Greater London · England
Sand Mastic in New Charlton
Professional sand mastic in and around New Charlton, with every bit of old sealant taken out first.
- Failed mastic on an exposed elevation
- Wind and rain getting in round a sash window
- Gaps where the frame meets the masonry
Sand mastic in New Charlton, done properly
Our applicators renew the sand mastic around sash and case windows and doors in stone and brick. Out comes the old, loose mastic, and new mastic is applied and shaped by hand. We work on tenement windows, stone surrounds and brick reveals, and common reasons people get in touch are gaps round a timber door in stone or brick and gaps where the frame meets the masonry.
Many London homes are flats, with windows high above the street. Who looks after the outside of the frames can depend on the lease, so check that first, and access in New Charlton is something to talk through when you book.
The work is guaranteed for twelve months. If something is not right with it in that time, tell us and we’ll put it right.
- Where
- New Charlton (SE7, SE18, E16)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
When to call us in New Charlton
Timber frames move with the seasons. That movement opens up the mastic joint little by little.
If you can see any of these, it’s time to have the joints looked at:
- Window mastic to renew ahead of painting
- Draughty sash windows at the surround
- Mastic dropping out of the joint
- Patchy fillers round a sash window
For site and facilities teams at buildings such as Royal Greenwich Trust School, larger buildings have plenty of frames, and the mastic around each one ages.
Questions to ask before you book
- Who does the work, and how experienced they are
- Is the old sealant removed completely?
- Whether you can choose the colour
- What the quote includes, VAT included or not
Frames and glazing around New Charlton
With historic houses such as Queen's House (about 1.8 miles west) nearby, there’s older building stock in the area around New Charlton as well as newer homes. 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 check that before you book.
As a London address, New Charlton can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. Letting a property close to Charlton station? Then any sash windows need sound mastic to keep draughts and rain out.
New Charlton is about 2 miles north-east of Greenwich, in Greater London. For sand mastic in and around New Charlton, please phone 0345 464 0079 or send us an email for a quick quote. We cover Greater London from our Crawley base. Across Greater London, we cover 764 places, and New Charlton is one of them. There’s also a page for London, about 6 miles away.
Work in SE7, SE18 and E16 works the same way as everywhere else we cover. Whether your property is on Floyd Road, Priolo Road and Hasted Road or a nearby road, we can help. Neighbouring places we cover for sand mastic include Charlton (1 mile south-east), Westcombe Park (1 mile south-west), Woolwich (1 mile east), Vanbrugh Park Estate (1 mile south-west) and Maze Hill (2 miles south-west). Larger places within reach include London (6 miles west), City of Westminster (8 miles west), Marylebone (8 miles west), Kensington (10 miles west), St Pancras (7 miles west) and Shoreditch (5 miles north-west).
What’s near New Charlton
Locally, jobs take us to homes and businesses close to Thames Barrier Park, Thorntree Primary School and The Victoria pub. New Charlton has its own railway station: Charlton station. Nearby you’ll also find Charlton Athletic Museum (under half a mile south) and Greenwich Castle (1.9 miles south-west). Not far away are Gilbert's Pit.
When something else is needed
Sealant is not the answer to every problem, and we will tell you before work begins. Sealant won’t put right:
- Whether work needs listed building consent
- Sashes that rattle, stick or will not open
- Masonry that needs repairing
Not sure which it is? You can call 0345 464 0079 or email us and we’ll tell you honestly.
Surfaces we seal
- Period & listed homes
- Brick reveals
- Stone surrounds
- Sash and case windows
- Timber door frames
- Tenement windows
What affects the cost of sand mastic
We quote each job individually. This is what makes a difference:
- The size of the job
- How many rooms, windows or areas are involved
- When we can work, for business premises
- Whether old sealant or filler has to be cut out
The cost reflects the work involved, not a rough estimate. That is why we ask a few questions first and give you a clear price before we start.
What to tell us for a quote
When you contact us, it’s useful to know:
- How many joints, rooms or windows are involved
- Any previous sealing or DIY work
- If it’s domestic, commercial or a hotel
- How we’d reach the joints
Want a quote for sand mastic? Please call 0345 464 0079 or send us an email and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.
DIY sealant or a professional job?
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Surface by surface
Timber door frames
Round a period front door, sand mastic gives the right look.
Tenement and terrace windows
In shared buildings, the windows may be part of a wider repair so it’s worth checking responsibilities.
Also near New Charlton
More services for New Charlton
What happens if it’s left?
Filling over old, loose mastic does not last. We remove the loose material first so the new mastic stays put. In London conversions, one flat’s bathroom is often above another flat’s ceiling, and a slow leak from a failed seal can end up in the flat below. Dealing with it early is far simpler for homes in New Charlton.
Doing several joints on one visit is usually more efficient than separate visits. You’ll get one clear quote for the whole job.
What you get with us
- Approved under the ARBOMaster scheme
- A 12-month guarantee on all work
- We’re fully insured
- Homes, businesses and hotels
Read what affects the cost and our reviews.
Questions from New Charlton
Do you cover New Charlton for sand mastic?
Yes. Our work covers London and the South East, and New Charlton is part of that. You can ring 0345 464 0079 or send us an email and tell us what needs doing.
Can you help a landlord with a rental near Charlton station?
Yes, rental work is part of what we do. Just call 0345 464 0079 or email us and tell us about the property, and we’ll give you a clear quote.
Where do you work from?
Mr Mastic is based in Crawley. We cover New Charlton and the rest of Greater London, along with the rest of our area.
Can I do it myself?
Some simple jobs can be done by a careful DIYer. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
What should I tell you?
Just the basics: the address or postcode, what’s wrong and any access issues. After that, simply call 0345 464 0079 or send us an email.
Do you have insurance?
Yes. We’re fully insured.
Is it messy?
Tidy work is part of the job. Nearby surfaces are protected.
Can I choose the sealant colour?
In most cases you can choose. We will explain which colours are available and agree one before any work starts.
What happens on the day
Once we are on site, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. Most jobs then take anything from a few hours to a full day, depending on how many windows. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in New Charlton. 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.
- We rake out the old mastic and clean the joint.
- Large voids are packed out first, so the mastic isn’t too thick.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- The finish is dressed so it sits neatly against the stone or brick.
How to prepare
- Clear the area around the work
- Mention any leaks or damp you’ve noticed
- Tell us about any previous sealing or DIY attempts
Get a quote
To get a quote, phone 0345 464 0079 or drop us an email with the location and a short description of the problem. You’ll have a clear quote before we start.