Greater London · England
External Mastic in Kitts End
External mastic in Kitts End from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Hard, crazed mastic that has stopped moving
- Rigid filler in a joint that should flex
- Failed seals between different materials
How to look after the new joints
How long the joints last depends on use and care. Here’s what we suggest:
- Check the sealant is paintable before painting near it
- Make sure movement joints are not pointed over
- Do not let climbing plants root in the sealant
- Deal with leaking gutters that soak the joints below
Give the sealant the cure time we tell you before anything rubs against it. Most exterior sealants skin fast but take longer to cure right through.
A joint that has stopped moving pushes the movement elsewhere, often as cracks near the joint. Catch it early and you reduce the risk.
External mastic in Kitts End, done properly
We’re ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Porous or awkward surfaces are primed where the sealant needs it, and we do not skip that step. We’re often asked to deal with joints with sealant missing in places and joints pointed up with cement by mistake, across façade panels, render & cladding joints and joints between brick and frames.
Working on the outside of a London home means planning access: shared paths, upper floors and parking. For a home in Kitts End, tell us how high the joints are and how to reach the back of the building.
The work is covered for a year after we finish. If anything isn’t right with it, ring 0345 464 0079 or email us.
- Place
- Kitts End (EN5)
- Region
- Greater London
- Guarantee
- A year, on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
What we do, step by step
Once we are on site, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. After that, the work takes a few hours to a few days, depending on the length of joint and the access. In Kitts End, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- We start by checking each joint, agreeing the ones to redo and how we’ll reach them.
- The old mastic and anything lodged in the joint is removed.
- We clean both faces of the joint and prime them where the product calls for it.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
How to prepare
- Plan for the work area to be out of bounds to pets and children
- Mention any sign-in or site rules at work premises
- Let us know if you’ve seen damp or leaks
Ask for a quote
To get a quote, phone 0345 464 0079 or drop us an email with the location and a short description of the problem. You will have a clear quote before work begins.
Advice
Should I try it myself first?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
The biggest DIY mistake is sealing over old sealant. New silicone won’t bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
Different surfaces, different methods
Joints between dissimilar materials
Where a frame or panel meets masonry, water often finds a way in. The old joint is removed and a sealant that bonds to both sides goes in.
Render joints
Render is weaker at the surface than brick, so a sealant that stretches easily protects the edges. Priming is done where the sealant calls for it.
Why act early in Kitts End
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. A stiffer product can damage the joint edge as it fails. In a flat in Kitts End, failed sealant seldom stays inside your own four walls: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the 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 drop us an email and we will give you an honest view and a quote.
What you get with us
- Any old sealant cut out fully, not covered over
- Anti-fungal sanitary silicone in wet areas
- Quality sealants from Arbo and Everbuild
- Colour picked to suit the job
Read what affects the cost or customer reviews.
Do you need external mastic in Kitts End?
Some movement joints have been pointed up with mortar, often by someone who didn’t know what it was for. The joint cannot move, so the wall cracks somewhere else instead.
The problems people generally mention when they call include:
- Weathered mastic that no longer stretches
- Failed seals between different materials
- Water getting into walls through failed joints
- Movement joints filled with mortar instead of sealant
For landlords with property near Hadley Wood station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Comparing quotes
- Are they insured?
- Who turns up on the day
- Which sealant they’ll use, and why
- How long to leave it before use
Also near Kitts End
Also in Kitts End
When it isn’t the sealant
We’d rather tell you now than do work that won’t last, so here’s what sealant can’t put right:
- Cracked brickwork or render that needs a builder or plasterer
- Cutting new joints into brickwork, which is building work rather than sealant work
- Damp that is not coming from the joint
Not sure which it is? You can call 0345 464 0079 or drop us an email and we will tell you honestly before you book.
Joints and surfaces we work on
- Concrete & block
- Copings & trims
- Render & cladding joints
- Joints between brick and frames
- Brickwork movement joints
- Façade panels
Common questions in Kitts End
Do you work for landlords with property near Hadley Wood station?
Yes. We work for letting agents and landlords as well as homeowners, and several properties can go on one quote. Just phone 0345 464 0079 or email us with the address and what needs doing, and we’ll give you a clear quote.
Is parking an issue for external mastic in Kitts End?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.
Do you work for hotels and businesses?
Yes. We’ve worked for hotels, offices and other businesses, and we are fully insured.
Do you work in Kitts End?
We do. Kitts End is part of the area we cover, and the service is the same as everywhere else.
Why do you put foam in the joint first?
We fit closed-cell backing rod wherever the joint depth needs controlling. It sets the sealant depth and prevents three-sided bonding so the bead can stretch.
How long does external mastic take?
Most jobs take a few hours to a few days, depending on the length of joint and the access, including the preparation. Your quote will say how long we expect yours to take.
Are you an approved applicator?
Yes. We’re ARBOMaster approved, the scheme for applicators of Arbo sealants.
Should I point up the gap in my brickwork?
No. Cement or mortar can’t stretch, so the joint stops doing its job. Where a joint has been mortared, it can often be raked out and sealed properly.
What external mastic looks like in Kitts End
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like Wyllyotts Manor (about 1.7 miles north) are a reminder that the area around Kitts End has older buildings as well as new. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
Managing a site like Monken Hadley CofE Primary School? Then larger buildings have long runs of movement joint that eventually need resealing. Kitts End is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Kitts End is about 2 miles south-west of Potters Bar, in Greater London. Across the EN5 area, we cover external mastic for homes and businesses. Our Greater London coverage runs to 764 places, Kitts End among them. You can also see our page for London, about 13 miles away.
Jobs for external mastic in EN5 works the same way as everywhere else we cover. If you’re just outside Kitts End, we cover Dancers Hill (1 mile north-west), Hadley (1 mile south), High Barnet (1 mile south), South Mimms (2 miles north-west) and Ridge (2 miles north-west). Further out, we also cover London (13 miles south), City of Westminster (11 miles south), Marylebone (11 miles south), Kensington (12 miles south), St Pancras (11 miles south) and Shoreditch (11 miles south-east).
What’s near Kitts End
Typical jobs here are in homes near King George's Fields (Monken Hadley), Former King William IV Public House and Susi Earnshaw Theatre School and the streets around them. For rail, the closest station is Hadley Wood station, about 1.1 miles east. A little further out are Spires Shopping Centre (1.2 miles south) and Potters Bar Museum (1.6 miles north). The countryside around Kitts End includes Hadley Green and Darland's Lake.