Greater London · England
External & façade joints in Church End, Greater London
Problem with your movement joints in Church End? We cut out the old, prepare the joints and apply the right sealant, with a one-year guarantee.
- Leaking joints around cladding and façade panels
- Gaps where render, brick and frames meet
- Brick movement joints where the sealant has split
Looking after it afterwards
Looking after new joints is easy, and it makes a real difference:
- Get split or bare joints resealed while the damage is small
- Make sure movement joints aren’t pointed over
- Walk round the building once a year and look at the joints
- Ask before painting over external sealant
Look over the joints once a year, ideally after winter. Splits, gaps at the edges or plants in the joint are early warning signs.
An open movement joint lets rain into the wall every time it pours. That can lead to damp patches, staining and frost damage, all bigger jobs than a reseal.
External mastic in Church End, done properly
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 render & cladding joints, brickwork movement joints and façade panels, and the jobs we see most are sealant that has lost its bond to the brick or render and moss and dirt in joints with no sealant left.
London’s terraces and conversions often share walls, gutters and downpipes with their neighbours, so one failed joint can cause damp for more than one household. In a converted house in Church End, it’s worth checking who is responsible for the outside before booking.
Your job is guaranteed for a year, as with all our work.
- Where
- Church End (NW10, NW2)
- Region
- Greater London
- Cover
- 12 months on all our work
- Price
- A clear price before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Walls and rooflines in Church End
London terraces and converted houses often share gutters, downpipes and walls, so check who is responsible for the outside before booking. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you live in an older home near Church of St Mary, the joints between older walls, newer extensions and the roofline need a sealant that can move. Church End is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Church End is about 3 miles west of Hampstead, in Greater London. Wherever you are in the NW10 postcode area, we can carry out external mastic at your property. Our Greater London coverage runs to 764 places, Church End among them. Our London page covers work nearby.
Here we cover the NW10 and NW2 postcode area for external mastic. That includes homes and businesses on Fry Road, Park Road and High Road and the roads around them. Neighbouring places we cover for external mastic include Brent Park (1 mile north-west), Stonebridge (1 mile south-west), Neasden (1 mile north), Harlesden (1 mile south) and Willesden (1 mile east). Larger places within reach include London (7 miles south-east), City of Westminster (5 miles south-east), Marylebone (5 miles south-east), Kensington (4 miles south-east), St Pancras (6 miles east) and Shoreditch (8 miles east).
Near you in Church End
In Church End, that means homes and buildings near Stonebridge Park Public House, The Swaminarayan School and St Claudine's Catholic School for Girls, among other places. Church End’s nearest station is Harlesden station, about 0.7 miles south-west. Nearby you will also find Neasden Hospital (0.5 miles north-west) and Brent Museum and Archives (1 mile east). The countryside around Church End includes The Long Water and Castlebar Hill.
What we are called out for in Church End
Poor preparation causes many early failures: 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.
Common reasons people contact us are:
- Damp patches traced to an open external joint
- Panel joints letting water in
- Gaps where render, brick and frames meet
- Plants rooting in failed movement joints
Rented homes near Harlesden station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets.
What to look for in a quote
- Whether the sealant suits the joint
- What the cure time is
- How much experience the applicator has
- What happens if they find a problem under the old sealant
Why deal with it now?
Pointing a movement joint with mortar might seem a neat fix, but it locks the joint solid. The movement then cracks the brickwork or render nearby. The correct repair is a flexible sealant with the right backing. In a flat in Church End, failed sealant seldom stays inside your own four walls: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
We don’t show prices on the website, because each job is priced on what it involves. Call for a quick quote and we will talk you through it.
What you get with us
- Anti-fungal silicone where joints get wet
- Colour agreed with you before any work starts
- ARBOMaster approved applicator
- A 12-month guarantee on all work
See what affects the cost and customer reviews.
When it isn’t the sealant
Before you book, it’s worth knowing the limits:
- Rising or penetrating damp from elsewhere in the wall
- Cracks in the bricks or render themselves, away from the joints
- Failed render or damaged cladding panels
If you’re not sure, just ring 0345 464 0079 or email us and we will give you a straight answer before booking.
Where we work in Church End
- Brickwork movement joints
- Render & cladding joints
- Concrete & block
- Copings & trims
- Joints between brick and frames
- Façade panels
Questions from Church End
Can parking be tricky for a visit in Church End?
Parking in Church End, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Is Church End in your area for external mastic?
Yes, Church End is within the area we cover. Our work covers London and the South East. Just ring 0345 464 0079 or email us with a few details of the job.
Why do you put foam in the joint first?
Backing rod controls the sealant depth and keeps it off the back of the joint. That way it bonds to the two sides only and can stretch.
Can I add another job to the visit?
Of course. Doing several areas at once is normally more efficient, so mention them when you ask for a quote.
Is it messy?
No. The area is protected while we work and cleaned up afterwards.
What’s an expansion joint in brickwork?
Walls move with heat, cold and moisture, so long walls have planned gaps to take that movement. The gap is sealed with a flexible sealant over backing rod.
Should I point up the gap in my brickwork?
No. Rigid materials can’t move with the wall. Where a joint has been mortared, it can often be raked out and sealed properly.
Can new sealant go over the old?
No, and we never do. It can look neat for a few weeks, but the new bead soon lifts. The old sealant has to come out completely.
Landlord and commercial work in Church End
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements.
Also near Church End
What else we do in Church End
Surface by surface
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.
Concrete and blockwork
Big joints in concrete need careful depth control. We size the backing rod to the gap.
How the visit works
Every visit runs the same way: we check the joints, mask and protect the surrounding surfaces, do the work and tidy away. It generally takes a few hours to a few days, depending on the length of joint and the access. In a London area like Church End, the main things to plan are parking and access: tell us about permits, visitor bays or off-street space, which floor we’re working on and whether there’s a lift.
- We start by walking round the building and agreeing the joints and the access.
- We cut out the old mastic and rake out anything in the joint.
- Joint faces are cleaned back and primed if the sealant needs it.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
Getting ready for the visit
- Let us know about parking restrictions
- Let us know if you’ve seen damp or leaks
- On commercial sites, let us know about site rules
Get a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll explain how we’d tackle it. When it suits you, phone 0345 464 0079 or drop us an email.