Surrey · England
Sand Mastic in Keeper's Corner
Professional sand mastic in and around Keeper's Corner, with old sealant always removed completely and a 12-month guarantee.
- Old sand mastic that has cracked, crumbled or fallen out
- Silicone on a period window that looks wrong
- Cement or filler used on old window joints that has cracked
Leave it or put it right?
Not every draught comes from the sashes themselves. Open mastic joints round the box can let air in and new mastic seals them. In a small place like Keeper's Corner, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
What you pay reflects the work, not guesswork. That’s why we ask a few questions first.
What you get with us
- We leave the area clean and tidy
- Experience in homes, commercial sites and hotels
- We are fully insured
- 180+ five-star Google reviews
Read what affects the cost and our reviews.
Sand mastic in Keeper's Corner
A silicone bead around a sash window can look out of place and does not suit the building. Sand mastic gives a finish that matches the age of the house, and we can replace one with the other. If you have mastic that needs renewing before redecorating and draughts and rain around sash boxes, we can help.
Mastic can only go onto a dry, clean joint, so window work in Keeper's Corner is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
Big or small, you get the same 12-month guarantee in Keeper's Corner and across Surrey.
- Where
- Keeper's Corner (RH6, RH10)
- Wider area
- Surrey
- Guarantee
- One year on every job
- Quote
- A clear price before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
DIY sealant or a professional job?
If you’re set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
Questions from Keeper's Corner
Will you come out to Keeper's Corner?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Do you cover Keeper's Corner for sand mastic?
Yes. Our work covers London and the South East, and Keeper's Corner is part of that. You can call 0345 464 0079 or email us and tell us what needs doing, and we’ll send you a clear quote.
How much does sand mastic cost in Keeper's Corner?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
Will the old sealant be removed?
Yes. Sealing over the old bead is the commonest cause of early failure, and it’s something we never do.
Is sand mastic better than silicone for my windows?
Sand mastic normally suits period timber windows best. Modern frames normally suit a flexible sealant, and we will explain why.
What information do you need?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
How long does the job take?
As a guide, most jobs take anything from a few hours to a full day, depending on how many windows. Larger jobs naturally take longer, and we’ll tell you how long to expect.
I rent my home. Can I book you?
Yes, but check with your landlord or agent first. Many landlords are glad to have it sorted.
Also near Keeper's Corner
What else we do in Keeper's Corner
How we quote for sand mastic
You’ll get a clear quote before any work starts. It’s based on:
- Any working-time requirements on site
- The size of the job
- The old material and how stubborn it is
- Which sealant suits the joint
We do not show prices on the website, because each job is priced on what it involves. Call for a quick quote and we’ll talk you through it.
What we need to know
You don’t need to know the technical terms. It helps if you can tell us:
- How we’d reach the joints
- If someone has resealed it before
- The problem you’ve noticed
- The address or postcode of the job
There’s no standard price list, as no two jobs are quite the same. Instead, we give you a clear quote for your job. To arrange one, phone 0345 464 0079 or email us.
What we do, step by step
Once we’re on site, we check the joints match what you told us. If anything is different, we explain it before carrying on. Most jobs then take a few hours for a single window, longer for several. In a small place like Keeper's Corner, access is normally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We check the window surrounds and agree which joints need renewing.
- Old, loose mastic is raked out and the joint cleaned.
- Deep voids are packed so the mastic is the right thickness.
- The mastic is mixed, pressed into the joint by hand and shaped.
- We dress the surface so it sits neatly against the masonry.
Before we arrive
- Tell us about access, such as stairs, a lift or high-level joints
- For business premises, tell us about site rules or sign-in
- Clear items away from the joints we’re working on
How to get a quote
Quotes start with a quick conversation. 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, phone 0345 464 0079 or drop us an email.
Advice
Looking after it afterwards
No joint lasts for ever, but care makes a real difference. Our tips:
- Have rotten timber repaired before new mastic goes in
- Leave the new mastic unpainted
- Check with your local planning authority if your home is listed
- Look over the window mastic once a year
Keep paint scrapers and sanders off the mastic when redecorating. Hard scraping can loosen it.
Crumbling mastic lets rain into the joint. It can soak into the frame and the surrounding masonry, so renewing it early is worth it.
When it isn’t the sealant
Some problems need a builder, plumber or other trade rather than us:
- Damaged stone surrounds
- Decayed frames that need repair
- Cracked or broken glass
If you’re not sure, just phone 0345 464 0079 or email us and we’ll give you a straight answer.
What we seal
- Tenement windows
- Timber door frames
- Sash and case windows
- Period & listed homes
- Stone surrounds
- Brick reveals
Frames and glazing around Keeper's Corner
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Historic houses like Saint Hill Manor (about 4.8 miles south-east) are a reminder that the area around Keeper's Corner has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
In the older streets around Church of St Bartholomew, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. For landlords with property near Gatwick Airport station, older sash windows in a rental need their mastic kept sound to keep the weather out. For site and facilities teams at buildings such as Copthorne CofE Junior School, its window and door frames need their mastic kept sound, just like a home’s.
Keeper's Corner is about 3 miles south-east of Horley, in Surrey. For sand mastic in and around Keeper's Corner, please ring 0345 464 0079 or send us an email for a quick quote. We cover Surrey from our Crawley base. We cover 395 towns and villages across Surrey, large and small.
Our applicators cover all of RH6 and RH10 for sand mastic. That includes homes and businesses on Effingham Road and Redehall Road. Keeper's Corner sits on or near the B2037. Neighbouring places we cover for sand mastic include Burstow (1 mile west), Shipley Bridge (1 mile west), Copthorne (1 mile south-west), Fernhill (1 mile west) and Smallfield (1 mile north). Further out, we also cover Epsom (14 miles north-west), Horley (3 miles north-west), Redhill (6 miles north-west), Ewell (15 miles north-west), Reigate (7 miles north-west) and Caterham (9 miles north).
Local landmarks in Keeper's Corner
Typical jobs here are in homes near The Curious Pig in the Parlour pub and Oakwood School, among other places. For rail, the closest station is Gatwick Airport station, about 2.3 miles west of the centre. A little further out are Langley Green Hospital (3.9 miles west) and Effingham Park Motor Museum (1.1 miles south-east). Not far away are Hedgecourt Lake.
Different surfaces, different methods
Timber door frames
Door frames get knocked and soaked and the mastic can crack early. It’s renewed by hand.
Sash and case windows
Sash windows are where we do most sand mastic work. We renew the mastic round each box.