Windsor and Maidenhead · England
Sand mastic for sash & case windows in Dedworth, Windsor and Maidenhead
Sand mastic for Dedworth and the surrounding area: careful preparation, the right product and tidy work. Call for a quick quote.
- Mastic dropping out of the joint
- Old cement repairs round a window that have failed
- Gaps where the frame meets the masonry
Sand mastic in Dedworth, done properly
Traditional burnt sand mastic that sits naturally against stone and brick. It’s a good fit for period properties, where modern sealant can look out of place. If you have cracked mastic round a front door frame and wind and rain getting in round a sash window, we can put it right, on tenement windows, period & listed homes and timber door frames alike.
Houses in smaller places like Dedworth can stand more in the open than those in a built-up town. The mastic around frames on those walls tends to age faster.
The work is guaranteed for twelve months. If something is not right with it in that time, tell us and we’ll put it right.
- Location
- Dedworth (SL4)
- Region
- Windsor and Maidenhead
- Guarantee
- 12 months on all our work
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
DIY versus a professional finish
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
What sand mastic looks like in Dedworth
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like St Leonard's Hill (about 0.6 miles south) are a reminder that the area around Dedworth 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.
If you live in an older home near All Saints Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. For landlords with property near Windsor & Eton Central station, cracked sand mastic around sash windows lets in the draughts tenants complain about. If you look after a building such as Dedworth Green First School, the mastic around its windows and doors needs looking after like any other building’s.
Dedworth is about 1 mile west of Windsor, in Windsor and Maidenhead. For sand mastic in and around Dedworth, it’s easy to get a quote: please phone 0345 464 0079 or drop us an email. We cover Windsor and Maidenhead from our Crawley base. Across Windsor and Maidenhead, we cover 57 places, Dedworth among them. We also work in Reading, around 14 miles away.
Here we cover the SL4 postcode area for sand mastic. Sand mastic is available to properties on Ash Lane, Wolf Lane and Roses Lane. We also cover the places around Dedworth: Windsor (1 mile east), Oakley Green (1 mile west), Boveney (1 mile north), Clewer (1 mile north-east) and Water Oakley (1 mile north-west). We also work in nearby towns such as Maidenhead (5 miles north-west), Boyn Hill (5 miles north-west), North Ascot (5 miles south-west), Cookham (7 miles north-west), Furze Platt (6 miles north-west) and Broomhall (6 miles south). As one of the bigger places in Windsor and Maidenhead, Dedworth has homes, rented property and businesses of every kind.
Around Dedworth
In Dedworth, that means homes and buildings near Windsor Girls' School, Windsor Girls' School and The Greene Oak pub. The closest station to Dedworth is Windsor & Eton Central station, about 1.7 miles east of the centre. A little further out are Windsor Castle (1.9 miles east) and King Edward VII Hospital (1.5 miles east). Green spaces nearby include Bray Pit and Taplow Lake.
What the job involves on each surface
Brick reveals
We rake out the old mastic and pack deep voids before pointing.
Timber door frames
A neat sand mastic joint round a front door suits a period home.
Keeping the joints in good condition
Looking after new joints is easy, and it makes a real difference:
- Get any rot dealt with first
- Check the mastic when you check the paintwork
- Keep sills and gutters clear so water drains away
- Check with your local planning authority if your home is listed
Avoid sealing over the mastic with silicone. If anything cracks, get it looked at rather than patching it.
Small cracks are a sign the mastic is ageing. It’s easier to renew it before it drops out.
Dedworth: your questions answered
Will you come out to Dedworth?
Yes. Dedworth is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Is Dedworth in your area for sand mastic?
Yes, Dedworth is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or drop us an email with a few details of the job.
How do I get a quote for sand mastic in Dedworth?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. You will get a clear quote before we start.
Do I need permission for sand mastic on a listed building?
Your local planning authority is the one to ask. They decide whether consent is needed.
Can sand mastic be painted?
Traditional guidance is not to paint over sand mastic. If you are redecorating the window, ask us first and we’ll talk you through it.
Do you work for hotels and businesses?
Yes. We can plan bigger jobs in stages.
What do you need from me for a quote?
Let us know what needs doing and where, plus photos if you have them. We’ll ask anything else we need to know.
Do you work for landlords and businesses?
Yes, we do. Domestic, commercial and hotel work are all part of what we do, and we are fully insured.
What we cannot put right
Some problems need a builder, plumber or other trade rather than us:
- Decisions on consent for listed homes
- Sash cords, weights and draught-proofing of the sashes
- Masonry that needs repairing
If you’re not sure, just ring 0345 464 0079 or drop us an email and we’ll give you a straight answer.
Surfaces we seal
- Period & listed homes
- Sash and case windows
- Timber door frames
- Brick reveals
- Stone surrounds
- Tenement windows
Why it’s worth doing now in Dedworth
Gaps round a sash window let in rain and draughts. Left, water can reach the timber and the wall, so dealing with it now protects both. In a smaller place like Dedworth, wherever a wall is exposed, a failed outside joint is a real source of damp. Indoors, a failed seal lets water into floors and panels as it would anywhere.
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you are unsure, phone 0345 464 0079 or drop us an email and we will give you an honest view and a quote.
Why us?
- 20+ years of sealant experience
- Approved under the ARBOMaster scheme
- Rated 4.9 stars on Google
- One-year guarantee on every job
What affects the cost of sand mastic
Every job gets its own quote. These are the things that affect it:
- Whether the work is at height
- Which sealant suits the joint
- The old material and how stubborn it is
- The number of rooms or windows
We do not show prices on the website, because each job is priced on what it involves. For a quick quote, please phone 0345 464 0079 or send us an email and we’ll talk you through it.
Helping us quote
There’s no need for technical detail. It helps if you can tell us:
- If it’s domestic, commercial or a hotel
- Pictures of the joints, sent by email
- The problem you’ve noticed
- If someone has resealed it before
Want a quote for sand mastic? Please ring 0345 464 0079 or send us an email with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.
The process
There is not much for you to do on the day. Point us to the joints and we will get on with it. The work itself takes a few hours for a single window, longer for several from start to finish. For a job in Dedworth, 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.
- We rake out the old mastic and clean the joint.
- 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.
How to prepare
- For indoor joints, keep the area dry beforehand if you can
- Tell us about any water getting in
- For business premises, tell us about site rules or sign-in
How to get a quote
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 photos by email if you can.