BUA (Built-Up Area)
Built-Up Area (BUA) refers to the total floor area of a unit including the thickness of outer walls and any common wall shared with adjacent units, but excluding common areas like lobbies, staircases, and lift shafts. It sits between carpet area (the usable internal floor space) and super built-up area (which includes a share of all common areas).
In Indian commercial leasing, rents are typically quoted on a super built-up area basis, but occupancy planning is done on carpet area. The loading factor. The ratio of super BUA to carpet area. Commonly runs 25–40% in Grade A office buildings. Knowing the BUA helps you cross-check whether a landlord's loading factor is reasonable. Always ask for all three figures before signing a lease.
Related terms
Learn more
Understanding Office Fit-Out Costs and Budget Benchmarks in Western India
How BUA (Built-Up Area) fits into an office project
BUA (Built-Up Area) matters when a workplace moves from a broad design idea to a coordinated brief. The team should define what the term means for this project, where it appears in the drawings or specifications, and who approves it. That prevents a familiar word from hiding a gap in scope, procurement, installation, or handover.
Questions to settle early
- What outcome should BUA (Built-Up Area) support for the people using the workplace?
- Which drawings, schedules, samples, or calculations will confirm the requirement?
- What needs to be coordinated with architecture, interiors, MEP, technology, or building management?
What to record in the project brief
Record the selected approach, responsible owner, approval point, relevant exclusions, and the evidence required at installation or handover. If the requirement affects cost, lead time, maintenance, safety, comfort, or future flexibility, state that connection plainly. The definition is a starting point. The project brief turns it into a checkable decision.
A practical checklist for BUA (Built-Up Area)
When BUA (Built-Up Area) appears in a workplace brief, avoid treating it as a standalone line item. Connect the requirement to the people, spaces, services, and operating routines it is meant to support. A short definition is useful for orientation. A good brief also explains the project context, the expected performance, and the evidence needed before approval.
Before design sign-off
Confirm the existing site condition and any landlord or building-management rules that affect the decision. Mark the requirement on the relevant plans and schedules. Check interfaces with adjacent trades, access for installation, maintenance access, replacement cycles, and the effect on the programme. If alternatives are possible, compare them on whole-life suitability rather than headline purchase price alone.
At procurement and handover
Keep the approved specification, supplier information, samples or calculations, and agreed exclusions together with the project record. At handover, verify that the installed result matches the approved design and that the client receives the information needed to operate and maintain it. This makes BUA (Built-Up Area) a useful control in delivery, not just a glossary phrase.
For a project-specific discussion, start with the Vektor Spaces services, review the delivery process, and bring the relevant questions to a project enquiry.
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