Greater London · England
Sand Mastic in Charing Cross
Sand mastic in Charing Cross from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Old sand mastic that has cracked, crumbled or fallen out
- Silicone on a period window that looks wrong
- Failed mastic on an exposed elevation
Sand mastic in Charing Cross
Sand mastic suits most period window surrounds. Newer frames normally get a flexible sealant instead, and we’ll talk through which suits your home. If you are dealing with patchy fillers round a sash window and mastic dropping out of the joint, we can put it right.
Much of London’s older housing was built with timber sash windows, some still in place and some long since replaced. Whatever is in the opening now, the joint between frame and wall is what keeps the weather out, in Charing Cross as anywhere.
All of our work is guaranteed for twelve months, and the guarantee is the same wherever you are.
- Location
- Charing Cross (W1F, W1D, W1S)
- Region
- Greater London
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Charing Cross questions
I let a flat near London Charing Cross station. Can you help?
Yes, we work for landlords and letting agents. You can ring 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before any work starts.
Is parking an issue for sand mastic in Charing Cross?
Parking in Charing Cross, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot.
Can I add another job to the visit?
Of course. Combining jobs makes good use of the visit.
Where is Mr Mastic based?
We work from Crawley. We cover Charing Cross and the rest of Greater London.
Do you come to Charing Cross?
Yes. From our base in Crawley, we cover South East England, London and all of Scotland, Charing Cross included.
Can I do it myself?
That depends on the joint. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional, while a short indoor joint may be within reach.
Are you an approved applicator?
Yes. We’re approved under the ARBOMaster scheme, the approved applicator scheme for Arbo sealants.
Is it OK to seal over old sealant?
No. New silicone will not bond to old silicone, and it traps any mould or water underneath. It all has to come out first.
What happens on the day
All our tools and materials come with us in the van, so you do not need to buy or prepare anything. After a quick look at the joints together, we protect the area and start. It normally takes a few hours per window, depending on the condition of the joints. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Charing Cross. It helps if you can point us to a visitor permit or a bay close to the door.
- First, we look at the surrounds with you and agree what needs doing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- We pack any deep gaps so the mastic sits at the right depth.
- The mastic is mixed, pressed into the joint by hand and shaped.
- The mastic is finished to sit tidily against the stone or brick.
Preparing for the visit
- For business premises, tell us about site rules or sign-in
- Mention any leaks or damp you’ve noticed
- Try not to wet indoor joints just before the visit
Getting a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Tell us about the joints that need doing and we will explain what’s involved.
Related advice
Also near Charing Cross
Also in Charing Cross
Looking after it afterwards
So the new joints stay in good condition:
- Take care around the mastic when scraping paint
- Look over the window mastic once a year
- Leave the new mastic unpainted
- Plan mastic work ahead of painting
Avoid sealing over the mastic with silicone. If you see a crack, ask us to take a look rather than patching it.
Small cracks are a sign the mastic is ageing. It’s easier to renew it before it drops out.
Work for landlords, hotels and businesses
We also work for property managers and facilities teams in Charing Cross and across Greater London. Several sites can go on one quote, and we’re fully insured for the work.
For anyone letting property in or around Charing Cross, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs.
Signs you need sand mastic in Charing Cross
Shallow joints are a common cause. A thin layer doesn’t hold well so we make sure the new mastic is the right thickness.
Most people get in touch when they notice one of these:
- Mastic dropping out of the joint
- Mastic round period door frames that has failed
- Open joints round the window box
- Weathered mastic on the most exposed windows
As a London address, Charing Cross can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
What to look for in a quote
- What product goes in the joint
- What the quote includes, VAT included or not
- How the surfaces are prepared before sealing
- What the cure time is
Should I try it myself first?
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
What affects the quote in Charing Cross
Jobs vary more than people expect. The main factors:
- How much there is to do
- The number of rooms or windows
- Whether old sealant or filler has to be cut out
- Access and height
The cost reflects the work involved, not guesswork. That is why we ask a few questions first and send you a clear quote before any work starts.
What we need to know
To make quoting easier, please include:
- If someone has resealed it before
- Where the job is, and your postcode
- Pictures of the joints, sent by email
- The type of property
For sand mastic in Charing Cross, ring 0345 464 0079 or send us an email. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Why it’s worth doing now in Charing Cross
Filling over old, loose mastic doesn’t last. Raking out and preparing the joint gives it a sound base so the new work lasts. In a London flat, a failed joint rarely stays your problem alone: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, any mould to treat, and whether we need extra access for height. Your quote takes all of that into account.
Why choose Mr Mastic in Charing Cross
- Homes, businesses and hotels
- ARBOMaster approved applicator
- Quality sealants from Arbo and Everbuild
- A 12-month guarantee on all work
Windows and doors in Charing Cross
Historic houses like Benjamin Franklin House (about 0.1 miles east) are a reminder that the area around Charing Cross has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window. In London conversions and blocks, the lease decides who is responsible for the frames, so it’s worth checking before booking.
Rented homes near London Charing Cross station change hands often, and any sash windows need sound mastic to keep draughts and rain out. Schools such as Soho Parish CofE Primary School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s.
Charing Cross is about 1 mile south-east of City of Westminster, in Greater London. For sand mastic in and around Charing Cross, it’s easy to get a quote: please phone 0345 464 0079 or drop us an email. We cover Greater London from our Crawley base. Charing Cross is one of 764 places in Greater London where we work.
Postcode districts we cover here for sand mastic: W1F, W1D and W1S. You will find streets such as Duck Lane, Drury Lane and Bridle Lane, and we cover them all. With the A4 and A301 close by, Charing Cross is simple for us to get to. We also cover St James's (1 mile west), Adelphi (1 mile north-east), Chinatown (1 mile north-west), West End (1 mile north) and Covent Garden (1 mile north-east). Further out, we also cover Kensington (3 miles west), Walthamstow (7 miles north-east), Hoxton (3 miles north-east), Whitechapel (3 miles east), Hampstead (4 miles north-west) and Ruislip (13 miles west).
Around Charing Cross
We work in homes and buildings around Westminster Abbey Choir School, Silver Cross Tavern and Harris Westminster Sixth Form and the streets around them. You will also find London Library (within half a mile west) and Victoria Embankment Gardens (less than half a mile east). There’s a railway station in Charing Cross itself: London Charing Cross station. Nearby you’ll also find Montfichet's Tower (1.2 miles east) and Royal United Services Institute (less than half a mile south). Green spaces nearby include Barnsbury Wood and St. James's Park Lake.