Greater London · England
External Mastic in Neasden
Professional external mastic in and around Neasden, with every bit of old sealant taken out first.
- Joints where the bead has come unstuck
- Failed seals between different materials
- Old sealant gone brittle and cracked
Why act early in Neasden
Done well, a resealed joint is a neat, straight line that suits the wall. A hurried job with smeared edges and no backing looks worse and fails sooner. Converted houses in London often have a bathroom above someone else’s living room, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Dealing with it early is far simpler for homes in Neasden.
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all play a part, and we’ll explain the quote if you ask.
Why book with us
- 4.9 on Google from 180+ five-star reviews
- Trusted Arbo and Everbuild sealants
- You choose the colour before work begins
- A sealant colour to suit the surroundings
About our external mastic in Neasden
For buildings in Neasden, we reseal external joints of all kinds, from brick movement joints to cladding panels. The preparation is the same whatever the wall: clean joint faces and the right depth. We work on copings & trims, façade panels and brickwork movement joints, and common reasons people get in touch are gaps where render, brick and frames meet 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 Neasden, check the lease for who looks after the outside.
Every job is covered by a 12-month guarantee, wherever you are in Greater London.
- Place
- Neasden (NW10, NW2, NW9)
- Region
- Greater London
- Cover
- One year on every job
- Price
- A clear price before work begins
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Landlord and commercial work in Neasden
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements.
From a single let to a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
Surface by surface
Joints between dissimilar materials
Different materials may need different primers. Both surfaces are cleaned and primed as the product requires.
Cladding and façade panels
Panels heat up and cool down quickly, so the joints work hard every day. We choose the product to suit.
Looking after it afterwards
So the new joints stay in good condition:
- Look over the joints every year, ideally after winter
- Keep movement joints as flexible joints, not mortar
- Have failed joints looked at early
- Tell anyone working on the walls about the movement joints
Don’t paint over the new sealant unless we’ve said the product is paintable. Paint can crack on a flexible joint.
A joint that has stopped moving pushes the movement elsewhere, often as cracks near the joint. Resealing it early helps prevent that.
Nearby places to Neasden
Other services in Neasden
DIY sealant or a professional job?
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it doesn’t work out, we can still put it right.
If you’ve already had a go yourself, that is fine. We cut it out and start again, so just mention it when you contact us.
Questions from Neasden
Do you work for landlords with property near Brent Cross West station?
Yes, we work for letting agents and landlords. You can call 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before work begins.
Is Neasden in your area for external mastic?
Yes, Neasden is within the area we cover. Our work covers London and the South East. Just ring 0345 464 0079 or drop us an email with a few details of the job.
Do you take out the old sealant first?
Yes. Sealing over the old bead is the commonest cause of early failure, so we never do it.
What do you put in the joint?
Each joint gets the product that suits it. Movement, water and weather all affect the choice, and we’ll explain our choice.
Can I do it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Will you leave a mess?
Tidy work is part of the job. Nearby surfaces are protected, and the area is left clean when we finish.
Why do you put foam in the joint first?
Closed-cell backing rod sets the depth of the sealant and stops it sticking to the back of the joint. Then the sealant bonds to two faces and can move.
How do you reach high-level joints?
It depends on the height and the site. Ground-floor joints are simple; for higher ones, send details and we’ll confirm the access.
The process
We bring everything the job needs with us. After a quick look at the joints together, the area is protected and the work begins. Most jobs take a few hours to a few days, depending on the length of joint and the access. For a job in Neasden, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor we are 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.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
Getting ready for the visit
- Mention any sign-in or site rules at work premises
- Where the joints are inside, avoid wetting them before we arrive
- Tell us about any previous sealing or DIY attempts
Get a quote
If you are in Neasden and need external mastic, ring 0345 464 0079 or send us an email. Tell us what the problem is and where, and you will get a clear quote before we start.
Read more
Do you need external mastic in Neasden?
Sometimes a movement joint was filled with mortar or a rigid filler. With the joint locked solid, the movement turns into cracks elsewhere in the wall.
It’s worth asking for a quote if you see:
- Panel joints letting water in
- Moss and dirt in joints with no sealant left
- Brick movement joints where the sealant has split
- Cracked joints where brick meets render or frames
If you let a flat or house near Brent Cross West station, outside joints that have cracked can let damp into a rental, so check them between lets.
What your quote should include
- What happens if they find a problem under the old sealant
- Who does the work, and how experienced they are
- Is the old sealant removed completely?
- When the joint can take water or movement
What external mastic looks like in Neasden
Historic houses like Fenton House (about 2.9 miles east) are a reminder that the area around Neasden has older buildings as well as new. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material. London terraces and converted houses often share gutters, downpipes and walls, so it’s worth agreeing who is responsible before work starts.
For an older house near a landmark such as St Catherine's Church Neasden with St Paul, old and new materials meet at the roofline and walls, which is where sealant earns its keep. For site and facilities teams at buildings such as Northview Junior and Infant School, larger buildings have long runs of movement joint that eventually need resealing.
Neasden is about 5 miles north-west of City of Westminster, in Greater London. Homes, rented property, offices and hotels in Neasden can book us for external mastic. Every job comes with our one-year guarantee. Neasden is one of 764 places in Greater London where we work. Our London page covers work nearby.
Postcode districts we cover here for external mastic: NW10, NW2 and NW9. Streets in the area include Dog Lane, High Road and Ilex Road. Nearby, we also carry out external mastic in Brent Park (1 mile west), Church End (1 mile south), Willesden (1 mile south-east), Dollis Hill (1 mile north-east) and Willesden Green (1 mile south-east). Larger places within reach include London (8 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).
Around Neasden
Typical jobs here are in homes near Gladstone Park, The Swaminarayan School and Crest Boys' Academy. The nearest railway station is Brent Cross West station, about 1.3 miles north-east. Well-known places in the area include Neasden Hospital (0.7 miles south-west) and London Designer Outlet (1.7 miles west). For a walk, there’s Westbere Copse and Castlebar Hill.