Can roof work go ahead while the business stays open?

A closed building is simple: the roofers take over. An open one means two operations share the same site, and the plan has to keep them apart. The questions we ask at the survey are practical. Where do deliveries arrive, when are the busiest hours, who works under which part of the roof, and what in the building cannot get wet, dusty or noisy?

The answers shape everything else: the order in which we work, where the skip and the materials go, which entrance we use and when we stop for the day. A plan written round your trading pattern is worth more than a quick price. It also helps to name one person on your side who can say yes or no to a change of plan during the day.

Tell us about anything sensitive underneath, such as food, electronics, records, clean areas or customers who are elderly or have young children. A good programme is built around those, not squeezed past them. Our commercial roofing page lists the other jobs we plan this way.

The core rule is that no area is opened unless it can be closed again before the crew leaves. On a sheet roof, that means stripping and replacing in runs that fit within a working day. On a flat roof, it means laying the new covering in sections and sealing each edge at the end of the shift, so a shower overnight meets a waterproof roof.

Temporary covers and weather checks back the plan up. When the forecast turns, the work stops at a safe point and the open area is covered. Our guide to commercial roof work in winter explains why timing matters more in colder months.

Phasing is also why a job over a trading building can take longer than the same job on an empty one. You trade the extra days for staying open, and for most businesses that is the right trade. On a roof with several slopes, the order of working is chosen so any hold-up from the weather falls on the part of the job that is already protected.

Scaffold and hoists take up space, and on a high street unit they can sit over a public pavement or road. That needs a scaffold licence under the Highways Act, which in West Sussex is granted by the county council. The council asks for at least 10 working days between application and erection, so the lead time goes into the programme early.

Around the scaffold, the plan covers safe routes for staff and customers, protection above entrances, a clear zone below any area where materials are lifted, and a place for deliveries. Our page on roof edge protection shows how the perimeter is handled.

A vehicle yard shared with deliveries needs its own plan: marshalled loading, a fenced skip and a firm rule that nothing is lifted over a moving vehicle. Those arrangements are agreed with your site manager before the first sheet comes off.

Stripping sheets is noisy, and fixing them is noisier. Cutting, drilling and dropping off-cuts all carry into the building below. We can arrange the loudest tasks for the quietest parts of your day, but silence is not on offer. Dust falls through gaps in old roofs, so the areas beneath are covered and cleaned afterwards.

Some coverings and adhesives smell while they cure. If staff or customers are sensitive, tell us, and we can discuss other systems or timing.

Where the covering is asbestos cement, stricter rules apply. HSE's guidance puts careful removal, without breaking the sheets up, in the non-licensed category, and substantial breakage makes it notifiable. Waste goes into a locked skip. Our page on the asbestos cement industrial roof explains why the area below may need to be cleared while sheets come off.

Sometimes the sensible answer is to move people or stock. A full roof strip over a food preparation area, a data room or a high-value stockroom puts the contents at risk if the weather turns, and emptying the section for a few days costs less than damaged stock or a lost trading day.

It is also worth checking with your insurer and your landlord or freeholder before work starts, since a lease or a policy can carry conditions about building work. Tell neighbouring tenants too, as noise and scaffold affect them.

All of this is set out when we survey, alongside photographs of the roof and a list of what needs to move. A written quote follows with one price for the whole job, and our repair or replace guide helps decide how big the job should be.