Greater London · England
Sand mastic for sash & case windows in West End, Greater London
Sand mastic for West End and the surrounding area: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Mastic worn away on windows facing the weather
- Crumbling sand mastic round a window
- Gaps between timber frames and stone or brick
Sand mastic in West End, done properly
We work across West End renewing sand mastic on sash windows and doors. Each joint is raked out, prepared and pointed by hand, finished to suit the masonry. If you are dealing with wind and rain getting in round a sash window and modern sealant on a period surround, we can help.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. Over the years, the sealant around them shrinks, cracks and pulls away, which is when draughts and damp patches appear in homes in West End.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Location
- West End (W1F, W1D, W1T)
- Region
- Greater London
- Cover
- One year on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Windows and doors in West End
With historic houses such as Benjamin Franklin House (about 0.4 miles south) nearby, there’s older building stock in the area around West End as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. In London conversions and blocks, the lease decides who is responsible for the frames, so check that before you book.
Schools such as Soho Parish CofE Primary School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s. Homes close to St Mary's Church include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
West End is about 1 mile east of City of Westminster, in Greater London. From the centre of West End to the outskirts, we cover sand mastic for every kind of property. West End is one of 764 towns and villages in Greater London where we work for sand mastic.
Every address in W1F, W1D and W1T is within our area for sand mastic, from the main roads to the quietest streets. You’ll find streets such as Duck Lane, Drury Lane and Bridle Lane. Main roads around West End include the A301 and A400, which makes travel easy. We also cover the places around West End: Seven Dials (1 mile east), St Giles (1 mile north-east), Soho (1 mile west), Chinatown (1 mile south-west) and Covent Garden (1 mile east). We also work in nearby towns such as Kensington (3 miles west), Walthamstow (7 miles north-east), Whitechapel (3 miles east), Hampstead (4 miles north-west), Ruislip (13 miles west) and Stockwell (3 miles south).
Landmarks near West End
Locally, jobs take us to homes and businesses close to LSE Shaw Library, Brewdog pub and St Anne's Churchyard. Nearby too are Harris Westminster Sixth Form (1 mile south) and LITE Regal International School (0.7 miles west). There’s a railway station in West End itself: Tottenham Court Road station. A little further out are St Paul's Hospital (less than half a mile north-east) and Leverian collection (under half a mile south). Not far away are St. James's Park Lake and Barnsbury Wood.
Your questions about sand mastic in West End
Is parking an issue for sand mastic in West End?
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 Tottenham Court Road station?
Yes, landlords and agents are among the people we work for. You can ring 0345 464 0079 or drop us an email with the details for a clear quote.
Does someone need to be in?
Access is agreed with you when the job is booked. Indoors, that usually means someone at home.
What should I tell you?
The location, the problem and the rough size of the job. Photos by email help too.
When will the new mastic be hard?
It forms a skin fairly soon and it hardens fully over a longer time. Timing depends on the weather and the joint.
Will it make a mess?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.
Is it OK to seal over old sealant?
No. Fresh sealant does not stick to old sealant, and it traps any mould or water underneath. It all has to come out first.
Where do you work from?
Mr Mastic is based in Crawley. We cover West End and the rest of Greater London.
What we do, step by step
There isn’t much for you to do on the day. Point us to the joints and we will get on with it. The job generally takes anything from a few hours to a full day, depending on how many windows, including the tidy-up. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in West End. A visitor permit or a nearby bay makes the visit run more smoothly.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- We finish the mastic to a tidy line.
How to prepare
- Move anything stored near the joints
- Try not to wet indoor joints just before the visit
- Keep pets and children clear of the area while we work
How to get a quote
Asking for a quote is easy: let us know what needs doing and where. A few photos by email make the job easier to understand.
Read more
Places near West End
More services for West End
When to call us in West End
Over the years, sand mastic weathers. It hardens, cracks and starts to come away from the frame or the masonry.
People normally contact us when they notice something like this:
- Draughts and rain around sash boxes
- Old cement repairs round a window that have failed
- Mastic round period door frames that has failed
- A silicone bead on a sash window that spoils the look
For landlords with property near Tottenham Court Road station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Before booking anyone
- How long the guarantee is
- What the cure time is
- Whether you can choose the colour
- Who does the work, and how experienced they are
Landlord and commercial work in West End
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we will give you a quote.
We also work for property managers and facilities teams in West End and across Greater London. We can quote a run of properties together, and we are fully insured.
What sealant work can’t fix
We will always be straight with you, so here’s what new sealant will not do:
- Sash cords, weights and draught-proofing of the sashes
- Crumbling stone or brickwork round the window
- Planning or listed building consent (your local planning authority decides)
If in doubt, phone 0345 464 0079 or send us an email and we’ll say what we think before booking.
Joints and surfaces we work on
- Timber door frames
- Sash and case windows
- Stone surrounds
- Period & listed homes
- Tenement windows
- Brick reveals
Aftercare tips
Looking after new joints is easy, and it makes a real difference:
- Ask a joiner to look at soft timber first
- Avoid heavy scraping on the mastic joint
- Check with your local planning authority if your home is listed
- Leave the new mastic unpainted
Keep paint scrapers and sanders off the mastic when redecorating. Hard scraping can loosen it.
Gaps round a sash box let in draughts and rain. The longer it’s left, the more the joint opens.
What happens if it’s left?
Gaps round a sash window let in rain and draughts. Water can get to the frame and the masonry, so dealing with it now protects both. In London conversions, one flat’s bathroom is often above another flat’s ceiling, and a slow leak from a failed seal can end up in the flat below. Putting it right early is much less trouble for homes in West End.
Rather than a set price list, we price the job in front of us: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
Why West End customers choose us
- More than 20 years in sealant work
- Approved under the ARBOMaster scheme
- We’re fully insured
- 4.9 on Google from 180+ five-star reviews
Take a look at what affects the cost and what customers say.
Quotes for sand mastic in West End
You’ll get a clear quote before work begins. It takes into account:
- How many areas need sealing
- The number and length of the joints
- The product the joint needs
- The old material and how stubborn it is
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether the work is at height. We take all of that into account in your quote.
What to tell us for a quote
There’s no need for technical detail. It helps if you can tell us:
- How many joints, rooms or windows are involved
- Any previous sealing or DIY work
- If it’s domestic, commercial or a hotel
- Photos by email, if that is easy
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is.