Greater London · England
Sand Mastic in Bell Green
Professional sand mastic in and around Bell Green, with every bit of old sealant taken out first.
- Draughty sash windows at the surround
- Mastic dropping out of the joint
- Silicone on a period window that looks wrong
What affects the quote in Bell Green
We don’t publish a price list, because jobs vary so much. What we look at:
- How many rooms, windows or areas are involved
- Any mould that needs treating
- Working hours on commercial sites
- The size of the job
The cost depends on the size of the job, how hard the old material is to remove and access to the work. You’ll have a clear quote before any work starts.
What we need to know
Photos help, but a description is a good start. Please mention:
- Whether it has been sealed before
- Photos by email, if that’s easy
- What the problem is, such as mould, gaps, leaks or cracking
- How many joints, rooms or windows are involved
We don’t publish a price list, as no two jobs are quite the same. Instead, we give you a clear price for your job. To get started, call 0345 464 0079 or send us an email.
About our sand mastic in Bell Green
Fresh sand mastic forms a skin quite soon, but it takes longer to harden fully. Traditional guidance is not to paint over it and we’ll advise if you’re redecorating. We work on stone surrounds, tenement windows and sash and case windows, and people most often call us about old sand mastic that has cracked, crumbled or fallen out and draughts and rain around sash boxes.
Much of London’s older housing was built with timber sash windows, some still in place and some long since replaced. Either way, the mastic between frame and brickwork is what stops draughts and rain getting in.
You are covered for a year from the day we finish. If anything is not right with it, ring 0345 464 0079 or email us.
- Where
- Bell Green (SE6, SE26, SE23)
- Wider area
- Greater London
- Cover
- A year, on every job
- Quote
- A clear price before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
DIY versus a professional finish
If you are set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
Leave it or put it right?
Replacing sash windows is a big decision for a period home and on a listed home, consent may be needed. If the frames are sound, renewing the mastic deals with gaps and draughts at the surround. In a flat in Bell Green, failed sealant seldom stays inside your own four walls: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
Doing several joints on one visit is normally more efficient than separate visits. We’ll give you a clear price for the lot.
Why us?
- Quality sealants from Arbo and Everbuild
- A 12-month guarantee on all work
- More than 20 years in sealant work
- Neat joints and a tidy finish
Different surfaces, different methods
Sash and case windows
Most of our sand mastic work is on sash windows. We renew the mastic round each box.
Tenement and terrace windows
In shared buildings, the windows may be part of a wider repair, so check who is responsible first.
Also near Bell Green
Also in Bell Green
Honest limits
A few problems are outside what sealant work can do:
- Cracked or broken glass
- Sash cords, weights and draught-proofing of the sashes
- Whether work needs listed building consent
Not sure which it is? You can phone 0345 464 0079 or send us an email and we will tell you honestly before you book.
Where we work in Bell Green
- Brick reveals
- Tenement windows
- Period & listed homes
- Stone surrounds
- Sash and case windows
- Timber door frames
Common questions in Bell Green
Can you do sand mastic in Bell Green?
Yes, Bell Green is within the area we cover. Our work covers London and the South East. You can ring 0345 464 0079 or send us an email and tell us what needs doing, and we’ll give you a clear price.
I let a flat near Lower Sydenham 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’ll give you a fixed price before work begins.
Do you take out the old sealant first?
Always. Sealing over old sealant is the main reason resealing fails early, so we never do it.
How long will you be here?
Typically it takes anything from a few hours to a full day, depending on how many windows. Larger jobs naturally take longer, and we’ll say how long yours will take.
Where do you work from?
We work from Crawley. Our applicators cover Bell Green.
Are you insured?
Yes. We are fully insured, and we can confirm the details when we quote.
Are you ARBOMaster approved?
Yes. We’re an ARBOMaster approved applicator.
Is consent needed for window work on a listed home?
Your local planning authority is the one to ask. They’ll tell you if consent is needed.
Frames and glazing around Bell Green
With historic houses such as Kingswood House (about 2.1 miles west) nearby, there’s older building stock in the area around Bell Green as well as newer homes. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window. Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Schools such as Haseltine Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages. If you let a flat or house near Lower Sydenham station, any sash windows need sound mastic to keep draughts and rain out. As a London address, Bell Green can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Bell Green is about 3 miles south of New Cross, in Greater London. Across the SE6 area, our applicators can take on sand mastic. Bell Green is one of 764 places in Greater London we cover for sand mastic.
Every address in SE6, SE26 and SE23 is covered for sand mastic. If you need sand mastic at a property on Mayow Road, Wynell Road and Paxton Road or a nearby road, our applicators can take on the job. You’ll find Bell Green on the A2218, which makes it straightforward to reach. If you’re just outside Bell Green, we cover Bellingham (1 mile east), Southend (1 mile east), Perry Vale (1 mile north-west), Sydenham (1 mile south-west) and Catford (1 mile north-east). We also work in nearby towns such as London (5 miles north-west), City of Westminster (8 miles north-west), Marylebone (8 miles north-west), Kensington (9 miles north-west), St Pancras (8 miles north-west) and Shoreditch (7 miles north).
Local landmarks in Bell Green
Around Bell Green, our work takes us to homes and buildings near Allenby Tutorial Trust, Mayow Park and Fellowship Inn and the streets around them. Bell Green has its own railway station: Lower Sydenham station. Nearby you will also find Lewisham Shopping Centre (2.3 miles north-east) and Horniman Museum and Gardens (1.4 miles north-west). For a walk, there’s Dacres Wood and Knight's Hill.
The process
We work through the job in order: protection first, then preparation, sealing and a tidy-up. For most jobs that takes a few hours for a single window, longer for several and we leave things clean and tidy. In Bell Green, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- Each surround is checked first.
- The joint is raked out and cleaned.
- We fill deep gaps so the new mastic is not too thick.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
Preparing for the visit
- Let us know about earlier repairs to the joints
- Tell us about any water getting in
- Clear the area around the work
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.
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Landlord and commercial work in Bell Green
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together, and we’re fully insured for the work.
If you manage several properties in or around Bell Green, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs.