Windsor and Maidenhead · England
Maidenhead Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for householders, landlords and businesses in Maidenhead. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Weathered mastic on the most exposed windows
- Patchy fillers round a sash window
- Old sand mastic that has cracked, crumbled or fallen out
Sand mastic in Maidenhead
Our applicators renew the sand mastic around sash and case windows and doors set in stone or brick. The old mastic is raked out, the joint is prepared and new mastic is shaped by hand. If you’re dealing with mastic round period door frames that has failed and patchy fillers round a sash window, we can help.
Around Maidenhead, many houses have gained conservatories, French doors or replacement windows over time. Each one adds more joints to look after, and those joints age at different rates. Leaks normally start at a sill, a frame head or a glazing joint.
You are covered for a year from the day we finish. If anything is not right with it, ring 0345 464 0079 or send us an email.
- Place
- Maidenhead (SL6)
- Wider area
- Windsor and Maidenhead
- Cover
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
What the job involves on each surface
Brick reveals
Gaps between frame and brick let in rain and draughts. New mastic seals the gap.
Timber door frames
Sand mastic is used round timber door frames too. We renew it the same way as on windows.
What affects the quote in Maidenhead
We don’t publish a price list, because no two jobs are the same. The quote depends on:
- The number of rooms or windows
- Mould in or behind the old joints
- Access and height
- The type of sealant required
What you pay reflects the work, not guesswork. That is why we ask a few questions first and agree the price before starting.
Asking for a quote
Photos by email are helpful but not essential. Try to tell us:
- Roughly how big the job is
- How we’d reach the joints
- Pictures of the joints, sent by email
- Whether it’s a home or a business
Every job is quoted individually, so the first step is telling us about yours. Just phone 0345 464 0079 or send us an email with the details.
FAQs for Maidenhead
Is there a guarantee on sand mastic in Maidenhead?
All our work, in Maidenhead and everywhere else, comes with a 12-month guarantee. We are also fully insured and ARBOMaster approved.
Do you work for landlords with property near Maidenhead station?
Yes, landlords and agents are among the people we work for. Just ring 0345 464 0079 or send us an email with the address and what needs doing, and we will give you a clear price.
Is it possible to take out silicone and use sand mastic instead?
In most cases. The silicone is cut out and the joint cleaned, then point it with sand mastic.
Are you fully insured?
Yes. Mr Mastic is fully insured, and we’ve been doing sealant work for more than 20 years.
What is sand mastic?
It’s sand mixed with a linseed-oil-based binder, used between timber frames and stone or brick.
Do you come to Maidenhead?
Yes. From our base in Crawley, we cover South East England, London and all of Scotland, Maidenhead included.
Do the sealants smell?
Some sealants have a smell while they cure, but it fades. Ventilation helps.
Can I do it myself?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Looking after it afterwards
Good habits help new joints last longer. A few tips:
- Plan mastic work ahead of painting
- Find out about consent before window work on a listed home
- Take care around the mastic when scraping paint
- Do not run silicone over sand mastic
Make sure water drains away from the window surround. Constant wetting wears the mastic faster.
Sound mastic protects the frame. Once it fails, water can sit against the timber and timber that stays wet can rot.
DIY sealant or a professional job?
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is.
How it works
The work is kept neat and contained to the joints we are treating, so you can get on with your day. Expect the work to take a few hours for a single window, longer for several, and we explain the cure time before we leave. A visit in Maidenhead needs access to the work and a place to park close by. For outside work, let us know about side access, gates and any upper-floor joints.
- We start by checking each surround and agreeing the joints to renew.
- Old, loose mastic is raked out and the joint cleaned.
- 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.
- The finish is dressed so it sits neatly against the stone or brick.
Getting ready for the visit
- Try not to wet indoor joints just before the visit
- Let us know if you’ve seen damp or leaks
- Tell us if parking is tricky
Get a quote
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, ring 0345 464 0079 or send us an email.
Related advice
What sand mastic looks like in Maidenhead
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. With historic houses such as Dorney Court (about 3 miles south-east) nearby, there’s older building stock in the area around Maidenhead as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
If you look after a building such as Claires Court Schools, larger buildings have plenty of frames, and the mastic around each one ages. In the older streets around All Saints' Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Maidenhead is about 27 miles west of London, in Windsor and Maidenhead. Whether you are in the middle of Maidenhead or further out, we cover sand mastic for every kind of property, from flats and houses to offices and hotels. Maidenhead is one of 57 places in Windsor and Maidenhead where we work. Our Reading page covers work nearby, about 12 miles away.
All of SL6 is covered for sand mastic. That includes homes and businesses on High Street Mall, High Street and Laggan Square. You will find Maidenhead on the A4 and A308, so it’s easy for us to get to with everything needed for sand mastic. Close by, we work in Boyn Hill (1 mile south-west), Furze Platt (1 mile north), Cox Green (1 mile south-west), Pinkneys Green (1 mile north-west) and Bray Wick (2 miles south-east). We also work in nearby towns such as Windsor (5 miles south-east), North Ascot (7 miles south), Dedworth (5 miles south-east), Broomhall (10 miles south-east), South Ascot (9 miles south) and Old Windsor (8 miles south-east). As one of the bigger places in Windsor and Maidenhead, Maidenhead has every kind of property, from flats to offices.
Near you in Maidenhead
Around Maidenhead, our work takes us to homes and buildings near Boyne Hill CofE Infant and Nursery School, Desborough College and The Windsor Castle pub and the streets around them. The nearest railway station is Maidenhead station, roughly 0.5 miles south-east of the centre. Nearby you’ll also find The Reitlinger Bequest Museum (1.2 miles east) and St Mark's Hospital (0.6 miles west). Green spaces nearby include Weycock Hill and Taplow Lake.
Towns and villages near Maidenhead
What else we do in Maidenhead
Work for landlords, hotels and businesses
If you manage several properties in or around Maidenhead, several properties can go on one quote. Send us the addresses and the work at each, and photos by email help.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Do you need sand mastic in Maidenhead?
Previous repairs in cement or silicone often trap water or crack away. They do not move with the timber and we normally remove them.
Any of these means the joints need attention:
- Silicone on a period window that looks wrong
- Old cement repairs round a window that have failed
- Gaps where the frame meets the masonry
- Tired mastic found when preparing windows for paint
For landlords with property near Maidenhead station, older sash windows in a rental need their mastic kept sound to keep the weather out.
What your quote should include
- Whether they’re fully insured
- What guarantee comes with the work
- How the joint is cleaned and prepared
- How much experience the applicator has