Surrey · England
Sunbury-on-Thames Sand Mastic
Window and door surrounds in Sunbury-on-Thames need attention? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Window mastic to renew ahead of painting
- Mastic worn away on windows facing the weather
- Gaps round a timber door in stone or brick
Sand mastic in Sunbury-on-Thames, done properly
We renew sand mastic around sash windows and doors in stone and brick. The old mastic is raked out, the joint is prepared and new mastic is shaped by hand. We work on period & listed homes, sash and case windows and stone surrounds, and the jobs we see most are patchy fillers round a sash window and mastic that needs renewing before redecorating.
Around Sunbury-on-Thames, 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. Sills, frame heads and glazing joints are where leaks generally start.
You get a one-year guarantee, the same in Sunbury-on-Thames as everywhere else we work.
- Place
- Sunbury-on-Thames (TW16)
- Region
- Surrey
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
What sealant work can’t fix
Before booking, it’s worth knowing the limits too:
- Broken panes
- Sashes that rattle, stick or won’t open
- Masonry that needs repairing
If you’re not sure, just call 0345 464 0079 or drop us an email and we will give you a straight answer before booking.
What we seal
- Sash and case windows
- Brick reveals
- Period & listed homes
- Stone surrounds
- Tenement windows
- Timber door frames
How it works
There’s no need to move everything out, just the space around the work. We protect the rest, and the work takes anything from a few hours to a full day, depending on how many windows for a typical job. In Sunbury-on-Thames, parking is rarely complicated, though it helps to know about driveways or restrictions, and let us know if the work is upstairs, in a flat or up high outside.
- We start by checking each surround and agreeing the joints to renew.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic isn’t too thick.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- The mastic is finished to sit tidily against the stone or brick.
Preparing for the visit
- Tell us about access, such as stairs, a lift or high-level joints
- Plan for the work area to be out of bounds to pets and children
- Clear items away from the joints we are working on
Ask for a quote
We do not publish a price list, because every job is different. Instead, we send you a clear quote for your job. To get started, phone 0345 464 0079 or email us.
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Quotes for sand mastic in Sunbury-on-Thames
We do not publish a price list, because jobs vary so much. The quote depends on:
- The product the joint needs
- The size of the job
- Access and height
- How much old sealant there is and how hard it is to remove
A few things move the cost up or down: how much old sealant there is and how stubborn it is, any mould to treat, and whether the work is at height. Your quote takes all of that into account.
Asking for a quote
When you contact us, these details help:
- A few pictures by email, if you can
- Roughly how big the job is
- What’s wrong with the joints now
- Access, such as stairs, a lift or height
Need a quote? Please ring 0345 464 0079 or drop us an email with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.
Common questions in Sunbury-on-Thames
Do you work for landlords with property near Sunbury station?
Yes, landlords and agents are among the people we work for. You can call 0345 464 0079 or drop us an email with the details for a clear quote.
Is there a guarantee on sand mastic in Sunbury-on-Thames?
All our work, in Sunbury-on-Thames and everywhere else, comes with a 12-month guarantee. We are fully insured, and an ARBOMaster approved applicator.
Do I need permission for sand mastic on a listed building?
Yes, it’s worth checking. Your local planning authority can say if consent is needed for listed or conservation-area properties.
How do I get a quote for sand mastic in Sunbury-on-Thames?
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.
Are you ARBOMaster approved?
Yes. We’re approved under the ARBOMaster scheme, the approved applicator scheme for Arbo sealants.
Can you seal over the old sealant?
No. Fresh sealant does not stick to old sealant, and anything trapped underneath, including mould and water, stays there. It all has to come out first.
Does someone need to be in?
For indoor joints, yes, someone needs to let us in. Once we have agreed the job, you don’t need to watch us work.
How long does the job take?
Typically it takes a few hours for a single window, longer for several. Larger jobs naturally take longer, and we’ll say how long yours will take.
Also near Sunbury-on-Thames
Other services in Sunbury-on-Thames
Signs you need sand mastic in Sunbury-on-Thames
Age is the main cause. Even well-laid mastic needs renewing in time, depending on exposure and upkeep.
Common reasons people contact us include:
- Weathered mastic on the most exposed windows
- Window mastic to renew ahead of painting
- Draughts and rain around sash boxes
- Cement or filler used on old window joints that has cracked
Schools such as St Ignatius RC Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
Questions to ask before you book
- Who does the work, and how experienced they are
- How the colour is chosen
- What the quote includes, VAT included or not
- How long to leave it before use
Looking after it afterwards
No joint lasts for ever, but care makes a real difference. Our tips:
- Ask us before painting near the mastic
- Plan mastic work ahead of painting
- Avoid patching sand mastic with silicone
- Avoid heavy scraping on the mastic joint
Check the mastic when you check the paintwork. Small cracks are easier to deal with early.
Sound mastic protects the frame. Once it fails, water can sit against the timber and timber that stays wet can rot.
Work for landlords, hotels and businesses
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.
We also work for property managers and facilities teams in Sunbury-on-Thames and across Surrey. Several sites can go on one quote.
Windows and doors in Sunbury-on-Thames
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as Hampton Court Palace (about 3.5 miles east) nearby, there’s older building stock in the area around Sunbury-on-Thames as well as newer homes. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
For landlords with property near Sunbury station, cracked sand mastic around sash windows lets in the draughts tenants complain about. In the older streets around St Saviour, the joint between an old wall and a newer frame is usually the first place rain gets in.
Sunbury-on-Thames is about 7 miles south of Hayes, in Surrey. Sunbury-on-Thames gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. 395 places in Surrey are on our list, from the larger towns to small villages. For nearby work, see our London page, about 15 miles away.
Postcode districts we cover here for sand mastic: TW16. We cover properties on Station Road, The Ridings and Ravenscourt. Being close to the A244 and A308, Sunbury-on-Thames is simple for us to get to. Other places close to Sunbury-on-Thames include Upper Halliford (1 mile south-west), Charlton (1 mile west), Ashford Common (1 mile north-west), Hounslow (1 mile north) and Littleton Common (1 mile west). Within a short drive, we also cover Guildford (13 miles south-west), Woking (10 miles south-west), Camberley (15 miles south-west), Epsom (8 miles south-east), Ewell (8 miles south-east) and Egham (6 miles west).
Around Sunbury-on-Thames
We work in homes and buildings around Sunbury Manor School, The Three Fishes Public House and Sunbury Park and the streets around them. There’s a railway station in Sunbury-on-Thames itself: Sunbury station. Well-known places in the area include Kempton Steam Museum (1 mile north-east) and No. 2 New Zealand General Hospital (2 miles south). Not far away are St Ann's Hill and Kempton Park Reservoirs.
Should I try it myself first?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
The difference is mostly in the preparation and the 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.