Greater London · England
Sand mastic for sash & case windows in St George's Fields, Greater London
We cover St George's Fields for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old material cut out, joints cleaned and sealed neatly.
- Draughts and rain around sash boxes
- Failed mastic on an exposed elevation
- Mastic dropping out of the joint
What we are called out for in St George's Fields
Sand mastic slowly weathers. It dries out, cracks and loses its grip on the stone or timber.
Most people get in touch when they notice one of these:
- Window mastic to renew ahead of painting
- Modern sealant on a period surround
- Draughts and rain around sash boxes
- Failed mastic on an exposed elevation
If you let a flat or house near Elephant & Castle station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
What to look for in a quote
- How hidden problems are handled
- What insurance they hold
- The length of the guarantee
- Which sealant they’ll use, and why
About our sand mastic in St George's Fields
Sand mastic suits most period window surrounds. On modern frames we’d normally use a flexible sealant and we’ll explain which is best for yours. Typical jobs include cracked mastic round a front door frame and mastic dropping out of the joint, across tenement windows, timber door frames and brick reveals.
London’s Victorian and Edwardian terraces were built with timber sash windows, and many still have them or their replacements. Whatever is in the opening now, the joint between frame and wall is what keeps the weather out.
Our work is backed for twelve months, in St George's Fields and everywhere else we cover.
- Place
- St George's Fields (SE1, SE11, SE17)
- Region
- Greater London
- Cover
- 12 months on all our work
- Quotes
- A clear price before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
What we do, step by step
At the end, we look at the finished work together. The work normally takes a few hours for a single window, longer for several, depending on the size of the job. In a London area like St George's Fields, the main things to plan are parking and access: tell us about permits, visitor bays or off-street space, which floor we’re working on and whether there’s a lift.
- 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.
- The finish is dressed neatly.
Before we arrive
- Mention if the joints have been sealed before
- Move anything stored near the joints
- Plan for the work area to be out of bounds to pets and children
How to get a quote
Want a quote for sand mastic? Please call 0345 464 0079 or email us with a few details. You will know what we plan to do, and what it will cost, before any work begins.
Related advice
Why it’s worth doing now in St George's Fields
An open joint round the frame lets weather in. Left, water can reach the timber and the wall so renewing it early protects the window. Converted houses in London often have a bathroom above someone else’s living room, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Dealing with it early is far simpler for homes in St George's Fields.
We do not show prices on the website, because each job is priced on what it involves. Call for a quick quote.
Why choose Mr Mastic in St George's Fields
- Anti-fungal silicone where joints get wet
- Domestic, commercial and hotel work
- Approved under the ARBOMaster scheme
- 180+ five-star Google reviews
Read how sealant jobs are priced and customer reviews.
Sand mastic in St George's Fields: local notes
With historic houses such as Benjamin Franklin House (about 1.1 miles north-west) nearby, there’s older building stock in the area around St George's Fields as well as newer homes. In older buildings, 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 check that before you book.
If you live in an older home near Former Church of St Jude, the joint between an old wall and a newer frame is normally the first place rain gets in. Managing a site like St George's Cathedral Catholic Primary School? Then its window and door frames need their mastic kept sound, just like a home’s.
St George's Fields is about 1 mile west of London, in Greater London. We provide sand mastic to homes and businesses in St George's Fields. Across Greater London, we cover 764 places, St George's Fields among them.
Every address in SE1, SE11 and SE17 is covered for sand mastic, from the main roads to the quietest streets. If you need sand mastic at a property on York Road, Spur Road and Bear Lane or a nearby road, our applicators can take on the job. You will find St George's Fields on the A300 and A302, which makes it straightforward to reach with everything needed for sand mastic. If you are just outside St George's Fields, we cover Elephant and Castle (1 mile south-east), Newington Butts (1 mile south-east), Vauxhall (1 mile south-west), Lambeth (1 mile south-west) and Westminster (1 mile west). We also work in nearby towns such as Kensington (4 miles west), Walthamstow (7 miles north-east), Hoxton (3 miles north), Hampstead (5 miles north-west), Ruislip (14 miles west) and Brompton (3 miles west).
Local landmarks in St George's Fields
Typical jobs here are in homes near The Duke Of Clarence Public House, London School of Musical Theatre and Lambeth Palace Library. Also close by are Notre Dame Roman Catholic Girls' School (less than half a mile south-west) and Geraldine Mary Harmsworth Park (under half a mile south-west). St George's Fields has its own railway station: Elephant & Castle station. A little further out are Baynard's Castle (0.9 miles north) and General Lying-In Hospital (0.5 miles west). For a walk, there’s Bellenden Road Nature Garden and St. James's Park Lake.
For landlords and businesses
Housing providers, facilities teams and property managers book us too in St George's Fields and across Greater London. We can quote a run of properties together.
Landlords and letting agents in St George's Fields can book us as well as householders. Sealant work between tenants is a simple way to keep a property in good order.
What we can’t put right
We’d rather tell you now than do work that will not last, so here’s what sealant cannot put right:
- Masonry that needs repairing
- Timber that has rotted
- Cracked or broken glass
If you are not sure, just phone 0345 464 0079 or email us and we will give you a straight answer before you book.
Surfaces we seal
- Timber door frames
- Tenement windows
- Period & listed homes
- Brick reveals
- Stone surrounds
- Sash and case windows
DIY versus a professional finish
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.
Nearby places to St George's Fields
Also in St George's Fields
St George's Fields questions
Can you do sand mastic in St George's Fields?
Yes, St George's Fields is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or email us and let us know what needs doing, and we’ll give you a clear quote.
Is parking a problem for a job in St George's Fields?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. That way the visit can be planned around it.
Do I have to be there?
That depends on where the joints are. For work indoors, someone needs to let us in.
Do you work for landlords and businesses?
Yes, regularly. We can quote for several properties at once.
Which products do you use?
It depends on the joint: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. Brands we use include Arbo and Everbuild.
Is it worth trying it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Is it possible to take out silicone and use sand mastic instead?
In most cases. We remove the silicone and clean the joint, then point it with sand mastic.
Where are you based?
Our base is in Crawley, and we work across South East England, London and Scotland.
What affects the cost of sand mastic
The quote reflects the job in front of us. We take into account:
- The amount of work
- When we can work, for business premises
- Whether there’s mould to deal with
- The number of rooms or windows
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether the work is at height. We take all of that into account in your quote.
What to tell us for a quote
What to tell us when you ask for a quote:
- The rough size of the job
- Access, such as stairs, a lift or height
- Pictures of the joints, sent by email
- The problem you’ve noticed
Getting a quote is simple: let us know what needs doing and where and its rough size. Photos by email help us understand the job.