Greater London · England
External & façade joints in Childs Hill, Greater London
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Childs Hill and across Greater London. Fully insured, ARBOMaster approved and guaranteed for a year.
- Joints where the bead has come unstuck
- Plants rooting in failed movement joints
- Rain getting behind render or cladding at a joint
Landlords, agents and businesses in Childs Hill
For anyone letting property in or around Childs Hill, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs, and photos by email help.
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
About our external mastic in Childs Hill
Failed sealant is cut out, the depth set with closed-cell backing rod, and the joint resealed with a low-modulus sealant made for outside. We pick a colour that sits well with the wall. We work on concrete & block, copings & trims and façade panels, and common reasons people get in touch are water getting into walls through failed joints and plants rooting in failed movement joints.
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. For a flat in Childs Hill, check the lease for who looks after the outside.
Each job carries a 12-month guarantee.
- Where
- Childs Hill (NW2, NW3, NW11)
- Region
- Greater London
- Cover
- One year on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Aftercare tips
No joint lasts for ever, but care makes a real difference. Our tips:
- Make sure movement joints aren’t pointed over
- Leave the joints unpainted unless we have said otherwise
- Keep water from gutters off the wall
- Keep soil, plants and ivy away from the joints
Avoid pressure-washing straight into the joints. A strong jet can damage the edges of the bead over time.
Leaks behind façade panels and render often go unseen. By the time there’s a damp patch, the damage can be well established.
What external mastic looks like in Childs Hill
London terraces and converted houses often share gutters, downpipes and walls, so it’s worth agreeing who is responsible before work starts. With historic houses such as Heath House (about 0.7 miles east) nearby, there’s older building stock in the area around Childs Hill 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.
Rented homes near Cricklewood station change hands often, and split movement joints are easy to miss on a rental until damp shows inside. For an older house near a landmark such as All Saints, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Childs Hill is about 1 mile north-west of West Hampstead, in Greater London. We carry out external mastic for homes and businesses in Childs Hill and nearby, as part of our work across Greater London. Across Greater London, we cover 764 places, and Childs Hill is one of them. We also work in London, about 6 miles from Childs Hill.
We work across NW2, NW3 and NW11 for external mastic and the streets around it. External mastic is available to properties on Nant Road, Ridge Road and Garth Road. We also cover Fortune Green (1 mile south), West Hampstead (1 mile south-east), Golders Green (1 mile north), North End (1 mile north-east) and Vale of Health (1 mile east). Larger places within reach include London (6 miles south-east), City of Westminster (4 miles south-east), Marylebone (4 miles south-east), Kensington (4 miles south), St Pancras (4 miles south-east) and Shoreditch (6 miles south-east).
Near you in Childs Hill
We work in homes and buildings around St Vedasts School For Boys, Hampstead School and The Old Bull and Bush pub, among other places. The nearest railway station is Cricklewood station, roughly 0.7 miles south-west of the centre. Other landmarks nearby include O2 Centre (1.2 miles south-east) and New End Hospital (0.9 miles east). The countryside around Childs Hill includes Parliament Hill and Westbere Copse.
Do you need external mastic in Childs Hill?
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 new sealant then lets go long before it should.
Signs it’s time to call us include:
- Movement joints filled with mortar instead of sealant
- Weathered mastic that no longer stretches
- Movement joints with cracked, split or missing sealant
- Leaking joints around cladding and façade panels
Childs Hill is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Comparing quotes
- What insurance they hold
- How hidden problems are handled
- The length of the guarantee
- Whether you can choose the colour
What affects the quote in Childs Hill
We don’t publish a price list, because no two jobs are the same. The quote depends on:
- Whether the work is at height
- How many areas need sealing
- How much old sealant there is and how hard it is to remove
- Any mould that needs treating
Rather than a set price list, 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.
Asking for a quote
Photos help, but a description is a good start. Please mention:
- The problem you’ve noticed
- Whether it’s a home or a business
- Whether it has been sealed before
- Any access issues, like height or stairs
To get a quote, phone 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. You will have a clear quote before work begins.
What happens if it’s left?
A low-modulus sealant is chosen because it moves without pulling hard at the edges. That matters on brick, render and concrete, which can be weaker at the face. Too stiff a sealant can pull at the edges and break them. In a London flat, a failed joint rarely stays your problem alone: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you’re not sure whether it needs doing, call 0345 464 0079 or email us and we will give you an honest view and a quote.
What you get with us
- Over 20 years’ experience
- An ARBOMaster approved applicator
- 12-month guarantee on every job
- White, clear, grey or coloured to suit, where the product allows
Towns and villages near Childs Hill
What else we do in Childs Hill
Your questions about external mastic in Childs Hill
I let a flat near Cricklewood station. Can you help?
Yes. We work for letting agents and landlords as well as homeowners, and several properties can go on one quote. Just ring 0345 464 0079 or send us an email with the address and what needs doing, and we will send you a clear quote.
Is parking a problem for a job in Childs Hill?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. That way the visit can be planned around it.
Do you work at height?
It depends on the height and the site. Ground-floor joints are simple; for higher work, tell us about the building and we will confirm what’s needed.
Do you seal joints where cladding meets other materials?
Yes. Different materials move at different rates, so a flexible sealant is needed where they meet. We choose one that suits both surfaces.
Are you an approved applicator?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
What information do you need?
The location, the problem and the rough size of the job. If you can, email a few photos.
Is the work guaranteed?
Yes, always. There’s a 12-month guarantee on every job.
Will you leave a mess?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.
The process
Good joint work is mostly preparation, and we do not rush it. Joints are cleaned back and dried before anything new goes in. In total, it usually takes a few hours to a few days, depending on the length of joint and the access. In Childs Hill, as in most of London, parking needs a little planning. It helps if you can point us to a visitor permit or a bay close to the door.
- First, the joints are inspected and the access agreed.
- Every bit of old sealant and any mortar or debris is cut out.
- Joint faces are cleaned back and primed if the sealant needs it.
- We fit closed-cell backing rod to control the depth.
- We apply the sealant, tool it and check the whole run.
Before we arrive
- Let us know if you’ve seen damp or leaks
- On commercial sites, let us know about site rules
- Tell us about access, such as stairs, a lift or high-level joints
Get a quote
Getting a quote is simple: let us know the job and the location and its rough size. Photos by email help us understand the job.
Related advice
Should I try it myself first?
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is.