Greater London · England
External Mastic in East Finchley
Problem with your movement joints in East Finchley? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Rain getting behind render or cladding at a joint
- Rigid filler in a joint that should flex
- Sealant pulling away from one side of the joint
How the job changes by surface
Joints between dissimilar materials
Each side of the joint may need its own preparation. Both surfaces are cleaned and primed as the product requires.
Cladding and façade panels
Panel systems often rely on sealant between and around the panels. We reseal them with a sealant suited to the panel material.
External mastic in East Finchley, done properly
Movement joints let brickwork, render and cladding expand and shrink without cracking. Its sealant has to flex with the building, season after season, so once it splits or hardens, the joint stops working and water gets in. Common call-outs are for leaking joints around cladding and façade panels and rigid filler in a joint that should flex, on render & cladding joints, concrete & block and joints between brick and frames.
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 East Finchley, check the lease for who looks after the outside.
Your job is guaranteed for a year, as with all our work.
- Where
- East Finchley (N2, N3, NW11)
- Region
- Greater London
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Also near East Finchley
Other services in East Finchley
What we’re called out for in East Finchley
Many joints fail because they were sealed too deep or with nothing behind them. If the sealant sticks to the back as well as the sides, it cannot stretch and tears as soon as the joint widens.
Any of these means the joints need attention:
- Failed sealant between panels on a façade
- Weeds or debris growing in open joints
- Movement joints with cracked, split or missing sealant
- Old sealant gone brittle and cracked
Schools such as Holy Trinity CofE Primary School are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Before booking anyone
- Whether the sealant suits the joint
- How the colour is chosen
- Whether all the old sealant comes out first
- How hidden problems are handled
Work for landlords, hotels and businesses
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we will quote.
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance that we can handle for you.
Common questions in East Finchley
Can you help a landlord with a rental near New Southgate station?
Yes. We work for landlords and agents as well as householders, and several properties can be quoted together. You can call 0345 464 0079 or email us with the details for a clear quote.
Is East Finchley in your area for external mastic?
Yes, East Finchley is within the area we cover. Our work covers London and the South East. You can phone 0345 464 0079 or drop us an email and let us know what needs doing.
Do you take out the old sealant first?
Always. Sealing over old sealant is the main reason resealing fails early, so we never do it.
Can you do several jobs on one visit?
Of course. Doing several areas at once is usually more efficient.
Is it worth trying it myself?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Do you work at height?
That depends on how high the joints are and the ground below. Ground-floor joints are simple; for higher work, tell us about the building and we’ll confirm what’s needed.
Should I point up the gap in my brickwork?
No. Mortar locks the joint solid, so the movement cracks the wall elsewhere. It needs a flexible sealant over backing rod.
What colours does the sealant come in?
Exterior sealants are made in a range of colours, from greys and browns to whites and stone shades. We choose the closest to your brick or render so the joint doesn’t draw the eye.
What happens if it’s left?
It often makes sense to reseal all the failing joints on an elevation together. Joints of the same age tend to fail together, and access only has to be arranged once. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and by the time it shows on a wall or ceiling in East Finchley, the repair is bigger than the sealant job would have been.
Every job is a little different, 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.
What you get with us
- Any old sealant cut out fully, not covered over
- Anti-fungal sanitary silicone in wet areas
- Arbo and Everbuild products
- Neat joints and a tidy finish
Read what affects the cost and our reviews.
What external mastic looks like in East Finchley
London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like Heath Hall (about 1.1 miles south) are a reminder that the area around East Finchley has older buildings as well as new. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
For an older house near a landmark such as Church of the Holy Trinity, an extension built onto an older house moves differently, and the joint between them takes the strain. As a London address, East Finchley can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
East Finchley is about 5 miles north of Marylebone, in Greater London. Anywhere in N2, we can carry out external mastic at your property. East Finchley is one of 764 places in Greater London we cover for external mastic. There’s also a page for London, roughly 7 miles from East Finchley.
Here we cover the N2, N3 and NW11 postcode area for external mastic. If you need external mastic at a property on Oak Lane, Maya Road and High Road or a nearby road, our applicators can take on the job. You will find East Finchley on the A1, so it’s easy for us to get to. Other places close to East Finchley include Hampstead Garden Suburb (1 mile south-west), Fortis Green (1 mile east), Temple Fortune (1 mile south-west), Muswell Hill (1 mile east) and Golders Green (2 miles south-west). Further out, we also cover London (7 miles south-east), City of Westminster (5 miles south), Marylebone (5 miles south), Kensington (6 miles south), St Pancras (5 miles south-east) and Shoreditch (6 miles south-east).
What’s near East Finchley
Typical jobs here are in homes near Tollington School, Francis Skaryna Belarusian Library and Museum and Bishop Douglass School Finchley, among other places. Nearby too are Lyttelton Playing Fields (0.5 miles south) and The Bald Faced Stag pub (0.5 miles east). The closest station to East Finchley is New Southgate station, roughly 2.2 miles north-east of the centre. Nearby you’ll also find Grand Arcade (1.6 miles north) and Jewish Museum - Finchley (0.7 miles north-west). The countryside around East Finchley includes Highgate Hill and Long Lane Pasture.
What sealant work can’t fix
Before booking, it’s worth knowing the limits too:
- Cracks in the bricks or render themselves, away from the joints
- Failed render or damaged cladding panels
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
If in doubt, ring 0345 464 0079 or drop us an email and we will say what we think.
Surfaces we seal
- Brickwork movement joints
- Joints between brick and frames
- Render & cladding joints
- Concrete & block
- Copings & trims
- Façade panels
The process
Good joint work is mostly preparation, so that’s where we spend the time. Every joint is cleaned and dried before new material goes in. All told, the work takes a few hours to a few days, depending on the length of joint and the access. In East Finchley, 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.
- We take out the old sealant until the faces are sound.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- Primer is applied wherever the sealant needs it.
- We gun in low-modulus sealant and tool it neatly.
Before we arrive
- Mention any tricky access
- Tell us if parking is tricky
- Let us know if you’ve seen damp or leaks
Get a quote
There’s no standard price list, because every job is different. Instead, we send you a clear quote for your job. To get started, phone 0345 464 0079 or send us an email.
Advice
Can I do it myself?
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.