Planning roof work on an operational building

Roof work over a working warehouse, factory or commercial building needs a plan that accounts for the people and activities below. Phasing can help limit disruption, but some areas may still need temporary closure or restricted access. Agreeing those constraints before pricing and programming the work makes the proposed scope easier to assess.

Start with the building's operations

Give the contractor a clear picture of how the premises work: operating hours, delivery routes, busy periods and any activities that cannot be interrupted. Identify vulnerable stock, electrical equipment, production areas and roof-mounted plant.

Also flag fire routes, noise or odour restrictions and times when a bay can be cleared. The useful question is which activities can continue safely during each phase, and which need protection, relocation or an agreed interruption.

Confirm the roof condition before fixing the programme

The proposed method depends on the roof and its supporting structure. A survey should identify defects, access constraints and any further investigation needed. For older buildings, relevant asbestos information must be checked before work that could disturb the fabric, with an appropriate asbestos survey where required.

A register may not provide all the information needed for the proposed work. Any missing information should be resolved before the method and programme are finalised. Unexpected suspected asbestos needs a procedure for stopping affected work, obtaining competent advice and revising the plan.

The scope also affects disruption. Overcladding retains the existing roof where suitable, while roof replacement involves removing the existing covering. Neither option should be chosen solely because the building needs to stay open.

Agree phasing and temporary protection

The contractor should explain the sequence of work, which areas below each phase are affected and how those areas will be protected. Where covering is removed, ask how open sections will be managed and what temporary weather protection will be used.

Agree the end-of-day arrangements and any local shutdowns. Phasing reduces the amount of roof opened at once, but it does not guarantee uninterrupted operations or eliminate weather risk.

Plan access, exclusions and contingencies

Access and protection should follow a site-specific risk assessment and method statement. These should cover fragile surfaces, falling materials, exclusion zones, rescue arrangements and how workers and deliveries reach the site without conflicting with the building's operations.

Ask what weather conditions will stop work, who makes that decision and how changes are communicated. The plan should address temporary protection, unexpected defects and an urgent leak, including who the building team contacts outside normal working hours.

Keep the people below informed

Agree a named contact on each side and a practical update schedule. A short look-ahead should identify affected bays, access restrictions and expected noise. Changes that affect safety or operations need prompt communication rather than waiting for the next meeting.

• Which areas must be cleared, protected or closed in each phase?
• What protection is planned while the covering is open?
• What would trigger a pause or change to the programme?
• Who approves changes and communicates them to the building team?
• What inspections and handover records will be provided?

Use the answers alongside evidence of relevant occupied-site experience to assess the proposal. To discuss your building's constraints, contact us about planned roof work with the location, operating hours and areas that need to remain available.