Surrey · England
External Mastic in East Horsley
Professional external mastic in and around East Horsley, with every bit of old sealant taken out first.
- Movement joints filled with mortar instead of sealant
- Weeds or debris growing in open joints
- Brick movement joints where the sealant has split
For landlords and businesses
Landlords and letting agents in East Horsley can book us as well as homeowners. Resealing between tenancies keeps a property looking cared for before the next move-in.
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.
External mastic for homes and businesses in East Horsley
Joints in render and cladding are easy to overlook until a damp patch appears. We inspect them, agree which need doing and reseal with a weatherproof, flexible sealant in a matching colour. We work on render & cladding joints, concrete & block and joints between brick and frames, and the jobs we see most are sealant pulling away from one side of the joint and moss and dirt in joints with no sealant left.
Around East Horsley, garages, outbuildings and extensions all add to the joints on the outside of a home. Leaks usually start at a gutter end, a garage door frame or where an extension meets the house.
You’re covered for a year from the day we finish. If anything is not right with it, call 0345 464 0079 or email us.
- Where
- East Horsley (KT24, KT11)
- Wider area
- Surrey
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Questions from East Horsley
I let a flat near Horsley station. Can you help?
Yes, landlords and agents are among the people we work for. Just ring 0345 464 0079 or drop us an email with the address and what needs doing, and we will give you a clear quote.
Will you come out to East Horsley?
Yes, East Horsley is covered. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Do you do commercial work?
Yes. We work in offices, washrooms, hotels and other commercial premises, as well as homes. We can talk about working times when we quote.
Does someone need to be in?
It depends on the job. Inside work needs someone to give us access.
What sealant do you use?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. We use products from Arbo and Everbuild.
Why is there a gap in my brick wall?
A movement joint is a planned break in the wall that absorbs expansion and shrinkage. It’s sealed with a flexible sealant, not mortar.
Is it messy?
No. The area is protected while we work and cleaned up afterwards.
Should I try DIY first?
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.
Looking after it afterwards
Aftercare is simple:
- Check external joints each spring
- Tell anyone working on the walls about the movement joints
- Have failed joints looked at early
- Don’t let climbing plants root in the sealant
Don’t let soil, plants or ivy build up against the new joints. Anything that holds water against the joint wears it out sooner.
A joint that has stopped moving pushes the movement elsewhere, usually as cracking in the brickwork or render nearby. Resealing it early helps prevent that.
Honest limits
Honest advice matters more to us than a booking, so here’s what new sealant will not do:
- Movement that’s more than a sealant joint can take
- Cracking across the wall rather than at a joint
- Render that is blown, hollow or coming away
If in doubt, phone 0345 464 0079 or send us an email and we will say what we think before booking.
What we seal
- Façade panels
- Copings & trims
- Render & cladding joints
- Concrete & block
- Joints between brick and frames
- Brickwork movement joints
Also near East Horsley
Also in East Horsley
East Horsley buildings and the weather
Historic houses like Hatchlands Park (about 2.3 miles south-west) are a reminder that the area around East Horsley 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. The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you live in an older home near Church of St Martin, older walls, gutters and the joints where extensions meet them need a flexible sealant. Letting a property close to Horsley station? Then outside joints that have cracked can let damp into a rental, so check them between lets.
East Horsley is about 5 miles west of Leatherhead, in Surrey. If you need external mastic in East Horsley, please call 0345 464 0079 or email us for a quick quote. We’re based in Crawley and cover Surrey, East Horsley included. Across Surrey, we cover 395 places, and East Horsley is one of them. Crawley is on our list too, about 16 miles from East Horsley.
All of KT24 and KT11 is covered for external mastic. Whether your property is on Glendene Avenue, Cobham Way and High Park Avenue or anywhere close by, we can help. We also cover West Horsley (1 mile west), Effingham (1 mile east), Ockham (2 miles north-west), East Clandon (3 miles south-west) and Ripley (3 miles north-west). Further out, we also cover Guildford (7 miles west), Woking (7 miles north-west), Camberley (13 miles west), Epsom (8 miles north-east), Horley (13 miles south-east) and Redhill (12 miles east).
What’s near East Horsley
We work in homes and buildings around Howard of Effingham School, The Forest and the Highlands and Duke Of Wellington Public House and the streets around them. There’s a railway station in East Horsley itself: Horsley station. Nearby you’ll also find Send and Ripley History Society Museum (3.2 miles north-west). Green spaces nearby include Papercourt Marshes and Boldermere Lake.
How it works
Our applicators work methodically: protect, prepare, seal, tidy. For most jobs that takes a few hours for a handful of joints, longer for a whole elevation. Parking around East Horsley is usually easier than in a town centre, but mention any lanes, gates or long drives. For outside work, side access and the height of the joints help us plan.
- First, the joints are inspected and the access agreed.
- We cut out the old mastic and rake out anything in the joint.
- The faces are brushed clean and primed where the product requires it.
- We fit closed-cell backing rod to control the depth.
- We apply the sealant, tool it and check the whole run.
How to prepare
- Clear items away from the joints we are working on
- Tell us about any water getting in
- Keep children and pets away from the work area
How to get a quote
It all starts with a short chat. Describe the problem, the location and the size of the job, and we’ll talk you through what we’d do. Whenever you are ready, ring 0345 464 0079 or drop us an email.
Related advice
Surface by surface
Copings and trims
A failed coping joint lets water into the top of the wall. Resealing them is a small job that protects a lot.
Concrete and blockwork
Wide joints in concrete need the depth controlling carefully. We size the backing rod to the gap.
What affects the cost of external mastic
Some jobs are bigger than they look, and some smaller. What affects the quote:
- Any mould that needs treating
- The old material and how stubborn it is
- Whether the work is at height
- How many rooms, windows or areas are involved
Combining jobs into one visit usually makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. We’ll give you a clear quote for the lot.
Helping us quote
Photos by email are helpful but not essential. Try to tell us:
- Whether it’s a home or a business
- How we’d reach the joints
- Where the job is, and your postcode
- Whether it has been sealed before
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and add pictures by email if you can.
Signs you need external mastic in East Horsley
Using the wrong sealant is another common reason. A stiff, general-purpose sealant can’t cope with a joint that moves a lot, so it pulls away from the edges.
Most people get in touch when they notice one of these:
- Panel joints letting water in
- Moss and dirt in joints with no sealant left
- Damp patches traced to an open external joint
- Joints where the bead has come unstuck
Schools such as The Raleigh School are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Before you book anyone
- How the surfaces are prepared before sealing
- Are they insured?
- How hidden problems are handled
- Who turns up on the day