Tenant improvements and commercial buildouts have a narrower compliance scope than ground-up construction, but that narrower scope creates its own set of questions — what actually needs to be evaluated when a space is being finished out inside an existing shell, and how compliance documentation should reflect a project that touches lighting and interior systems but not the building envelope.
A tenant improvement generally doesn't involve changes to the building's exterior envelope — walls, roof, and windows are typically part of the base building and outside the tenant's scope of work. This means COMcheck compliance for a TI project is usually focused on lighting and, in some cases, mechanical systems specific to the tenant space, rather than the full envelope evaluation required for new construction.
Lighting is typically the primary compliance concern for a tenant improvement, since the tenant space's interior lighting design — fixture selection, layout, and controls — is squarely within the buildout scope. The applicable lighting power density allowance depends on the specific space-use classification of the tenant space (retail, office, restaurant, and so on), which needs to be identified accurately rather than assumed from the building's general use.
Where a tenant improvement includes new or modified HVAC equipment serving the tenant space, mechanical efficiency requirements may apply even though the envelope itself isn't being altered. This is a common point of confusion — contractors sometimes assume that because there's no envelope work, no COMcheck documentation is needed at all, when in fact the lighting and mechanical components may still require it.
Some tenant improvements do involve envelope changes — a new storefront system, modified window openings, or an added exterior door — and where this occurs, the affected envelope components need their own compliance documentation, scoped to what's actually being changed rather than the whole building.
Because a tenant improvement operates within an already-permitted base building, it's worth confirming what compliance documentation exists for the shell itself, particularly for older buildings where original construction may have been permitted under a different code cycle. This context isn't usually required as part of the TI's own COMcheck submittal, but it helps clarify what's genuinely within the tenant scope versus what's a pre-existing condition of the building.
Does a tenant improvement always require a COMcheck submittal?
In most jurisdictions, yes — even without envelope changes, lighting (and sometimes mechanical) compliance typically still needs to be documented for the tenant space.
How is the correct lighting power density allowance determined for a tenant space?
It's based on the specific space-use classification of that tenant space, not the building's overall use — a restaurant tenant in an office building, for example, follows restaurant lighting allowances for its own square footage.
What if the tenant improvement doesn't include any new lighting or mechanical work?
If existing lighting and mechanical systems aren't being modified, the compliance documentation burden is typically minimal, but this should be confirmed with the local jurisdiction rather than assumed.
Psychro.Pro prepares COMcheck reports scoped correctly for tenant improvements and buildouts, focused on the lighting and mechanical work actually within your project's scope.Learn more.
