Greater London · England
Sand mastic for sash & case windows in Yiewsley, Greater London
Sand mastic for Yiewsley, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Wind and rain getting in round a sash window
- Weathered mastic on the most exposed windows
- Gaps where the frame meets the masonry
How we handle sand mastic in Yiewsley
On many period windows, sand mastic looks right and suits the building. On modern frames we’d normally use a flexible sealant and we’ll explain which is best for yours. If you have wind and rain getting in round a sash window and failed mastic on an exposed elevation, we can put it right, whatever the surface.
Many London homes are flats, with windows high above the street. In a converted house or block, the lease normally says who is responsible for the windows, so it’s worth checking before booking, and access in Yiewsley is something to talk through when you book.
All of our work is guaranteed for twelve months, in Yiewsley and everywhere else we cover.
- Location
- Yiewsley (UB7, UB8)
- Wider area
- Greater London
- Cover
- A year, on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
What affects the quote in Yiewsley
Call for a quick quote. The main things that affect it are:
- Whether the work is at height
- The number of rooms or windows
- The product the joint needs
- Mould in or behind the old joints
Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Asking for a quote
Before you ask for a quote, have a think about:
- Any access issues, like height or stairs
- Roughly how big the job is
- If it’s domestic, commercial or a hotel
- What the problem is, such as mould, gaps, leaks or cracking
Every job is quoted individually, so the first step is telling us about yours. Simply ring 0345 464 0079 or drop us an email and describe the job, and pictures are welcome.
When to call us in Yiewsley
Shallow joints are a common cause. A thin layer does not hold well so we make sure the new mastic is the right thickness.
Most people get in touch when they notice one of these:
- Silicone on a period window that looks wrong
- Gaps where the frame meets the masonry
- Cement or filler used on old window joints that has cracked
- Draughty sash windows at the surround
Homes close to St Matthew's include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame.
What to look for in a quote
- What guarantee comes with the work
- How long to leave it before use
- What product goes in the joint
- How the joint is cleaned and prepared
What sand mastic looks like in Yiewsley
In London conversions and blocks, the lease decides who is responsible for the frames, so check that before you book. With historic houses such as Ickenham Hall (about 3.3 miles north) nearby, there’s older building stock in the area around Yiewsley 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 site and facilities teams at buildings such as Rabbsfarm Primary School, its window and door frames need their mastic kept sound, just like a home’s. Yiewsley is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Yiewsley is about 2 miles south-west of Hillingdon, in Greater London. Our applicators cover sand mastic for homes and businesses in Yiewsley. 764 places in Greater London are on our list, large and small. For nearby work, see our London page, about 16 miles away.
Every address in UB7 and UB8 is within our area for sand mastic. We cover properties on High Street, Castle Avenue and Kingston Avenue and the roads around them. With the A408 close by, Yiewsley is simple for us to get to. Other places close to Yiewsley include West Drayton (1 mile south), Cowley (1 mile north-west), Thorney (1 mile south-west), Hillingdon (2 miles north-east) and Uxbridge (2 miles north). Within a short drive, we also cover City of Westminster (13 miles east), Marylebone (14 miles east), Kensington (11 miles east), St Pancras (15 miles east), Hampstead (13 miles east) and Ruislip (5 miles north-east).
Local landmarks in Yiewsley
In Yiewsley, that means homes and buildings near Stockley Academy, Lake Farm Country Park and George and Dragon pub and the streets around them. The closest station to Yiewsley is West Drayton station, roughly 0.5 miles south-west. A little further out are Hillingdon Hospital (0.7 miles north) and The Chimes (2.1 miles north). For a walk, there’s Uxbridge Moor and Staines Reservoirs.
When it isn’t the sealant
To be straight with you, there are a few things sealant will not fix:
- Planning or listed building consent (your local planning authority decides)
- Broken panes
- Rotten sashes, sills or window boxes (a joiner’s job)
If you’re not sure, just ring 0345 464 0079 or send us an email and we’ll give you a straight answer.
Joints and surfaces we work on
- Brick reveals
- Sash and case windows
- Timber door frames
- Tenement windows
- Period & listed homes
- Stone surrounds
Yiewsley questions
Is parking a problem for a job in Yiewsley?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. That way the visit can be planned around it.
Can you help a landlord with a rental near West Drayton station?
Yes, we work for landlords and agents. You can ring 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before we start.
Are you ARBOMaster approved?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
How long will you be here?
Most jobs take anything from a few hours to a full day, depending on how many windows, including the preparation. Your quote will say how long we expect yours to take.
Can new sealant go over the old?
No, and we never do. It can look neat for a few weeks, but the new bead soon lifts. Removing the old sealant completely is the only lasting way.
Do you take out the old sealant first?
Yes. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
Can I choose the sealant colour?
Yes. White, clear and grey are common, and other colours are available, and we will agree it with you first.
Do I have to be there?
Access is agreed with you when the job is booked. For inside work, that normally means someone being in.
DIY sealant or a professional job?
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, then guaranteed for a year.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
How the visit works
When we arrive, we start by going over the job with you. We protect the surfaces around the joints before we start. The work usually takes anything from a few hours to a full day, depending on how many windows. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Yiewsley. It helps if you can point us to a visitor permit or a bay close to the door.
- First we agree which joints need doing.
- Old mastic and any loose material are raked out.
- Deep gaps are packed so the mastic sits at the right depth.
- We apply the mastic by hand and shape it.
- The surface is finished to suit the stone or brick.
How to prepare
- Mention any tricky access
- Mention any sign-in or site rules at work premises
- Move anything stored near the joints
Ask for a quote
There’s no standard price list, as no two jobs are quite the same. Instead, we send you a clear quote for your job. To arrange one, ring 0345 464 0079 or drop us an email.
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Also near Yiewsley
What else we do in Yiewsley
Landlords, agents and businesses in Yiewsley
In hotels, rooms out of use cost money, so we plan the work room by room. We’ve worked in hotels as well as homes and businesses.
From a single let to a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
Keeping the joints in good condition
So the new joints stay in good condition:
- Check with your local planning authority if your home is listed
- Ask us before painting near the mastic
- Clear gutters so water does not pour onto the windows
- Avoid patching sand mastic with silicone
Do not touch or press the mastic while it hardens. It forms a skin fairly soon, but takes longer to harden fully.
An open joint round the box lets weather through. Left, the gap tends to get bigger as more mastic falls out.