Greater London · England
Clare Market Sand Mastic
Sand mastic across Clare Market and nearby, with old sealant always removed completely.
- Failed mastic on an exposed elevation
- Window mastic to renew ahead of painting
- Open joints round the window box
Sand mastic in Clare Market
Sand mastic is the traditional way to point the gap between a timber window frame and the stone or brick around it. It’s made from sand and a linseed-oil-based binder and built up by hand. On period homes, it looks right where silicone wouldn’t. Common call-outs are for mastic dropping out of the joint and gaps between timber frames and stone or brick, across timber door frames, period & listed homes and brick reveals.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. The mastic around them dries out and cracks with age, letting in draughts and water.
Each job carries a 12-month guarantee.
- Location
- Clare Market (WC2H, W1D, WC2B)
- Region
- Greater London
- Cover
- 12 months on all our work
- Quote
- A clear price before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
How the visit works
We keep the work tidy and contained to the joints we are treating, so you can get on with your day. The job generally takes a few hours for a single window, longer for several, and we explain the cure time before we leave. In Clare Market, 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 look at the surrounds with you and agree what needs doing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Deep voids are packed so the mastic is the right thickness.
- The mastic is mixed, pressed into the joint by hand and shaped.
- The finish is dressed so it sits neatly against the stone or brick.
Getting ready for the visit
- Try not to wet indoor joints just before the visit
- Mention any tricky access
- Let us know about parking restrictions
Getting a quote
Need a quote? Please phone 0345 464 0079 or send us an email with a few details. We will explain what we’d do and give you a clear quote before work begins.
Related advice
How the job changes by surface
Timber door frames
Round a period front door, sand mastic gives the right look.
Period and listed homes
Sand mastic is the like-for-like choice for many period homes. If your home is listed, ask your local planning authority about consent.
Clare Market: your questions answered
Can parking be tricky for a visit in Clare Market?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
Do you cover Clare Market for sand mastic?
Yes. Our work covers London and the South East, and Clare Market is part of that. Just phone 0345 464 0079 or email us with a few details of the job.
Can old silicone round a sash window be swapped for sand mastic?
Yes, we do this often. All the old silicone is removed first so the mastic can sit properly.
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.
Which is right for my windows, sand mastic or modern sealant?
We will help you decide. Period homes often look best with sand mastic, and modern sealants suit newer frames.
What’s sand mastic made of?
Sand plus a binder based on linseed oil. It’s built up in the joint by hand and shaped to suit the surround.
Do you work for landlords and businesses?
Yes. We work for householders, landlords, letting agents, businesses and hotels in Clare Market.
Is consent needed for window work on a listed home?
Your local planning authority is the one to ask. They decide whether consent is needed.
When something else is needed
Before you book, it’s worth knowing the limits too:
- Sash cords, weights and draught-proofing of the sashes
- Rotten sashes, sills or window boxes (a joiner’s job)
- Masonry that needs repairing
If in doubt, call 0345 464 0079 or drop us an email and we will say what we think before booking.
Where we work in Clare Market
- Sash and case windows
- Timber door frames
- Period & listed homes
- Brick reveals
- Stone surrounds
- Tenement windows
What sand mastic looks like in Clare Market
Historic houses like Dr Johnson's House (about 0.4 miles east) are a reminder that the area around Clare Market has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking.
In the older streets around Enon Chapel, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. As a London address, Clare Market can be tricky for parking: let us know about parking bays, permits or a driveway.
Clare Market is about 1 mile south of St Pancras, in Greater London. Whether you are in the middle of Clare Market or further out, we cover sand mastic for every kind of property, from flats and houses to offices and hotels. 764 places in Greater London are on our list, from the larger towns to small villages.
Our applicators cover all of WC2H, W1D and WC2B for sand mastic. Streets in the area include Drury Lane, New Square and Old Square. Clare Market is on the A4 and A301, which makes it straightforward to reach with everything needed for sand mastic. We also cover the places around Clare Market: Aldwych (1 mile south), Temple Bar (1 mile east), Covent Garden (1 mile south-west), Temple (1 mile south-east) and Seven Dials (1 mile west). Further out, we also cover Kensington (4 miles west), Walthamstow (6 miles north-east), Hampstead (4 miles north-west), Ruislip (13 miles west), Stockwell (3 miles south) and Orpington (13 miles south-east).
What’s near Clare Market
Locally, jobs take us to homes and businesses close to Lincoln's Inn Fields, London Nautical School and LSE Shaw Library. Other local landmarks include Ye Old White Horse pub (within half a mile north) and Mercers' School (under half a mile north-east). The closest station to Clare Market is London Charing Cross station, about 0.6 miles south-west of the centre. Other landmarks nearby include St Philip's Hospital (within half a mile north-west) and Montfichet's Tower (0.7 miles east). Open spaces near Clare Market include Ludgate Hill and St. James's Park Lake.
Leave it or put it right?
A silicone bead can be quicker, but on period stone or brick it often looks out of place. Sand mastic is the traditional material and finishes neatly against the masonry. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in Clare Market, the repair is bigger than a sealant job.
Combining jobs into one visit usually makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. We will send you a clear quote for the lot.
Why choose Mr Mastic in Clare Market
- Neat joints and a tidy finish
- Rated 4.9 stars on Google
- ARBOMaster approved applicator
- Domestic, commercial and hotel work
See our cost guide or what customers say.
How we quote for sand mastic
Call for a quick quote. What matters most is:
- How much there is to do
- Mould in or behind the old joints
- The product the joint needs
- How many areas need sealing
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 we need extra access for height. Your quote takes all of that into account.
What we need to know
Before you ask for a quote, have a think about:
- What the problem is, such as mould, gaps, leaks or cracking
- Where the job is, and your postcode
- How we’d reach the joints
- Any previous sealing or DIY work
Asking for a quote is easy: tell us what needs doing and where, and roughly how big it is. Photos by email help us understand the job, and we’ll take it from there.
Nearby places to Clare Market
Also in Clare Market
Common problems we fix in Clare Market
Decorating can disturb tired mastic. Many people find it crumbling when they prepare the windows.
People normally contact us after spotting something like this:
- Old cement repairs round a window that have failed
- Draughty sash windows at the surround
- Open joints round the window box
- Failed mastic on an exposed elevation
Managing a site like St Clement Danes CofE Primary School? Then its window and door frames need their mastic kept sound, just like a home’s.
What to look for in a quote
- Whether they seal over old material or remove it
- What insurance they hold
- Whether the sealant suits the joint
- Is VAT in the price?
Work for landlords, hotels and businesses
Landlords and letting agents in Clare Market can book us as well as homeowners. Resealing between tenancies keeps a property looking cared for before the next move-in.
In hotels, rooms out of use cost money, so we plan the work room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.