Surrey · England
Sand mastic for sash & case windows in Capel, Surrey
Sand mastic in Capel from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Patchy fillers round a sash window
- Gaps where the frame meets the masonry
- Mastic dropping out of the joint
Sand mastic in Capel, done properly
Sand mastic is the traditional way to point the gap between a timber window frame and the stone or brick around it. It’s a mix of sand and a linseed-oil-based binder and built up by hand. On period homes, it looks right where silicone wouldn’t. We are often asked to deal with tired mastic found when preparing windows for paint and old cement repairs round a window that have failed, on sash and case windows, period & listed homes and stone surrounds.
In a village or hamlet like Capel, older cottages and farmhouses often have timber windows set in stone or brick. Older buildings like these don’t always suit modern silicone, and sometimes a traditional sand mastic is the better choice.
There’s a 12-month guarantee on every job, large or small.
- Location
- Capel (RH5)
- Wider area
- Surrey
- Cover
- One year on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
DIY versus a professional finish
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
If you’ve already had a go yourself, that’s fine. We cut it out and start again, so just mention it when you contact us.
Landlords, agents and businesses in Capel
In hotels, rooms out of use cost money, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. We can quote for more than one property at once.
Do you need sand mastic in Capel?
Water gets into small cracks in the mastic and loosens it further. Exposed elevations normally fail first.
These are the problems we are asked about most:
- Silicone on a period window that looks wrong
- Gaps between timber frames and stone or brick
- Mastic worn away on windows facing the weather
- Gaps round a timber door in stone or brick
For landlords with property near Ockley station, any sash windows need sound mastic to keep draughts and rain out.
What your quote should include
- What happens if they find a problem under the old sealant
- How long the guarantee is
- Whether they’re fully insured
- What product goes in the joint
Sand mastic in Capel: local notes
The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Managing a site like Scott Broadwood CofE Infant School? Then larger buildings have plenty of frames, and the mastic around each one ages. For an older house near a landmark such as Church of St John the Baptist, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Capel is about 5 miles south of Dorking, in Surrey. Jobs in Capel get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Capel is one of 395 towns and villages in Surrey where we work for sand mastic. Crawley is on our list too, around 6 miles away.
Here we cover the RH5 postcode area for sand mastic. Sand mastic is available to properties on The Street, Laundry Way and Bakers Way and the roads around them. If you are just outside Capel, we cover Ockley (2 miles west), Beare Green (2 miles north), Paynes Green (2 miles south-west), Kingsfold (2 miles south) and Holmwood Corner (3 miles north). Larger places within reach include Guildford (13 miles north-west), Epsom (13 miles north), Horley (7 miles east), Redhill (9 miles north-east), Ewell (14 miles north) and Reigate (8 miles north-east).
Local landmarks in Capel
The closest station to Capel is Ockley station, roughly 0.6 miles west of the centre. Other landmarks nearby include Horsham Hospital (5.6 miles south). For a walk, there’s Leith Hill and Warnham LNR.
Why deal with it now?
Draughts round a sash window are not always the sashes. Open mastic joints round the box can let air in, and renewing the mastic closes them. Where a wall is exposed, as many are in small places like Capel, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
What you pay reflects the work, not a rough estimate. That’s why we ask about the job first.
Why Capel customers choose us
- Tidy, careful work
- Full insurance on every job
- Trusted Arbo and Everbuild sealants
- Anti-fungal silicone where joints get wet
Aftercare tips
How long the joints last depends on use and care. Here’s what we suggest:
- Clear gutters so water does not pour onto the windows
- Inspect the joints round the windows every year or so
- Ask a joiner to look at soft timber first
- Renew mastic before redecorating the windows
Leave the new mastic unpainted, which is the traditional advice. Ask us before any decorating around it.
It’s best to renew mastic before painting the windows. Paint over cracked mastic only covers it up.
Also in Capel
Capel: your questions answered
Do you cover smaller places like Capel?
Yes, Capel is covered. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
I let a flat near Ockley station. Can you help?
Yes. We work for landlords and agents as well as householders. You can ring 0345 464 0079 or send us an email with the details for a clear quote.
How long does sand mastic take to harden?
It takes a while. It skins first and hardens fully later, and we will tell you what to expect.
Will the old sealant be removed?
Yes. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
Do you offer different sealant colours?
Normally, yes. Sealants come in white, clear, grey and other colours, and we agree the colour with you before we start.
Do the sealants smell?
Some sealants have a smell while they cure, but it fades. Opening a window helps.
What’s sand mastic made of?
Sand mastic is a traditional material for pointing round windows and doors. It combines sand with a linseed-oil-based binder.
Can new sealant go over the old?
No. New silicone will not bond to old silicone, and it traps any mould or water underneath. It all has to come out first.
Different surfaces, different methods
Tenement and terrace windows
Upper-floor windows need access planning. Tell us the height and we will confirm what’s needed.
Timber door frames
Sand mastic is used round timber door frames too. The method is the same as for windows.
How the visit works
At the end, we look at the finished work together and explain the cure time. The work normally takes anything from a few hours to a full day, depending on how many windows, depending on the size of the job. Somewhere like Capel needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- We check the window surrounds and agree which joints need renewing.
- We rake out the old mastic and clean the joint.
- We pack any deep gaps so the mastic sits at the right depth.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- We dress the surface so it sits neatly against the masonry.
Before we arrive
- Move anything stored near the joints
- Tell us about any water getting in
- Tell us about access, such as stairs, a lift or high-level joints
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.