Greater London · England
North Kensington External Mastic
External mastic for North Kensington, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Joints pointed up with cement by mistake
- Hard, crazed mastic that has stopped moving
- Movement joints with cracked, split or missing sealant
What the job involves on each surface
Joints between dissimilar materials
Different materials may need different primers. We prepare both faces so the sealant bonds properly.
Cladding and façade panels
Where a cladding system has its own specified sealant, we follow it. Send us any details you have about the façade.
External mastic for homes and businesses in North Kensington
Joints between dissimilar materials, like brick against render or concrete against a steel frame, see movement from both sides. A flexible sealant bridges the two where a rigid filler would soon crack. We work on façade panels, concrete & block and copings & trims, and the jobs we see most are cracked joints where brick meets render or frames and movement joints filled with mortar instead of sealant.
In London terraces and converted houses, gutters and walls are often shared with the house next door, so one failed joint can cause damp for more than one household. For a flat in North Kensington, check the lease for who looks after the outside.
A one-year guarantee comes as standard.
- Place
- North Kensington (W10, NW10, W11)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Quotes
- A clear price before we start
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Work for landlords, hotels and businesses
In hotels, rooms out of use cost money, so the work can be planned room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
Letting agents often deal with us directly. Tell us the address, the job and how access works and we will quote.
Walls and rooflines in North Kensington
With historic houses such as Kensington Palace (about 1.9 miles south-east) nearby, there’s older building stock in the area around North Kensington as well as newer homes. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
As a London address, North Kensington can be tricky for parking: let us know about parking bays, permits or a driveway. Schools such as Barlby Primary School are buildings too, and its movement joints, gutters and trims need looking after like any other building’s.
North Kensington is about 2 miles north-west of Kensington, in Greater London. Homes, rented property, offices and hotels in North Kensington can book us for external mastic. The work is guaranteed for a year. Across Greater London, we cover 764 places, and North Kensington is one of them. For nearby work, see our London page, about 6 miles away.
We work across the W10, NW10 and W11 postcode area for external mastic and the streets around it. Whether your property is on Peach Road, Barlby Road and Eynham Road or anywhere close by, our applicators can take on the job. If you’re just outside North Kensington, we cover 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). Larger places within reach 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).
Local landmarks in North Kensington
Locally, jobs take us to homes and businesses close to Little Wormwood Scrubs, Maida Vale School and The Eagle pub. For rail, the closest station is Kensal Green station, about 0.5 miles north. Well-known places in the area include Princess Louise Hospital (under half a mile south-west) and Culture House (1.3 miles south). Not far away are Campden Hill and Greville Place nature reserve.
FAQs for North Kensington
Do you work for landlords with property near Kensal Green station?
Yes, landlords and agents are among the people we work for. You can ring 0345 464 0079 or email us with the details for a clear quote.
Is parking an issue for external mastic in North Kensington?
Parking in North Kensington, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot.
Can you do several jobs on one visit?
Yes. Several rooms, windows or areas can go on one quote.
Do I have to be there?
We need access to the joints, so we will agree that with you when we book. Indoors, that normally means someone at home.
Do you seal joints where cladding meets other materials?
Yes. We cut out the old sealant, prepare both faces and reseal with a flexible exterior product. The colour is chosen to suit.
How long before the joint can be used?
Different products cure at different speeds, so please follow the time we give you.
Is it OK to fill a movement joint with cement?
No, not where the gap is a movement joint. Pointing it stops it working, and the wall may crack nearby. A flexible sealant is the right fill.
What does external mastic cost?
The cost depends on the size of the job, access and how much old sealant has to come out. Call for a quick quote.
What we do, step by step
At the end, we look at the finished work together and explain the cure time. The work normally takes anything from a few hours to several days, depending on the building, depending on the amount of work. For a job in North Kensington, parking and access are the things to plan: let us know about parking, the floor we will be working on and any lift or shared entrance.
- We start by checking each joint, agreeing the ones to redo and how we’ll reach them.
- We cut out the failed sealant and rake out any dirt or growth.
- The joint faces are cleaned and primed where the sealant needs it.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Before we arrive
- Try not to wet indoor joints just before the visit
- Let us know about stairs, lifts or work at height
- Mention any parking rules near the property
How to get a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is.
Related advice
Do you need external mastic in North Kensington?
A lot of failed joints come down to preparation: dusty or wet faces, no primer where one was needed, or old sealant left in. The new sealant then lets go long before it should.
People generally contact us after spotting something like this:
- Cracked joints where brick meets render or frames
- Joints where the bead has come unstuck
- Joints pointed up with cement by mistake
- Hard, crazed mastic that has stopped moving
For an older house near a landmark such as Dissenters' Chapel, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Comparing quotes
- Which colour the sealant will be
- Who turns up on the day
- What insurance they hold
- Is the old sealant removed completely?
How we quote for external mastic
We do not publish a price list. What we look at:
- The size of the job
- Whether old sealant or filler has to be cut out
- Whether the work is at height
- When we can work, for business premises
Instead of a standard rate, we look at what your job involves: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
What to tell us for a quote
When you call or email, it’s useful to know:
- If it’s domestic, commercial or a hotel
- Photos by email, if that is easy
- Any access issues, like height or stairs
- How many joints, rooms or windows are involved
There’s no standard price list, as no two jobs are quite the same. Instead, we send you a clear quote for your job. To get started, ring 0345 464 0079 or email us.
When something else is needed
We’d rather tell you now than do work that will not last, so these are the limits:
- Movement that’s more than a sealant joint can take
- Cracked brickwork or render that needs a builder or plasterer
- Loose or hollow render, which needs re-rendering
If in doubt, ring 0345 464 0079 or email us and we’ll say what we think before you book.
Where we work in North Kensington
- Façade panels
- Joints between brick and frames
- Render & cladding joints
- Copings & trims
- Brickwork movement joints
- Concrete & block
Towns and villages near North Kensington
Other services in North Kensington
What happens if it’s left?
A low-modulus sealant is chosen because it moves without pulling hard at the edges. That protects surfaces like brick, render and concrete. Too stiff a sealant can pull at the edges and break them. In London conversions, one flat’s bathroom is often above another flat’s ceiling, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Putting it right early is much less trouble.
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, along with when we can work on site. Call for a quick quote and we will go through it with you.
Why us?
- White, clear, grey or coloured to suit, where the product allows
- Colour agreed with you before any work starts
- We never seal over old sealant
- Fully insured
Take a look at how sealant jobs are priced and customer reviews.