Greater London · England
Sand mastic for sash & case windows in London Fields, Greater London
Our applicators work in London Fields on traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Crumbling sand mastic round a window
- Cement or filler used on old window joints that has cracked
- Modern sealant on a period surround
About our sand mastic in London Fields
Across London Fields, we renew sand mastic around sash and case windows. Every joint is cleaned out and filled by hand, finished to suit the masonry. Common call-outs are for mastic that needs renewing before redecorating and mastic dropping out of the joint, across timber door frames, period & listed homes and sash and case windows.
London’s Victorian and Edwardian terraces were built with timber sash windows, and many still have them or their replacements. Either way, the mastic between frame and brickwork is what stops draughts and rain getting in.
A 12-month guarantee comes as standard, so you are not left on your own once the job is done.
- Location
- London Fields (E8, E2, E9)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Aftercare tips
No joint lasts for ever, but care makes a real difference. Our tips:
- Check the mastic when you check the paintwork
- Have rotten timber repaired before new mastic goes in
- Avoid heavy scraping on the mastic joint
- Renew mastic before redecorating the windows
Leave the new mastic unpainted, which is the traditional advice. Ask us before any decorating around it.
An open joint round the box lets weather through. The longer it’s left, the more the joint opens as more mastic falls out.
The process
You don’t need to clear the whole room or building before we come, just the space around the work. Everything nearby is protected, and the job takes a few hours per window, depending on the condition of the joints for a typical job. In London Fields, flats, stairs and shared entrances are part of the routine. If the building has a concierge, managing agent or access rules, tell us when you book.
- Each surround is checked first.
- 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.
How to prepare
- For indoor joints, keep the area dry beforehand if you can
- Mention any leaks or damp you’ve noticed
- Clear the area around the work
How to get a quote
We quote each job on its own. Simply phone 0345 464 0079 or send us an email and describe the job, and photos are welcome.
Related advice
Quotes for sand mastic in London Fields
For a quick quote, just ask. The main things that affect it are:
- Any mould that needs treating
- Which sealant suits the joint
- How many rooms, windows or areas are involved
- Any working-time requirements on site
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote.
What we need to know
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- Any access issues, like height or stairs
- If it’s domestic, commercial or a hotel
- Where the property is
- What’s wrong with the joints now
Getting a quote is simple: let us know the job and the location. A few pictures by email make the job easier to understand, and we will come back to you with a quote.
FAQs for London Fields
Is parking a problem for a job in London Fields?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Do you cover London Fields for sand mastic?
Yes, London Fields is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or drop us an email with a few details of the job.
Will it make a mess?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.
Do you work for letting agents?
Yes. We work for homeowners, landlords, letting agents, businesses and hotels in London Fields.
What sealant do you use?
Products from Arbo and Everbuild, among others, chosen to suit the joint. We explain the product when we quote.
Can I do it myself?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs.
When will the new mastic be hard?
It forms a skin fairly soon, then hardens over a longer period. Timing depends on the weather and the joint.
Where do you work from?
Mr Mastic is based in Crawley. We cover London Fields and the rest of Greater London.
Signs you need sand mastic in London Fields
Water gets into small cracks in the mastic and loosens it further. Windows facing the weather tend to go first.
Keep an eye out for these signs:
- Crumbling sand mastic round a window
- Gaps round a timber door in stone or brick
- Modern sealant on a period surround
- Weathered mastic on the most exposed windows
For site and facilities teams at buildings such as Gayhurst Community School, the mastic around its windows and doors needs looking after like any other building’s.
Questions to ask before booking
- What happens if they find a problem under the old sealant
- Whether the sealant suits the joint
- The length of the guarantee
- Whether VAT is included
Towns and villages near London Fields
Other services in London Fields
What we cannot put right
It helps to know what we cannot do:
- Putty and glazing repairs
- Masonry that needs repairing
- Whether work needs listed building consent
Not sure which it is? You can call 0345 464 0079 or send us an email and we will tell you honestly before you book.
Surfaces we seal
- Period & listed homes
- Stone surrounds
- Brick reveals
- Timber door frames
- Sash and case windows
- Tenement windows
Should I try it myself first?
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
What the job involves on each surface
Sash and case windows
Sash windows are where we do most sand mastic work. Each joint round the box is raked out and renewed.
Timber door frames
A neat sand mastic joint round a front door suits a period home.
Sand mastic in London Fields: local notes
In London conversions and blocks, the lease decides who is responsible for the frames, so it’s worth checking before booking. With historic houses such as Sutton House (about 0.7 miles north-east) nearby, there’s older building stock in the area around London 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.
Rented homes near London Fields station change hands often, and cracked sand mastic around sash windows lets in the draughts tenants complain about. London Fields is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
London Fields is about 1 mile east of Hoxton, in Greater London. Our applicators cover sand mastic for homeowners, landlords and businesses in London Fields, as part of our work across Greater London. Across Greater London, we cover 764 places, and London Fields is one of them.
Our applicators cover all of the E8, E2 and E9 postcode area for sand mastic. Streets in the area include Tudor Road, Forest Road and Duncan Road. London Fields is on the A1207, which makes it straightforward to reach. Neighbouring places we cover for sand mastic include Hackney Central (1 mile north), Cambridge Heath (1 mile south-east), Dalston (1 mile north-west), Hackney (1 mile north-east) and Kingsland (1 mile north-west). Further out, we also cover London (3 miles south-west), City of Westminster (4 miles south-west), Marylebone (4 miles south-west), Kensington (7 miles south-west), St Pancras (3 miles west) and Walthamstow (4 miles north-east).
Landmarks near London Fields
Locally, jobs take us to homes and businesses close to The Urswick School, Haggerston Park and Bishopsgate Institute Special Collections and Archives, among other places. Other local landmarks include The Dolphin pub (under half a mile east) and The Urswick School - A Church of England Secondary School (within half a mile north-east). There’s a railway station in London Fields itself: London Fields station. A little further out are German Hospital (0.6 miles north-west) and Hackney Walk (0.7 miles north-east). Green spaces nearby include Old Ford Island and Tower Hill.