Greater London · England
External & façade joints in Raynes Park, Greater London
Specialist external mastic for Raynes Park: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Weathered mastic that no longer stretches
- Failed seals between different materials
- Water getting into walls through failed joints
For landlords and businesses
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance.
For anyone letting property in or around Raynes Park, several properties can go on one quote. Just tell us the addresses and what each one needs, and pictures by email help.
About our external mastic in Raynes Park
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. If you have brick movement joints where the sealant has split and cracked joints where brick meets render or frames, we can help, on brickwork movement joints, render & cladding joints and concrete & block alike.
Newer London blocks are built with movement joints in brick and render, and with cladding joints sealed with mastic. Older terraces have their own weak points: gutter joints, roofline trims and the joint where an extension meets the original wall.
You’re covered for a year from the day we finish. If there’s a problem with it, please ring 0345 464 0079 or email us.
- Where
- Raynes Park (SW20, KT3, SM4)
- Region
- Greater London
- Guarantee
- A year, on every job
- Price
- A clear price before work begins
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
What we cannot put right
Honest advice matters more to us than a booking, so here’s what sealant cannot fix:
- Render that is blown, hollow or coming away
- Cutting new joints into brickwork, which is building work rather than sealant work
- Damp that is not coming from the joint
If you’re not sure, just call 0345 464 0079 or send us an email and we’ll give you a straight answer before booking.
What we seal
- Concrete & block
- Copings & trims
- Joints between brick and frames
- Brickwork movement joints
- Façade panels
- Render & cladding joints
Raynes Park questions
Is Raynes Park in your area for external mastic?
Yes, Raynes Park is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or email us and tell us what needs doing, and we will send you a clear quote.
I let a flat near Raynes Park station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. You can phone 0345 464 0079 or email us with the details for a clear quote.
When will the joints need doing again?
That varies with the weather the wall faces, how much it moves and the sealant used. Treat it as a maintenance item and look at it yearly and reseal when it splits.
How long should I leave it?
Cure times vary by product. We tell you how long to leave it before we go.
Can you quote for more than one area?
Yes, we can. Several rooms, windows or areas can go on one quote.
Which products do you use?
It depends on the joint: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Is the work guaranteed?
Yes. There’s a 12-month guarantee on every job.
How long does the job take?
It depends on the size of the job, but most jobs take anything from a few hours to several days, depending on the building. We will tell you when we quote.
DIY sealant or a professional job?
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
If you’ve already had a go yourself, that’s fine. We cut it out and start again.
What we’re called out for in Raynes Park
Some movement joints have been pointed up with mortar by mistake. With the joint locked solid, the movement turns into cracks elsewhere in the wall.
It’s worth asking for a quote if you see:
- Old sealant gone brittle and cracked
- Water getting into walls through failed joints
- Movement joints filled with mortar instead of sealant
- Joints where the bead has come unstuck
For site and facilities teams at buildings such as West Wimbledon Primary School, its movement joints, gutters and trims need looking after like any other building’s.
What to look for in a quote
- Whether you can choose the colour
- Which sealant they’ll use, and why
- What preparation is included
- Whether they’re fully insured
How to look after the new joints
Looking after new joints is easy:
- Keep movement joints as flexible joints, not mortar
- Fix overflowing gutters above sealed joints
- Check external joints each spring
- Act on the first splits you see
If you have more work done on the wall, such as new render, cladding or an opening, show the contractor the movement joints. They must stay as flexible joints, never rendered or pointed over.
Act while the splits are small. At that stage it’s a simple cut out and reseal with no damage behind it to deal with.
What we do, step by step
You do not need to clear the whole room or building, only the area right around the joints. Everything nearby is protected, and the work takes anything from a few hours to several days, depending on the building in most cases. In Raynes Park, flats, stairs and shared entrances are part of the routine. If the building has a concierge, managing agent or access rules, tell us when you book.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Getting ready for the visit
- Try not to wet indoor joints just before the visit
- Tell us about any water getting in
- Tell us about any previous sealing or DIY attempts
Get a quote
For a quick quote, get us on the phone, or email us if that is easier. Tell us about the joints that need doing and we’ll explain what’s involved before giving you a price.
Related advice
Places near Raynes Park
What else we do in Raynes Park
Raynes Park buildings and the weather
With historic houses such as Southside House (about 0.9 miles north) nearby, there’s older building stock in the area around Raynes Park as well as newer homes. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth. In terraces and conversions, gutters and walls are often shared with the neighbours, so check who is responsible for the outside before booking.
For landlords with property near Raynes Park station, failed wall and movement joints let damp in, so they’re worth checking between tenancies. Homes close to St Saviour's Church include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Raynes Park is about 2 miles south-west of Wimbledon, in Greater London. If you need external mastic in Raynes Park, it’s easy to get a quote: please call 0345 464 0079 or send us an email. We are based in Crawley and cover Greater London. Across Greater London, we cover 764 places, Raynes Park among them. We also work in London, about 9 miles from Raynes Park.
We work across the SW20, KT3 and SM4 postcode area for external mastic and the streets around it. That includes homes and businesses on Gore Road, Edna Road and Wyke Road. Being close to the A238 and A298, Raynes Park is simple for us to get to for external mastic. Other places close to Raynes Park include West Barnes (1 mile south-west), Bushey Mead (1 mile north-east), Cannon Hill (1 mile east), Motspur Park (1 mile north-west) and Wimbledon Chase (1 mile north-east). Further out, we also cover London (9 miles north-east), City of Westminster (8 miles north-east), Marylebone (9 miles north-east), Kensington (7 miles north), St Pancras (10 miles north-east) and Shoreditch (11 miles north-east).
Near you in Raynes Park
Typical jobs here are in homes near Raynes Park High School, The Raynes Park Tavern and Cannon Hill Common and the streets around them. There’s a railway station in Raynes Park itself: Raynes Park station. Nearby you will also find Wimbledon Museum (1.5 miles north-east) and Atkinson Morley Hospital (1 mile north). Green spaces nearby include Henman Hill and Derwent Floodwash.
How we quote for external mastic
The quote reflects the job in front of us. We look at:
- When we can work, for business premises
- The old material and how stubborn it is
- The number and length of the joints
- Whether there’s mould to deal with
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
Helping us quote
To help us quote quickly, please include:
- Any previous sealing or DIY work
- Where the job is, and your postcode
- The problem you’ve noticed
- Photos by email, if that is easy
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and add photos by email if you can.