Surrey · England
Betchworth External Mastic
Problem with your movement joints in Betchworth? We cut out the old, prepare the joints and apply the right sealant.
- Movement joints filled with mortar instead of sealant
- Joints with sealant missing in places
- Plants rooting in failed movement joints
External mastic in Betchworth
On houses, flats and commercial buildings across Betchworth, we reseal joints in brickwork, render, cladding and façade panels. The preparation is the same whatever the wall: clean, sound faces and a controlled depth. We’re often asked to deal with joints with sealant missing in places and water getting into walls through failed joints, across concrete & block, copings & trims and façade panels.
In a village or hamlet like Betchworth, older cottages and farm buildings often stand in the open, so walls and rooflines take the full force of wind and rain. Gutter joints and wall joints there need a sealant that can flex and stay put.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Place
- Betchworth (RH3)
- Region
- Surrey
- Guarantee
- A year, on every job
- Quote
- A clear price before work begins
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Honest limits
A few problems are outside what sealant work can do:
- Cutting new joints into brickwork, which is building work rather than sealant work
- Movement that’s more than a sealant joint can take
- Loose or hollow render, which needs re-rendering
Not sure which it is? You can call 0345 464 0079 or email us and we will tell you honestly before booking.
Joints and surfaces we work on
- Render & cladding joints
- Façade panels
- Brickwork movement joints
- Concrete & block
- Copings & trims
- Joints between brick and frames
Leave it or put it right?
A failed movement joint lets water into the wall, behind render and cladding. Dealing with it early keeps the repair to the joint, instead of the wall and finishes around it. Where a wall is exposed, as many are in small places like Betchworth, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
A failed joint rarely gets cheaper to fix by waiting, because water and mould keep working on it. If you’re unsure, ring 0345 464 0079 or send us an email for an honest opinion and a quote.
What you get with us
- White, clear, grey or another colour, product permitting
- We never seal over old sealant
- We leave the area clean and tidy
- Full insurance on every job
Take a look at how sealant jobs are priced and customer reviews.
What we do, step by step
Our applicators work methodically: protect, prepare, seal, tidy. Typically it takes anything from a few hours to several days, depending on the building and we leave things clean and tidy. Somewhere like Betchworth needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- The old mastic and anything lodged in the joint is removed.
- The joint faces are cleaned and primed where the sealant needs it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Preparing for the visit
- Let us know if you’ve seen damp or leaks
- For indoor joints, keep the area dry beforehand if you can
- Let us know about stairs, lifts or work at height
Getting a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and email pictures if that’s easy.
Read more
Can I do it myself?
A DIY attempt doesn’t rule out a professional job. We cut it out and start again, so tell us about it when you ask for a quote.
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
External mastic in Betchworth: local notes
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Polesden Lacey (about 4.7 miles west) are a reminder that the area around Betchworth 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.
For landlords with property near Betchworth station, failed wall and movement joints let damp in, so they’re worth checking between tenancies. In the older streets around Church of St Michael, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Betchworth is about 3 miles east of Dorking, in Surrey. We provide external mastic to homeowners, landlords and businesses in Betchworth. Betchworth is one of 395 places in Surrey where we work. We also work in Crawley, around 10 miles away.
We work across RH3 for external mastic. External mastic is available to properties on The Street, Station Road and Old Reigate Road and the roads around them. Neighbouring places we cover for external mastic include Buckland (1 mile east), Brockham (1 mile south-west), Box Hill (1 mile north-west), Strood Green (1 mile south-west) and Dawesgreen (2 miles south). Within a short drive, we also cover Guildford (13 miles west), Woking (14 miles west), Epsom (7 miles north), Horley (6 miles south-east), Redhill (4 miles east) and Ewell (8 miles north).
Local landmarks in Betchworth
Typical jobs here are in homes near The Red Lion pub and Brockham Limeworks and the streets around them. For rail, the closest station is Betchworth station, about 0.5 miles north. Well-known places in the area include Reigate Priory Museum (2.7 miles east) and Headley Court (3.6 miles north). The countryside around Betchworth includes Reigate Heath and Box Hill.
Nearby places to Betchworth
More services for Betchworth
Different surfaces, different methods
Brickwork movement joints
Brick moves with heat and moisture, and grows a little over time. The movement joint takes that up, so its sealant has to stay flexible.
Render joints
Rendered walls have joints at beads, openings and changes of material. They’re resealed in a sealant that suits the render.
Betchworth questions
Is Betchworth in your area for external mastic?
Yes. We work across London and the South East, and Betchworth is part of that. You can call 0345 464 0079 or send us an email and let us know what needs doing.
Will you come out to Betchworth?
Yes, Betchworth is covered. We work across London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Do you work for letting agents?
Yes. As well as householders, we work for landlords, agents, businesses and hotels in Betchworth.
Can you seal joints between render and window frames?
Yes. Where different materials meet is one of the most common joints we seal. The sealant is chosen to bond to both sides.
Can you work on commercial sites?
Yes. We work in offices, washrooms, hotels and other commercial premises. We can talk about working times when we quote.
Which products do you use?
Quality sealants from brands including Arbo and Everbuild, chosen to suit the joint. We explain the product when we quote.
Can I add another job to the visit?
Yes. Tell us about everything you’d like done and we will quote it together.
Does someone need to be in?
We need access to the joints, so we’ll agree that with you when we book. For inside work, that normally means someone being in.
Work for landlords, hotels and businesses
Hotels need rooms back in use, so we plan the work room by room. We have worked in hotels as well as homes and businesses.
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we’ll give you a quote.
Signs you need external mastic in Betchworth
Sometimes a movement joint was filled with mortar or a rigid filler by mistake. With the joint locked solid, the movement turns into cracks elsewhere in the wall.
Keep an eye out for any of the following:
- Cracked joints where brick meets render or frames
- Rigid filler in a joint that should flex
- Sealant that has lost its bond to the brick or render
- Leaking joints around cladding and façade panels
For site and facilities teams at buildings such as North Downs Primary School, larger buildings have long runs of movement joint that eventually need resealing.
Comparing quotes
- Which sealant they’ll use, and why
- Whether they seal over old material or remove it
- The length of the guarantee
- How long to leave it before use