
Completed in Highgate
Repairs to an older property
Avent carried out roof repairs, liquid waterproofing and cement works while retaining the building’s character. This is an example of our wider North London work, not a St John’s Wood project.
Repairs · Renewals · Roof details
Roof repairs, replacements and flat roofing for St John’s Wood homes and managed buildings in NW8. Tell us what needs attention and we’ll help you plan the next step.
Free roofing quotations. Formal roof surveys are a separate paid service. Emergency calls answered 24/7; attendance is agreed by phone.
Work by Avent
See genuine Avent repair and renewal projects from Highgate and Golders Green, with each location identified.

Completed in Highgate
Avent carried out roof repairs, liquid waterproofing and cement works while retaining the building’s character. This is an example of our wider North London work, not a St John’s Wood project.

Completed in Golders Green
Before-and-after photographs show the existing roof covering and the completed seamless liquid waterproofing.
A roofing project in St John’s Wood may need to accommodate several households, shared entrances or premises that remain open. Tell us who manages the property and how the roof can be accessed. Clear arrangements at the start help define the scope, the sequence of work and the information needed for a quotation.
Tell us where water is appearing, when it happens and whether you have noticed slipped tiles, damaged flashing or an overflowing gutter. We assess the affected roof areas and connected details before recommending a repair or discussing renewal. You do not need to know the cause before enquiring.
Request a roof repair quotation ↗ · Read our flat-roof leak guide
The specification needs to address the covering and its surrounding details, including drainage, insulation considerations and weathering around roof penetrations. If a managing agent or surveyor has already produced a schedule, share it so the proposed work can be discussed against the same information.
Leaks associated with a flat roof or roof terrace can involve outlets, thresholds, wall junctions and penetrations as well as the covering itself. Describe any standing water, changes after earlier work and the rooms affected. A surface overlay should only be considered after assessing the retained construction.
Let us know about concierge arrangements, agreed access hours, shared gardens and routes for deliveries. We discuss the working arrangements needed for the proposed roofing scope; attendance and programmes are confirmed after assessment.
If the property is within the St John’s Wood conservation area, start with Westminster’s boundary map and guidance before planning changes to the roof’s appearance. Share any existing approvals or material requirements when requesting a quotation.
NW8 · Enquiries welcome
Send your full postcode so we can confirm coverage and availability. Attendance is agreed after discussing the work.
Roofing for your property
01 / Roofing
Repairs for leaking roofs, slipped tiles and damaged flashing, with the proposed work explained before you agree.
03 / Roofing
Slate, tile and complete roof renewals, planned around your property.
Paid roof surveys
A separate paid roof survey can document observed defects and repair priorities before a purchase, an insurance enquiry or planned work. Tell us your purpose, any insurer requirements and who can arrange access to the property being surveyed. Acceptance of a report depends on the recipient’s requirements.
Our detailed reports can include internal and external checks, drone photographs where conditions and access allow, and moisture readings where relevant. We explain the scope and any inspection limitations before you book.
Your questions
If you have a specific concern about your roof, tell us when you enquire.
The cost depends on the defect, the affected area, materials and safe access. Tell us the property’s postcode and what needs attention so we can discuss the assessment needed for a free written quotation. Sending an enquiry does not book a visit or commit you to work.
Yes. Include the building address, the relevant contact and any existing report or works schedule. We can discuss the information and inspection needed to prepare a quotation.
Sometimes. We assess the covering, drainage and connected details before proposing the work. A local defect may be repairable, while widespread deterioration may call for renewal. We explain the proposed scope and any further investigation needed.
Yes. Our emergency phone line is answered 24/7. Call 020 8485 9967 to describe the leak and agree availability, attendance and charges. For a managed block, have the access contact ready; the online form does not book an emergency visit.
Start with a conversation
Include the NW8 postcode, whether this is a house or shared building, the affected roof area and who can arrange access. We’ll discuss the assessment needed for a written roofing quotation. You do not need a finished specification to enquire, and submitting the form does not book a visit.
Your postcode and a few details are all we need to start.