Why inspect the roof before a renovation?

Inspect before the scope becomes fixed

Arrange the baseline when you still have time to investigate a concern and adjust the work package. If the inspection is left until immediately before a contractor starts, there may be little opportunity to compare options or coordinate access.

Tell the inspector what the renovation involves. Repainting external joinery, replacing roof coverings and altering a building each create different questions. A general set of photographs is less useful than coverage that responds to the planned work.

Build a record that all parties can use

Identify each building and elevation, then connect detail photographs to their locations. Record existing visible conditions, previous repairs and any areas that could not be inspected. Keep the original files with the report so later comparisons are not limited to small embedded images.

A dated baseline documents what was visible at that time. It should not be presented as conclusive proof of responsibility for any later change. If a contractual or insurance dispute is a concern, obtain advice on the evidence and inspection scope needed for that purpose.

Separate observation, investigation and repair

These are three different stages. A photograph may show a raised flashing edge. A close inspection may then establish how it is fixed and whether a repair is needed. Only after that can the contractor describe a defensible repair scope.

If these stages are merged, a provisional concern can become a priced replacement without the missing diagnosis ever being supplied. Put unresolved items in the tender brief as questions or provisional investigations, with clear responsibility for resolving them.

• Observation: what is visible and where?
• Investigation: what needs to be confirmed and by whom?
• Decision: what action is justified by the findings?
• Verification: how will completion be recorded?

Compare contractor scopes, not just totals

Give contractors the same evidence and ask them to reference the relevant locations in their quotations. Check whether each proposal includes access, preparation, the repair itself, making good and completion records. A different total may result from a different assumption.

Where several confirmed tasks share an access requirement, ask whether coordination would be practical. Do not assume that every task should be bundled: specialist sequencing, material compatibility and other constraints may determine the order.

Agree useful inspection points during the work

Some details become visible only after coverings or finishes are removed. Discuss with the responsible professional which stages should be documented before they are covered again. A final aerial photograph cannot recover evidence of a concealed detail that was never recorded.

Name who will capture the photographs, how locations will be identified and where records will be stored. Keep this proportionate to the work, but avoid relying on an informal promise that someone will take pictures.

Finish with an updated maintenance baseline

At handover, connect the original findings to the work actually completed. Retain the contractor’s final scope, photographs and any relevant product or maintenance information. Mark remaining items as open rather than allowing them to disappear into a general completion note.

A follow-up exterior inspection can document visible outcomes and establish the next comparison point. Agree any additional testing or specialist sign-off separately. The result should be a record that helps maintain the building after the renovation team has left.