Why office fit out projects go over budget
Budget overruns on office fit outs rarely come from a single dramatic event. More often they accumulate: a scope gap at tender, a late design change after services are in, a building condition that was not visible on a drawing. The good news is that most patterns are predictable — and manageable if you name them early.
Here is a straight account of why spend drifts, what it looks like in practice, and the habits that keep projects financially honest.
Scope that was never pinned down tightly enough
If the tender package assumed a level of finish, M&E capacity, furniture scope, or landlord approvals that the evolving brief contradicts, costs will move. “We assumed standard vinyl” is a different job from “we need stone and bespoke joinery in client areas.”
Protection is explicit inclusions and exclusions, a signed-off room data sheet approach for key spaces, and change control once site work starts — so every decision has a visible price before you approve it.
Change after work is fixed in place
Moving a wall on paper is cheap. Moving it after containment and first fix are in is not. Late changes are the fastest way to burn contingency — not because contractors inflate them, but because rework is genuinely expensive and sequential.
Strong design development, early coordination between architecture and M&E, and freezing layout milestones reduce churn.
Building conditions and discovery
Older stock can hide failed screeds, asbestos in unexpected locations, inadequate power headroom, or water ingress. Surveys reduce risk; they do not remove it entirely. A sensible contingency for discovery is part of a mature budget — not an admission of failure.
Specification creep and parallel decisions
Small upgrades add up: better acoustic glass, upgraded door sets, enhanced AV in every meeting room. Individually they look minor; together they change the job. A single accountable client-side approver and a running cost log stop “while we are at it” from becoming a programme of its own.
Programme pressure and procurement lag
Long-lead items ordered late drive express costs or delay. Acceleration to recover time can mean overtime and parallel trades. The antidote is procurement tracked against the critical path — not against hope.
Keeping the budget conversation useful
Transparent reporting, clear change orders, and realistic contingency make overruns less likely — and easier to manage when they happen. If you are benchmarking cost before you have a locked brief, use a structured model and then validate with a team that has delivered comparable office fit outs.
