How Often Should You Re-Survey a Building?

By Salar Kiabi, Founder, FIMIT · 7 July 2026 · 5 min read

Last reviewed 17 July 2026

The traditional answer to "how often should we re-survey?" was "as rarely as possible", because a measured survey was slow and costly. That framing is backwards. You should update a building record whenever the building changes — and the reason teams did not is simply that re-surveying used to be too expensive to do that often.

Re-survey by trigger, not by calendar

A 3D model of a scanned room in FIMIT, kept as an up-to-date record. — When a space changes, a fresh iPhone scan updates the 3D model and plan in minutes — so the record never drifts from reality.

A fixed schedule — say, every five years — tends to leave your records either needlessly re-done or badly out of date, and often both across a portfolio. A trigger-based approach keeps records accurate exactly where it matters. One caveat: where a lease, regulation or certification requires a periodic formal survey, that cadence still applies — trigger-based re-capture keeps the record current in between, it does not replace the certified survey.

After any fit-out, refurbishment or partition change.
On tenant change or when a space is subdivided or combined.
Before scoping a maintenance, cleaning or compliance project in that space.
When you inherit a building with drawings you cannot trust.

The maths that used to stop you

Trigger-based updating only works if capture is cheap. When each re-survey means a booked crew and a day on site, you ration it and your records drift. When a team member can re-capture a changed space in minutes with a phone, the calculation flips: keeping records current becomes the cheap option, and planning from stale drawings becomes the expensive one.

Make re-capture a routine, not a project

FIMIT is designed so updating a record takes minutes rather than a booked survey: walk the changed space with an iPhone or iPad Pro, and the updated 3D model and to-scale floor plan are generated automatically. Re-capture only what changed, keep one shared and current record per building, and stop planning from drawings you no longer believe.

Frequently asked questions

How often should you re-survey a building?

You should update a building record whenever the building changes, not on a fixed calendar schedule. A trigger-based approach — re-capturing after any fit-out, partition change, tenant change or subdivision — keeps records accurate exactly where it matters, while a fixed five-year cycle tends to leave records either needlessly re-done or badly out of date, often both across a portfolio. Where a lease, regulation or certification requires a periodic formal survey, that cadence still applies — trigger-based re-capture keeps the record current in between.

What events should trigger a building re-survey?

Re-survey after any fit-out, refurbishment or partition change; on a tenant change or when a space is subdivided or combined; before scoping a maintenance, cleaning or compliance project in that space; and whenever you inherit a building with drawings you cannot trust. These triggers catch the moments when a floor plan actually goes stale, rather than surveying on a timer.

Why is a fixed re-survey schedule a bad idea?

Relied on alone, a fixed schedule tends to spend effort re-surveying spaces where nothing has changed while leaving altered spaces inaccurate until the next cycle. Updating by trigger keeps every record current exactly where work has happened. A fixed cadence may still be required for compliance or certified records — the point is not to rely on it as the only time your floor plans get updated.

Does cheap iPhone re-capture change how often to update records?

Yes — it flips the economics. Trigger-based updating only works if capture is cheap, and when a team member can re-scan a changed space in minutes with a phone, keeping records current becomes the inexpensive option. Planning from stale drawings becomes the costly one instead. FIMIT is designed so updating a record takes minutes: walk the changed space and the updated plan is generated automatically.

About the author

Salar Kiabi, Founder, FIMIT

Salar Kiabi is the founder of FIMIT, which turns a single iPhone LiDAR walk-through into an accurate, to-scale 2D floor plan and 3D model for property and facility teams. He writes about measurement accuracy, capture technique, and getting a floor area from a phone that you can actually stand behind.