risk of hazardous material as an assumption in the estimate. Hazardous material abatement is typically a separate subcontract with specific regulatory requirements and should not be embedded in general demolition costs.
Patch and repair work—closing openings left by demolished partitions, repairing slab penetrations, filling demolished duct penetrations in rated walls—is demolition-related scope that often gets missed. Identify each patch condition from the demolition and new construction drawings and price the work as line items in the demolition or rough carpentry section.
Confirm the landlord-tenant work split before pricing
The lease work letter defines what the landlord will deliver and what the tenant must build. In New York, landlord-delivered conditions vary widely: one landlord delivers a raw shell; another delivers a warm shell with ceiling grid, HVAC distribution, and base electrical to the space; a third delivers a standard build-out that the tenant customizes. The estimate must reflect the actual delivery condition, not an assumed one.
Where the landlord provides a tenant improvement allowance rather than performing construction directly, the tenant's estimate covers the full construction cost and the allowance appears as an owner's credit against the construction cost. Identify whether the TI allowance covers hard costs only, soft costs, or a combination, and structure the estimate accordingly.
Confirm which existing systems the landlord is responsible for maintaining or replacing. If the base-building HVAC system is at the end of its useful life and the landlord has not committed to replacing it, that uncertainty should be noted in the estimate. A system that cannot be reused may require full replacement as tenant scope, not an assumed modification.
QUESTIONS ABOUT TENANT IMPROVEMENT CONSTRUCTION ESTIMATING
Before you define the assignment
01How are existing conditions handled when as-built drawings are not available?
Where as-built drawings are not available, the estimate is based on the information in the construction documents supplemented by site visit observations. Areas where the existing condition is uncertain are noted as assumptions in the estimate. The project team should confirm that the construction documents reflect the actual condition before the estimate is finalized.
02How are retained systems handled in the TI estimate?
Retained systems are excluded from the equipment or material supply cost but included for any connection, testing, modification, or integration work they require. Existing MEP distribution that will be reused but reconfigured is included in the estimate for the reconfiguration scope.
03How does a TI allowance affect the estimate?
A TI allowance is an owner's credit applied against the construction cost. The estimate is prepared for the full construction scope. The TI allowance is then shown as a credit to determine the net tenant construction cost. If the allowance covers soft costs, those items should be excluded from the hard cost estimate.
04How is hazardous material handled in the TI estimate?
If environmental testing is complete, hazardous material abatement is included as a separate line item based on the abatement contractor's scope. If testing is not complete, the risk of hazardous material is noted as an assumption in the estimate, with a cost range or allowance provided based on the likelihood of encountering it.
Have a scope question before sending files?
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Start from the existing condition, not a blank floor plate.
Send the demolition and construction drawings, the lease work letter, and any as-built information.