Greater London · England
External & façade joints in West Hampstead, Greater London
We cover West Hampstead for sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Hard, crazed mastic that has stopped moving
- Movement joints with cracked, split or missing sealant
- Sealant pulling away from one side of the joint
What affects the cost of external mastic
You’ll get a clear quote before any work starts. It takes into account:
- When we can work, for business premises
- The size of the job
- The number of rooms or windows
- The old material and how stubborn it is
Combining jobs into one visit is usually more efficient than separate visits. You’ll get one clear quote for the whole job.
What we need to know
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- The problem you’ve noticed
- Access, such as stairs, a lift or height
- Pictures of the joints, sent by email
- Whether it has been sealed before
If you’re in West Hampstead and need external mastic, call 0345 464 0079 or email us. Tell us what the problem is and where, and you’ll get a clear quote before work begins.
External mastic for homes and businesses in West Hampstead
Getting the depth right is half the job. Closed-cell backing rod sets the depth and stops the sealant sticking to the back, so it bonds to the two sides only and can stretch. We work on copings & trims, render & cladding joints and façade panels, and the jobs we see most are joints where the bead has come unstuck and brick movement joints where the sealant has split.
London’s terraces and conversions often share walls, gutters and downpipes with their neighbours, so a leaking gutter joint or failed wall joint can affect more than one home. For a flat in West Hampstead, check the lease for who looks after the outside.
Big or small, it’s backed by our one-year guarantee.
- Location
- West Hampstead (NW3, NW6, NW2)
- Region
- Greater London
- Cover
- One year on every job
- Quote
- A clear price before we start
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
When to call us in West Hampstead
A lot of failed joints come down to preparation: joint faces that were dusty or damp, unprimed where they needed it, or still carrying old sealant. The sealant never bonds properly.
Common reasons people contact us are:
- Water getting into walls through failed joints
- Sealant pulling away from one side of the joint
- Cracked joints where brick meets render or frames
- Movement joints filled with mortar instead of sealant
If you let a flat or house near Finchley Road & Frognal station, split movement joints are easy to miss on a rental until damp shows inside.
Questions to ask before booking
- How the surfaces are prepared before sealing
- How much experience the applicator has
- Whether VAT is included
- Which sealant they’ll use, and why
The process
Once we’re on site, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. Most jobs then take anything from a few hours to several days, depending on the building. In West Hampstead, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- We gun in low-modulus sealant and tool it neatly.
Before we arrive
- Tell us about access, such as stairs, a lift or high-level joints
- Mention any parking rules near the property
- Where the joints are inside, avoid wetting them before we arrive
How to get a quote
To get a quote, call 0345 464 0079 or email us and tell us where the job is and what the problem looks like. We’ll give you a clear quote before any work starts.
Related advice
Why act early in West Hampstead
A properly done movement joint is an even line in a colour that suits the wall. A rushed bead with no backing looks untidy and does not last. In London conversions, one flat’s bathroom is often above another flat’s ceiling, and a slow leak from a failed seal can end up in the flat below. Putting it right early is much less trouble for homes in West Hampstead.
The cost depends on the size of the job, how hard the old material is to remove and access to the work. You will have a clear quote before any work starts, so you know where you stand.
Why book with us
- ARBOMaster approved applicator
- A choice of colours where the product allows
- Tidy, careful work
- A sealant colour to suit the surroundings
Read our cost guide or what customers say.
Honest limits
Before booking, it’s worth knowing the limits too:
- Cracking across the wall rather than at a joint
- Rising or penetrating damp from elsewhere in the wall
- Adding movement joints to masonry that has none
Not sure which it is? You can call 0345 464 0079 or send us an email and we’ll tell you honestly.
What we seal
- Copings & trims
- Façade panels
- Joints between brick and frames
- Concrete & block
- Brickwork movement joints
- Render & cladding joints
Different surfaces, different methods
Joints between dissimilar materials
Joints where frames, sills or panels meet the wall are common leak points. We cut out the old sealant and reseal with a product suited to both surfaces.
Concrete and blockwork
Blockwork and concrete shrink over time and move with the seasons. We reseal their joints with backing rod and a flexible product.
Towns and villages near West Hampstead
Also in West Hampstead
Walls and rooflines in West Hampstead
The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. With historic houses such as Fenton House (about 0.5 miles north-east) nearby, there’s older building stock in the area around West Hampstead as well as newer homes. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
Homes close to Presbyterian Church Of St Andrew include some older properties, and the joints between older walls, newer extensions and the roofline need a sealant that can move. West Hampstead is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
West Hampstead is about 3 miles north-west of City of Westminster, in Greater London. We provide external mastic to homeowners, landlords and businesses in West Hampstead and the surrounding area. Our Greater London coverage runs to 764 places, West Hampstead among them. London is on our list too, around 6 miles away.
Work in NW3, NW6 and NW2 works the same way as everywhere else we cover. Streets in the area include Mill Lane, Acol Road and Ajax Road, and we cover them all. West Hampstead is on the A502, so it’s easy for us to get to. Other places close to West Hampstead include Fortune Green (1 mile west), Hampstead (1 mile east), Greenhill (1 mile east), Childs Hill (1 mile north-west) and Vale of Health (1 mile north-east). We also work in nearby towns such as London (6 miles south-east), City of Westminster (3 miles south-east), Marylebone (3 miles south-east), Kensington (4 miles south), St Pancras (4 miles south-east) and Shoreditch (5 miles east).
Local landmarks in West Hampstead
Around West Hampstead, our work takes us to homes and buildings near South Hampstead High School, Holly Bush pub and Kilburn Grange Park and the streets around them. West Hampstead has its own railway station: Finchley Road & Frognal station. Nearby you’ll also find Isokon Gallery (1.2 miles east) and New End Hospital (0.5 miles north-east). The countryside around West Hampstead includes Parliament Hill and Westbere Copse.
Questions from West Hampstead
Do you work for landlords with property near Finchley Road & Frognal station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. You can phone 0345 464 0079 or send us an email with the details for a clear quote.
Is parking a problem for a job in West Hampstead?
Parking in West Hampstead, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot.
Do you hold any approvals?
Yes. We’re an ARBOMaster approved applicator, the approved applicator scheme for Arbo sealants.
Do you remove the old sealant?
Always. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
Do you come to West Hampstead?
Yes. We work in West Hampstead. For a quote, phone 0345 464 0079 or send us an email.
Can you reach joints on upper floors?
It depends on the building. We work on joints that can be reached safely. Give us some details and we’ll confirm the access.
Should I try DIY first?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
Do the sealants smell?
Sometimes, a little. Any smell clears as the sealant cures.
Landlord and commercial work in West Hampstead
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. We can quote for more than one property at once.
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance that we can handle for you.