Mastic sealing for building owners and managing agents in North Kensington, Greater London
Mastic sealing for building owners, managing agents and housing associations in North Kensington and across Greater London. CHAS accredited, Constructionline member, with a 12-month guarantee on workmanship.
- Movement joints with sealant missing
- Draughts at frames across a block
- Old repairs sealed over failed mastic
Mastic sealing near North Kensington
Photos, a specification or a quick description of the joints is enough to start a fixed quote.
Mastic sealing for commercial buildings in North Kensington
We work for building owners, landlords with commercial or block portfolios, managing agents and housing associations. A planned, building-by-building programme often works better than reacting to each complaint and we quote and schedule each building in turn. If you have failed external movement joints and patchy repairs in mismatched sealant, we can put it right. One point of contact handles commercial sealant work in North Kensington from the first photographs to the final walk-round, whether it’s one building or several.
London has a large stock of purpose-built blocks, mansion flats and converted buildings managed by agents and housing associations. Mastic around windows, doors and balconies tends to fail across a whole block at a similar time, which is why block-wide programmes make sense.
We stand by our work: 12 months, guaranteed. That covers our preparation and application, and we come back if anything isn’t right.
- Location
- North Kensington (W10, NW10, W11)
- Wider area
- Greater London
- Guarantee
- A 12-month guarantee
- Quotes
- A fixed quote before we start
- Phone
- 01277 525 020
- Updated
- 3 November 2026
What happens if it’s left?
Dealing with failed joints one report at a time is slow and scattered. Planned resealing covers a whole building or estate in one go and is simpler to manage and budget. In a London building, a failed joint rarely affects only one party: water travels through shared structures, and a small leak becomes a dispute between occupiers. Dealing with it early is simpler for everyone.
Cost follows what’s involved: removing old material, preparing the joints, the product, the access and how the work is phased. Call for a quote and we’ll explain how it’s made up.
Why us?
- Colour agreed before work starts
- Our applicators hold CSCS cards
- 12-month guarantee on workmanship
- Work to your specification and the manufacturer’s guidance
Read our cost guide and our accreditations.
Also near North Kensington
Also in North Kensington
Block-wide mastic in North Kensington
For a London block, the agent or landlord typically handles notices to residents and access to flats. We fit the programme to your notice periods.
Trustees of buildings like Dissenters' Chapel can bring frame and external mastic into a planned maintenance list. Property owners at sites such as Latimer Industrial Estate (0.5 miles south-west of North Kensington) can have mastic renewed between lettings.
North Kensington is about 2 miles north-west of Kensington, in Greater London. Commercial clients in North Kensington can call on us for mastic joints. Our Greater London coverage takes in 764 places, large and small. There’s a separate page for London, about 6 miles away.
We take on mastic joints across the W10, NW10 and W11 postcode area, whatever the building. For a building on Peach Road, Barlby Road and Eynham Road or nearby, we can quote for mastic joints. Just outside North Kensington, we also work in Kensal Town (1 mile east), Kensal Green (1 mile north-west), Kensal Rise (1 mile north), Notting Dale (1 mile south-east) and White City (1 mile south). Nearby towns on our patch include London (6 miles east), City of Westminster (3 miles east), Marylebone (3 miles east), St Pancras (4 miles east), Shoreditch (6 miles east) and Walthamstow (9 miles north-east).
What’s near North Kensington
We work on buildings around Little Wormwood Scrubs, Maida Vale School and The Eagle pub. The nearest railway station is Kensal Green station, about 0.5 miles north. Well-known places in the area include Princess Louise Hospital (less than half a mile south-west) and Culture House (1.3 miles south). Open spaces near North Kensington include Campden Hill and Greville Place nature reserve.
Common problems we fix in North Kensington
Sunlight and weather break mastic down over time. The surface chalks, the body stiffens and cracks appear, especially on south and west faces.
It’s worth sending us details if you spot any of the following:
- Brittle perimeter mastic across a building
- Occupiers reporting cold air round windows
- Leaks at window and door perimeters
- The same joint failures repeated across a portfolio
Schools and community buildings such as Barlby Primary School need frame and external mastic kept sound like any building.
What your quote should include
- What site paperwork they can supply
- The terms of the workmanship guarantee
- Their plan for phasing and protecting the area
- Whether primer will be used where the manufacturer specifies it
How the quote is worked out
Each job is priced on its own details. The things that drive the figure:
- How much existing material needs removing
- The size and state of each joint
- Travel to remote or island sites
- How accessible the joints are
Every site prices differently: the joint sizes, the specified product, access and working hours each have a bearing. A fixed quote follows once we understand the job.
What we need to price the job
Whether it’s one area or a whole building, these details speed things up:
- Access details, including height
- Approximate linear metres or a joint schedule
- The site address and postcode
- The type of building and who uses it
Specifications, drawings and tender packages are welcome with any enquiry, and we will price against exactly what is specified. For smaller jobs, photographs and a description will do.
When to bring in a specialist
Using site staff can make sense for a small touch-up, but anything bigger is another matter: a specialist works through quantities efficiently, leaves a consistent finish and backs it with a 12-month guarantee.
The visible bead is only part of the job. Correct depth, the right primer and a sealant matched to the movement are where general trades tend to cut corners.
Surface by surface
Window and door perimeters on blocks
On most blocks, the frame-to-wall joint is where failure shows first. Old perimeter mastic is removed, the joint prepared and new sealant tooled in.
Tenement and older buildings
Traditional buildings have joints that need a careful approach. We look at the substrate before choosing a sealant.
How a job runs
In a busy building, we agree a sequence with your contact so the disruption stays in one area at once. Each area is protected, prepared and sealed, then handed back before the next one starts. All of Greater London is in the ULEZ, and kerbside space in North Kensington can be scarce. Let us know about any on-site parking or loading arrangements when you send the job details.
- We check the asbestos register for older buildings and look at the joints.
- A fixed quote covers the joints, products and order of work.
- Failed mastic is removed completely.
- Joint faces are cleaned, backed and resealed.
- Buildings are completed in turn.
Getting the site ready
- Tell staff and tenants when we’ll be in
- Clear stock, furniture or equipment away from the joints
- Send asbestos survey details if the building is pre-2000
Request a quote
A handful of photos and a postcode is the fastest way to a quote. Send them through the quote form, or call 01277 525 020 or use the quote form to discuss it first.
Advice
FAQs: North Kensington
Can you quote for a block close to Kensal Green station?
Yes, and several blocks can go on one quote. We work to your notice and access arrangements.
Do you work in London buildings with loading restrictions?
Yes. Booked loading bays, goods lifts and permit-to-work systems are normal for London jobs. Share the building’s contractor rules and we’ll work to them. All of Greater London is inside the ULEZ, and our planning allows for it
Can you seal joints high up on a block?
It depends on the building. How upper joints are reached is agreed before work is booked so the fixed quote reflects it.
When is resealing likely to be due?
There’s no fixed lifespan: movement, exposure, cleaning, traffic and the product all play a part. Treat them as maintenance items and inspect them regularly.
Does weather matter for sealant work?
For external joints, yes. The joint has to be dry and within the product’s temperature range, so frost, rain or cold mornings can delay outside work. Inside work is seldom held up.
Can people stay in the building while you reseal?
Occupiers stay in the building throughout. We flag any areas that need internal access well before the dates so you can arrange it with occupiers.
Who decides which product is used?
The specification comes first, if there is one. Without one, the joint decides: its movement, its surfaces and what it has to cope with.