Repairs · Flat roofs · Planned replacements
Commercial roof repairs & replacements in London
Commercial roof repairs, flat-roof renewals and replacements for offices, residential blocks and managed properties across London. Tell us about the leak or planned work and request a written quotation.
Roof leaking now? Call 020 8485 9967. Emergency calls answered 24/7; attendance is agreed by phone.
Our work · Mayfair
Balcony renewal above commercial office space
Water ingress from a Mayfair balcony was affecting the office below. Avent renewed the balcony and added an anti-slip finish.
For a leaking roof, balcony or terrace above occupied rooms, tell us where water is appearing, how the outside area is used and who can arrange access. We’ll discuss the assessment needed before setting out the proposed work in a written quotation.
A completed Avent project
Insulated warm-roof renewal for a Leyton block.
Leaks were affecting several flats. Avent renewed the roof with insulation, warm-roof construction and a Tecnopol liquid waterproofing system. The drone photographs show the same block before and after renewal.
Commercial roof repairs: investigate the leak before choosing the work
Water appearing inside an office or top-floor flat does not identify the entry point on its own. Tell us where and when the leak appears, which rooms are affected and what repairs have already been attempted. We consider the roof covering, connected flashings, outlets and wall junctions when discussing the investigation needed.
A local repair may be appropriate where the defect is isolated and the surrounding roof remains serviceable. Repeated leaks or wider deterioration may call for renewal. We explain the proposed roof area and associated details in the quotation, rather than assuming that every leaking roof needs replacing. Compare roof repair and replacement.
Commercial flat-roof renewal and liquid waterproofing
The condition of the covering and deck, insulation considerations, drainage and connected details all affect the renewal specification. Liquid waterproofing may be suitable where the existing construction and chosen system allow. An overlay should not conceal unresolved defects: the need for preparation, investigation or removal of existing materials must be considered first. Roof hatches, equipment, penetrations and upstands also need attention. Explore liquid roof waterproofing.
Pitched roofs and associated work
For slate and tiled roofs, a renewal can include underlay, battens, ventilation, ridges, valleys and leadwork. Existing chimneys and rainwater details can be considered alongside the main covering. Share known defects early so access can be planned for the intended work.
Work around the people using the building
Tell us about occupied areas, access hours, shared entrances and building management arrangements. A proposed programme should take account of the roof, site access and relevant operational requirements. We discuss the arrangements before the work is agreed.
Reporting before committing to major work
A separately commissioned roof survey can help record condition, highlight limitations and explain recommended works. If a report is already available, share the relevant sections so quotations can be discussed against a clear scope. Avent also carries out roofing; a survey does not commit you to using us for the subsequent works.
Help us understand the project
- Property address and building use
- Roof areas and existing covering
- Inspection report or works schedule
- Access and occupancy requirements
- Intended programme and key contacts
Explore the roofing scope.
01 / Roofing
Roof replacements
Slate, tile and complete roof renewals, planned around your property.
03 / Roofing
Roof repairs
Leaks, damaged coverings and roof details, with the repair scope based on the condition found.
Plan the work
What affects the cost of commercial roof repairs and replacement?
The extent of the defect, roof area, existing covering and safe access all influence the price. A quotation also needs to account for the connected details, preparation, waste removal and any restrictions around the occupied building. If concealed damage requires further investigation, we discuss how that affects the proposed scope.
Send any existing report or works schedule, but you do not need one to make an enquiry. Ask for the roof areas, materials, access arrangements and exclusions to be set out so you can compare proposals. Use our roofing quotation checklist.
Request a commercial roofing quote ↗
Need a documented condition assessment first? A formal roof survey and written report is a separate paid service, with scope and fee agreed before booking.
Common questions about commercial roofing
Can you quote for roof repairs as well as a full renewal?
Yes. Tell us about the leak, previous repairs and the roof area involved. We assess the condition before recommending a repair or renewal; a complete replacement is not assumed to be necessary.
Can the building remain occupied during roofing work?
Tell us how the building is used, which areas are occupied and any restrictions on access or working hours. We discuss the proposed programme and arrangements before work is agreed. Whether particular areas can remain in use depends on the work and site conditions; uninterrupted use is not promised.
Can you waterproof an existing commercial flat roof?
Sometimes an existing roof may suit liquid waterproofing, but suitability depends on its condition, construction and compatibility with the chosen system. Covering over an unresolved defect is not a substitute for assessing it. We discuss preparation, connected details and any removal needed before agreeing the scope.
What should a managing agent send with an enquiry?
Start with the property postcode, roof problem and a contact who can arrange access. If available, include an existing report or works specification and tell us about occupied spaces and access restrictions. You do not need a complete specification to start a conversation.
Is a roofing quotation the same as a roof survey?
No. Roofing quotations set out proposed work and are free. A detailed condition survey with a written report is a separate paid service, with its scope and fee agreed before booking.
Does submitting the form book a visit?
No. We use your details to discuss the project and agree the next step. A visit or roofing work is arranged separately. For an active leak, call 020 8485 9967 to discuss urgent help.
Start with a conversation
Discuss your roofing project.
Share the property postcode, the leak or work required and how the building is used. Mention access restrictions and any existing report or specification. We’ll contact you to discuss the assessment needed for a written quotation. Submitting this form does not book a visit or commit you to work.
Tell us about your roof
Your postcode and a few details are all we need to start.