Golders Green
Flat-roof renewal
Before-and-after photographs show the existing covering and renewed liquid waterproofing.
London · Free roofing quotations
Liquid roofing in London
Seamless liquid waterproofing for flat roofs, roof terraces and residential blocks across London. See our work in Golders Green, Hampstead and Leyton, then discuss the right approach for your roof.
Roof leaking now? Call 020 8485 9967. Emergency calls answered 24/7; attendance is agreed by phone.
Completed Avent projects
Liquid roofing at three different scales.
Domestic flat roofs, roof terraces and a residential block, with photographs from the actual jobs.
Hampstead
Roof-terrace waterproofing
Follow the project from preparation and waterproofing to the finished roof terrace.
Leyton
Residential block renewal
Drone photographs show the block roof before and after its seamless liquid renewal.
Waterproofing around the shape of your roof
Liquid systems are applied to form a continuous waterproof layer. They can be useful around rooflights, corners, upstands and penetrations where the details need careful attention. Avent is a MonoSeal approved applicator and also works with Tecnopol Desmopol systems. We identify the proposed product in your quotation.
The roof beneath the coating matters
A coating should not conceal an unsuitable base. We consider the existing covering, signs of trapped moisture, the deck, drainage and the details around the perimeter. Some roofs need stripping and rebuilding; others may be suitable for an agreed overlay specification. An assessment is needed before choosing between them.
MonoSeal and Tecnopol Desmopol
MonoSeal is a hand-applied waterproofing membrane from Prokol. Desmopol is Tecnopol’s liquid membrane range. These are distinct products with their own application requirements. Product selection, preparation, reinforcement where required and finishing layers must follow the chosen specification. We will explain which system is proposed and why it suits the roof.
Extensions, garages and rooflights
Small domestic roofs deserve the same care as larger projects. We discuss how the roof joins the house, the height of the waterproofing at doorways and rooflights, and where rainwater drains. Tell us if the space beneath is heated or if you plan to change the way it is used.
What your quotation should explain
The written quotation should identify the preparation, proposed build-up, roof details, access and exclusions. Any manufacturer warranty is specific to the product and installation requirements; its duration and conditions are confirmed for your work. Free quotations for roofing works are separate from a commissioned condition report.
Explore related roofing services
Understand the roof before deciding
Need a detailed report first?
A formal roof survey is a separate paid service from a quotation for roofing work. Our surveys bring together internal and external checks, drone imagery where appropriate, and moisture readings in a detailed written report.
We agree the scope and fee before booking. The inspection approach depends on the property, access and conditions.
Explore our roof survey service ↗Help us understand the project
- Your property postcode and the roof area involved.
- Any leaks, previous repairs or existing reports.
- Whether the roof is a terrace, extension or part of a larger building.
- Access arrangements and any intended programme.
Mayfair · Balcony renewal
Waterproofing above occupied office space
Water was entering the office space beneath this Mayfair balcony. Avent renewed the balcony with liquid waterproofing and added an anti-slip finish.
A walk-on balcony needs a specification that considers its intended use as well as the waterproofing. Tell us how your roof or terrace is used, what lies below it and where water has been appearing.
Discuss your waterproofing project ↗Planning your project
What affects liquid roofing costs?
The area is only one part of the price. Preparation, the condition of the retained roof, drainage, rooflights, edges, access and any required removal or rebuilding affect the proposed scope.
We provide a free written quotation for roofing work after discussing the assessment needed. It identifies the proposed system and work included. An enquiry does not book a visit or commit you to the work.
Request a liquid roofing quotation ↗Liquid roofing across London
We welcome enquiries for homes, landlords and managed buildings, including North London, Hampstead, Highgate, Barnet, Finchley and Mayfair. Send the property’s full postcode and the roof area involved so we can confirm the next step.
If the roof is leaking, our flat-roof leak guide explains common defects and the questions to ask before choosing repairs or renewal.
Your questions
Common questions about liquid roofing
We agree the proposed system, preparation and roof details before you decide.
Can liquid waterproofing be applied over my existing flat roof?
Some roofs may be suitable for an overlay after assessment. The existing covering, retained construction, moisture and drainage need consideration. An unsuitable base may require removal or rebuilding rather than a new coating.
Is liquid roofing suitable for a balcony or roof terrace?
It can form part of a suitable specification. The system and finish need to reflect access, pedestrian use, drainage and connected details. Our Mayfair balcony and Hampstead terrace are examples of Avent’s work on these different roof areas.
How long will a liquid roof last?
There is no single lifespan or guarantee period for every liquid roof. The product, preparation, construction, use and maintenance matter. We identify the proposed system and confirm any applicable warranty terms for your project.
Should I repair the leak or renew the roof?
An isolated defect may be repairable. Widespread deterioration or problems beneath the covering may require a wider scope. We discuss the condition and proposed work; you do not need to choose a system before enquiring.
Start with a conversation
Get your free roofing quotation.
Tell us the property’s postcode, which roof needs attention and how we can reach you. We’ll discuss the assessment needed for a written quotation. Submitting an enquiry does not book a visit.
Speak to the team020 8485 9967
Email your enquiryinfo@aventroofing.co.uk
Tell us about your roof
Your postcode and a few details are all we need to start.