Greater London · England
Sand mastic for sash & case windows in Soho, Greater London
Sand mastic in Soho from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Gaps where the frame meets the masonry
- A silicone bead on a sash window that spoils the look
- Crumbling sand mastic round a window
Windows and doors in Soho
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 Benjamin Franklin House (about 0.5 miles south-east) nearby, there’s older building stock in the area around Soho as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
Soho is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. If you live in an older home near St Anne's Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Soho is about 1 mile east of City of Westminster, in Greater London. Every kind of property in Soho is covered for sand mastic. Every job comes with our 12-month guarantee. We cover 764 towns and villages across Greater London, from the larger towns to small villages.
Work in W1F, W1T and W1D works the same way as everywhere else we cover. If you need sand mastic at a property on Duck Lane, Drury Lane and Bridle Lane or anywhere close by, our applicators can take on the job. Being close to the A4 and A301, Soho is simple for us to get to. We also cover the places around Soho: West End (1 mile east), Chinatown (1 mile south), Seven Dials (1 mile east), St Giles (1 mile north-east) and St James's (1 mile south). Larger places within reach include Kensington (3 miles west), Walthamstow (7 miles north-east), Whitechapel (3 miles east), Hampstead (3 miles north-west), Ruislip (13 miles west) and Stockwell (3 miles south).
Local landmarks in Soho
We work in homes and buildings around Bar Soho, St Anne's Churchyard and Harris Westminster Sixth Form, among other places. Nearby too are LITE Regal International School (0.6 miles west) and London Library (0.5 miles south-west). There’s a railway station in Soho itself: Tottenham Court Road station. Well-known places in the area include Kingly Court (less than half a mile west) and Montfichet's Tower (1.3 miles east). The countryside around Soho includes St. James's Park Lake and Ludgate Hill.
About our sand mastic in Soho
Sand mastic doesn’t last for ever and gaps open up round the frame. Renewing it closes the gap and tidies the surround. We work on timber door frames, tenement windows and stone surrounds, and people most often call us about gaps round a timber door in stone or brick and a silicone bead on a sash window that spoils the look.
Much of London’s older housing was built with timber sash windows, some still in place and some long since replaced. Either way, the mastic between frame and brickwork is what stops draughts and rain getting in.
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.
- Where
- Soho (W1F, W1T, W1D)
- Region
- Greater London
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Other services in Soho
Why act early in Soho
Draughts round a sash window are not always the sashes. Gaps between the frame and the wall can be just as bad, and renewing the mastic closes them. In a London flat, a failed joint rarely stays your problem alone: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
Combining jobs into one visit generally makes better use of the time than several visits, so tell us about everything that needs sealing. You’ll get one clear quote for the whole job.
Why us?
- Anti-fungal silicone where joints get wet
- An ARBOMaster approved applicator
- A 12-month guarantee on all work
- We’re fully insured
Take a look at how sealant jobs are priced or what customers say.
FAQs for Soho
I let a flat near Tottenham Court Road station. Can you help?
Yes, rental work is part of what we do. 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.
Do you cover Soho for sand mastic?
Yes. Our work covers London and the South East, and Soho is part of that. Just phone 0345 464 0079 or drop us an email with a few details of the job, and we will give you a clear quote.
Are you insured?
Yes. We are fully insured.
Do I have to be there?
For indoor joints, yes, someone needs to let us in. Once we have agreed the job, you don’t need to watch us work.
Do you offer different sealant colours?
Generally, yes. White, clear and grey are common, and other colours are available, and we’ll agree it with you first.
How do I get a quote for sand mastic in Soho?
We don’t publish prices, because the cost depends on the job: how much there is, what’s there now, how we reach it and what it needs. We agree the price before any work begins.
Is sand mastic better than silicone for my windows?
Sand mastic normally suits period timber windows best. On modern frames, we’d normally use a flexible sealant, and we will explain why.
What information do you need?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
When something else is needed
A few problems are outside what sealant work can do:
- Sash cords, weights and draught-proofing of the sashes
- Damaged stone surrounds
- Cracked or broken glass
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we’ll tell you honestly.
Where we work in Soho
- Stone surrounds
- Tenement windows
- Period & listed homes
- Brick reveals
- Timber door frames
- Sash and case windows
When to call us in Soho
Decorating can disturb tired mastic. Many people find it crumbling when they prepare the windows.
Common reasons people contact us are:
- Tired mastic found when preparing windows for paint
- Cement or filler used on old window joints that has cracked
- A silicone bead on a sash window that spoils the look
- Old sand mastic that has cracked, crumbled or fallen out
Letting a property close to Tottenham Court Road station? Then older sash windows in a rental need their mastic kept sound to keep the weather out.
Before you book anyone
- When the joint can take water or movement
- How hidden problems are handled
- Whether they’re fully insured
- Which colour the sealant will be
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Make sure water runs off the sill
- Sort the mastic before the decorators arrive
- Keep modern sealant off the mastic
- Avoid heavy scraping on the mastic joint
When preparing windows for paint, take care around the mastic. It can be damaged by heavy scraping.
Good mastic helps keep the frame dry. Once it fails, water can sit against the timber, which can lead to rot.
How it works
All our tools and materials come with us in the van, so there’s nothing for you to buy. Once we’ve agreed what’s being done, the area is protected and the work begins. It normally takes anything from a few hours to a full day, depending on how many windows. In Soho, as in most of London, parking needs a little planning. 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.
- The sand mastic is mixed and pressed into the joint by hand.
- We dress the finish so it sits neatly against the masonry.
Getting ready for the visit
- Mention any leaks or damp you’ve noticed
- Clear the area around the work
- Keep pets and children clear of the area while we work
Get a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we will talk you through what we’d do. When it suits you, phone 0345 464 0079 or send us an email.
Read more
Work for landlords, hotels and businesses
Housing providers, facilities teams and property managers book us too in Soho and across Greater London. We can quote a run of properties together, and we’re fully insured.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we will give you a quote.
How the job changes by surface
Sash and case windows
On a sash window, the mastic joint shows on the outside, so a neat, even finish matters.
Brick reveals
Loose mastic comes out and deep gaps are packed before pointing.