Windsor and Maidenhead · England
Dorney Sand Mastic
Sand mastic across Dorney and nearby, with old sealant always removed completely and a 12-month guarantee.
- A silicone bead on a sash window that spoils the look
- Mastic dropping out of the joint
- Failed mastic on an exposed elevation
How we handle sand mastic in Dorney
Old sand mastic cracks, crumbles and falls out over time, leaving gaps round the window. We rake it out and renew it and tidies the surround. We work on brick reveals, timber door frames and stone surrounds, and common reasons people get in touch are silicone on a period window that looks wrong and gaps round a timber door in stone or brick.
Around Dorney, many homes face open ground, so their windows and doors take the full weather. Exposed frames and sills lose their mastic sooner than sheltered ones.
There’s a 12-month guarantee on every job.
- Location
- Dorney (SL4)
- Region
- Windsor and Maidenhead
- Cover
- One year on every job
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
What we cannot put right
New sealant can’t fix everything, and we’d rather say so up front. Sealant won’t put right:
- Rotten sashes, sills or window boxes (a joiner’s job)
- Putty and glazing repairs
- Crumbling stone or brickwork round the window
If you’re not sure, just ring 0345 464 0079 or email us and we’ll give you a straight answer.
Surfaces we seal
- Brick reveals
- Stone surrounds
- Sash and case windows
- Tenement windows
- Period & listed homes
- Timber door frames
Nearby places to Dorney
More services for Dorney
Dorney: your questions answered
Do you cover smaller places like Dorney?
Yes. Dorney is within the area we cover, which takes in towns, villages and rural addresses. 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 Dorney for sand mastic?
Yes, Dorney is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or email us and tell us what needs doing, and we’ll send you a clear quote.
What’s sand mastic made of?
Sand mastic is a traditional material for pointing round windows and doors. It’s made with sand and a linseed-oil-based binder.
Will there be a smell?
Sometimes, a little. Any smell clears as the sealant cures, and ventilation helps.
Is it OK to seal over old sealant?
No, and we never do. It may look fine at first, but the new layer lifts away from the old one. The old sealant has to come out completely.
Can you replace silicone on a period window with sand mastic?
Yes, it’s a common request. The old silicone has to come out completely so the mastic can sit properly.
Do you take out the old sealant first?
Yes, every time. New silicone doesn’t stick to old silicone, so the joint is cleaned back first.
Can I add another job to the visit?
Yes. Several rooms, windows or areas can go on one quote.
Can I do it myself?
The biggest DIY mistake is sealing over old sealant. New silicone won’t bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Frames and glazing around Dorney
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Historic houses like Dorney Court (about 0.5 miles west) are a reminder that the area around Dorney has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
For an older house near a landmark such as Church of St James, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. If you look after a building such as Western House Academy, larger buildings have plenty of frames, and the mastic around each one ages. For landlords with property near Burnham station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Dorney is about 2 miles north-west of Windsor, in Windsor and Maidenhead. Wherever you are in the SL4 postcode area, we can carry out sand mastic at your property. Across Windsor and Maidenhead, we cover 57 places, Dorney among them. There’s also a page for Reading, about 14 miles away.
All of SL4 is within our area for sand mastic, from the main roads to the quietest streets. Sand mastic is available to properties on Common Road, Village Road and Boveney Road and the roads around them. Other places close to Dorney include Lake End (1 mile north-west), Dorney Reach (1 mile west), Cippenham (1 mile north-east), Huntercombe (1 mile north) and Bray (2 miles west). Further out, we also cover Maidenhead (4 miles west), Boyn Hill (4 miles west), North Ascot (6 miles south), Cookham (5 miles north-west), Furze Platt (4 miles north-west) and Broomhall (8 miles south).
Local landmarks in Dorney
Around Dorney, our work takes us to homes and buildings near The Westgate School, Sutherland Grange and Westgate School and the streets around them. Dorney’s nearest station is Burnham station, roughly 1.4 miles north. Other landmarks nearby include Upton Hospital (2.7 miles east) and The History On Wheels Museum (1.2 miles east). Open spaces near Dorney include Bray Pit and Taplow Lake.
Aftercare tips
To keep the joints looking good and working properly:
- Leave the new mastic unpainted
- Avoid heavy scraping on the mastic joint
- Inspect the joints round the windows every year or so
- Ask a joiner to look at soft timber first
Keep gutters and sills clear so water runs away from the surround. Constant wetting wears the mastic faster.
Small cracks are a sign the mastic is ageing. Renewing it then is simpler than waiting until it falls out.
Why act early in Dorney
Silicone might seem the quicker option, but on period stone or brick it often looks out of place. Sand mastic is the traditional material and finishes neatly against the masonry. Where a wall is exposed, as many are in small places like Dorney, 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 guesswork. That’s why we ask about the job first and agree the price before starting.
Why Dorney customers choose us
- More than 20 years in sealant work
- Every job guaranteed for a year
- Domestic, commercial and hotel work
- Neat joints and a tidy finish
See what affects the cost and customer reviews.
What we do, step by step
The work is kept neat and contained to the joints we’re treating, so you can get on with your day. The job usually takes a few hours per window, depending on the condition of the joints, and we tell you how long to leave it before we go. In a small place like Dorney, access is usually the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- Each surround is checked first.
- We rake out the old mastic and clean the joint.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
Before we arrive
- Tell us if parking is tricky
- Keep pets and children clear of the area while we work
- On commercial sites, let us know about site rules
Get a quote
If you are in Dorney and need sand mastic, phone 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and you’ll get a clear quote before we start.
Related advice
For landlords and businesses
Housing providers, facilities teams and property managers book us too in Dorney and across Windsor and Maidenhead. Several sites can go on one quote.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
What affects the cost of sand mastic
Some jobs are bigger than they look, and some smaller. What affects the quote:
- Whether old sealant or filler has to be cut out
- The product the joint needs
- Any working-time requirements on site
- Mould in or behind the old joints
Combining jobs into one visit normally makes better use of the time than several visits. We’ll send you a clear quote for the lot.
Helping us quote
Before you ask for a quote, have a think about:
- Where the property is
- The rough size of the job
- Any access issues, like height or stairs
- What the problem is, such as mould, gaps, leaks or cracking
Need a quote? Please ring 0345 464 0079 or send us an email with a few details. We will explain what we’d do and send you a clear quote before work begins.