Tenant improvement estimating documents the scope of a commercial space buildout or renovation, separating landlord work, tenant work, and owner-furnished items. Existing conditions, selective demolition, retained systems, and phased delivery all create scope questions that must be resolved before quantities can be confidently measured.
Draw the scope boundary before measuring anything
Define landlord work, tenant work, and owner-purchased equipment at the start. A common area of ambiguity is HVAC: does the landlord's base building system include distribution to the space, or only a connection point at the mechanical room? Restrooms, entry doors, electrical service capacity, and structural loads are other frequent boundary questions.
Get the landlord's work letter and the tenant's design criteria before pricing. A scope based on assumptions about what the base building includes may miss significant cost or duplicate work already covered.
Existing conditions drive the first estimate risk
A tenant improvement estimate for an existing space needs as-built or existing-condition information. Review available drawings, photographs, and inspection observations. Note what has not been verified.
For occupied buildings, confirm access arrangements for site investigation. Concealed conditions — above-ceiling system routing, structural capacity, plumbing configuration, and electrical capacity — may require investigation before the design is complete. Allow for that uncertainty explicitly rather than assuming the existing conditions match available records.
Selective demolition requires its own takeoff
Remove, retain, and reuse decisions should be documented in the selective demolition scope. Identify which existing partitions, ceilings, flooring, and systems are to be removed, which are retained, and which could be reused if found to be in acceptable condition.
For occupied buildings, demolition sequencing, temporary protection, dust control, vibration, and noise management add scope and cost that are easy to miss in a simple square-foot calculation. Confirm access hours and any operational restrictions.
Arizona tenant improvement context
The Phoenix metro has an active commercial tenant improvement market across office, retail, restaurant, medical, and industrial uses. Tempe, Scottsdale, and the Chandler/Gilbert East Valley have active office and medical TI markets. Phoenix and Glendale have active retail and restaurant activity.
For each use type, the finish and system requirements differ significantly. A medical office TI has different plumbing, electrical, accessibility, and infection-control requirements than a standard office suite. A restaurant TI adds commercial kitchen ventilation, grease waste, walk-in refrigeration, and health department coordination. Confirm the intended use and the applicable occupancy before pricing.
Example: a Tempe office tenant improvement
A hypothetical Tempe office TI covers 8,000 square feet of existing open office space being converted to a mix of private offices, a conference room, and a collaboration area. The estimate separates selective demolition, new partitions and doors, ceiling modifications, lighting changes, HVAC distribution modifications, electrical device changes, flooring, and painting.
The landlord has confirmed existing HVAC capacity is adequate; distribution is the tenant's responsibility. The existing ceiling grid will be reused where unaffected; a material allowance covers grid matching and replacement tiles. These assumptions are documented rather than buried in unit rates.
Questions, clarified.
Who pays for code upgrades in a TI?
Code upgrades triggered by the proposed work are typically the tenant's responsibility; upgrades to bring the base building to current code may be the landlord's. Review the lease and applicable jurisdiction guidance. Do not assume either party is responsible without confirming.
Should the TI estimate include permitting fees?
Permit fees may be a tenant cost, a landlord cost, or a draw from the tenant improvement allowance. Confirm with the lease and the project team. Identify whether they appear in the construction estimate or are treated as soft costs.
How are retained systems priced?
Identify which systems are retained, which are modified, and which are replaced. Retained systems reduce material cost but may add inspection, testing, or patching scope. Do not omit those activities from the estimate simply because no new equipment is being installed.
Can a TI estimate be completed before the design is finalized?
A preliminary estimate based on the space program and design criteria supports lease negotiation and budget planning. It should have visible assumptions and clear uncertainty. A detailed estimate requires coordinated construction documents.