Surrey · England
Sand Mastic in St George's Hill
Our applicators work in St George's Hill on traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old material cut out, joints cleaned and sealed neatly.
- Failed mastic on an exposed elevation
- Patchy fillers round a sash window
- Open joints round the window box
Should I try it myself first?
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is.
Sand mastic in St George's Hill, done properly
Silicone on a period window often looks wrong and is not always the right material. Sand mastic is the traditional choice and we can swap the silicone for it. We are often asked to deal with cracked mastic round a front door frame and gaps between timber frames and stone or brick, on stone surrounds, timber door frames and sash and case windows.
Around St George's Hill, conservatories, garden rooms and patio doors are often part of the house. Their glazing joints and frame seals are as much a part of the job as the windows.
We guarantee the work for a year. If something isn’t right with it in that time, tell us and we’ll put it right.
- Place
- St George's Hill (KT13, KT11, KT12)
- Region
- Surrey
- Guarantee
- One year on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
What we do, step by step
We work through the job in order: protect, prepare, seal, tidy. For most jobs that takes a few hours for a single window, longer for several, and the area is left clean. For a job in St George's Hill, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- We check the window surrounds and agree which joints need renewing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Deep voids are packed so the mastic is the right thickness.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- We dress the surface so it sits neatly against the masonry.
Preparing for the visit
- Tell us about access, such as stairs, a lift or high-level joints
- Try not to wet indoor joints just before the visit
- Tell us about any water getting in
How to get a quote
Every job is quoted individually. Just ring 0345 464 0079 or drop us an email with the details, and photos are welcome.
Read more
Aftercare tips
How long the joints last depends on use and care. We suggest:
- Check with your local planning authority if your home is listed
- Leave the new mastic unpainted
- Check the mastic when you check the paintwork
- Do not run silicone over sand mastic
Look at the mastic when you look over the windows. Small cracks are easier to deal with early.
Gaps round a sash box let in draughts and rain. Left, the gap tends to get bigger.
St George's Hill: your questions answered
Can you help a landlord with a rental near Weybridge station?
Yes, we work for landlords and agents. Just phone 0345 464 0079 or email us and tell us about the property, and we’ll send you a clear quote.
Do you cover St George's Hill for sand mastic?
Yes, St George's Hill is within the area we cover. Our work covers London and the South East. Just ring 0345 464 0079 or email us with a few details of the job.
Do you work for hotels and businesses?
Yes. Larger jobs can be planned room by room or area by area.
Can you replace silicone on a period window with sand mastic?
Yes. The silicone is cut out and the joint cleaned, then point it with sand mastic.
Do you have insurance?
Yes. We’re fully insured.
Is sand mastic better than silicone for my windows?
For period timber windows in stone or brick, sand mastic is often the better fit. Modern frames normally suit a flexible sealant, and we’ll explain why.
Does someone need to be in?
For indoor joints, yes, someone needs to let us in. Once we have agreed the job, you do not need to watch us work.
Can I choose the sealant colour?
Most of the time, yes. We’ll tell you which colours the right product comes in and agree one before work begins.
Landlords, agents and businesses in St George's Hill
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.
In hotels, rooms out of use cost money, so the work can be planned room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
Leave it or put it right?
Replacing sash windows is a big decision for a period home, and in listed buildings it may need consent. Where the frames are in good order, new mastic seals the surround. In an older home around St George's Hill, damp from a failed joint can get into timber and plaster, and that is a much bigger job than renewing the sealant.
We do not show prices on the website, because each job is priced on what it involves. For a quick quote, please ring 0345 464 0079 or email us.
Why St George's Hill clients choose us
- Neat joints and a tidy finish
- Approved under the ARBOMaster scheme
- A 12-month guarantee on all work
- 180+ five-star Google reviews
What the job involves on each surface
Tenement and terrace windows
Where a building is shared, window work may involve neighbours so it’s worth checking responsibilities.
Stone surrounds
We take care not to mark the stone when the old mastic comes out.
Also near St George's Hill
More services for St George's Hill
St George's Hill homes and the weather
Historic houses like Byfleet Manor (about 2.2 miles south) are a reminder that the area around St George's Hill 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’s traditional sand mastic. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
In the older streets around United Reform Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. For landlords with property near Weybridge station, any sash windows need sound mastic to keep draughts and rain out. Managing a site like Manby Lodge Infant School? Then larger buildings have plenty of frames, and the mastic around each one ages.
St George's Hill is about 1 mile south of Weybridge, in Surrey. Every kind of property in St George's Hill is covered for sand mastic, old or new, large or small. The work is guaranteed for a year. St George's Hill is one of 395 places in Surrey we cover for sand mastic. For nearby work, see our London page.
All of KT13, KT11 and KT12 is within our area for sand mastic, from the main roads to the quietest streets. Sand mastic is available to properties on Cavendish Road, Holme Chase and Winterbourne Grove. Being close to the B372, St George's Hill is easy for our applicators to reach. Neighbouring places we cover for sand mastic include Weybridge (1 mile north), Brooklands (1 mile south-west), Whiteley Village (1 mile south-east), Burwood Park (1 mile east) and Byfleet (2 miles south-west). Within a short drive, we also cover Guildford (10 miles south-west), Woking (6 miles south-west), Camberley (12 miles west), Epsom (8 miles east), Redhill (15 miles south-east) and Ewell (8 miles east).
Local landmarks in St George's Hill
We work in homes and buildings around St George's College Weybridge, The Grotto pub and Heathside School and the streets around them. St George's Hill’s nearest station is Weybridge station, about 0.5 miles west of the centre. Nearby you’ll also find Elmbridge Museum (3.7 miles east) and No. 2 New Zealand General Hospital (2 miles north-east). For a walk, there’s St Ann's Hill and Ferris Meadow Lake.
What sealant work can’t fix
To be straight with you, there are a few things sealant will not fix:
- Decisions on consent for listed homes
- Damaged stone surrounds
- Sashes that rattle, stick or won’t open
Not sure which it is? You can ring 0345 464 0079 or email us and we’ll tell you honestly before you book.
What we seal
- Timber door frames
- Tenement windows
- Brick reveals
- Stone surrounds
- Period & listed homes
- Sash and case windows