Greater London · England
New Addington Sand Mastic
Specialist sand mastic for New Addington: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Old sand mastic that has cracked, crumbled or fallen out
- A silicone bead on a sash window that spoils the look
- Gaps where the frame meets the masonry
Sand mastic in New Addington, done properly
We work across New Addington renewing sand mastic on sash windows and doors. Every joint is cleaned out and filled by hand, finished to suit the masonry. If you have crumbling sand mastic round a window and mastic worn away on windows facing the weather, we can help, whatever the surface.
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, in New Addington as anywhere.
You are covered for a year from the day we finish. If there’s a problem with it, please phone 0345 464 0079 or send us an email.
- Where
- New Addington (CR0, CR9)
- Region
- Greater London
- Cover
- 12 months on all our work
- Quote
- A clear price before we start
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
New Addington: your questions answered
I let a flat near Hayes (Kent) station. Can you help?
Yes, rental work is part of what we do. You can phone 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before we start.
Is parking an issue for sand mastic in New Addington?
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.
Can sand mastic be painted?
It’s traditionally left unpainted, which is what traditional guidance recommends. Ask us before decorating.
How do I get a quote for sand mastic in New Addington?
Size, access and the old material all affect the cost. Call for a quick quote.
Will you leave a mess?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.
Can you replace silicone on a period window with sand mastic?
Yes, it’s a common request. The old silicone has to come out completely so the mastic beds in well.
Can new sealant go over the old?
No. New silicone will not bond to old silicone, and it traps any mould or water underneath. We remove it all first.
Can you do several jobs on one visit?
Yes, and it often makes sense. Combining jobs makes good use of the visit.
Towns and villages near New Addington
Also in New Addington
What sealant work cannot fix
To be straight with you, some problems need a different trade:
- Cracked or broken glass
- Whether work needs listed building consent
- Decayed frames that need repair
If you’re not sure, just call 0345 464 0079 or email us and we’ll give you a straight answer before you book.
Where we work in New Addington
- Tenement windows
- Stone surrounds
- Brick reveals
- Timber door frames
- Sash and case windows
- Period & listed homes
Work for landlords, hotels and businesses
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements.
Should I try it myself first?
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. All the old material has to come out first.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
How to look after the new joints
Joint life depends on how it’s used and looked after. We suggest:
- Get any rot dealt with first
- Ask the planning authority about consent for listed or conservation-area homes
- Go gently near the mastic when preparing windows
- Keep modern sealant off the mastic
Look at the mastic when you look over the windows. Catching cracks early keeps repairs small.
Small cracks are a sign the mastic is ageing. Renewing it then is simpler than waiting until it falls out.
Sand mastic in New Addington: local notes
Historic houses like Addington Palace (about 1.5 miles north-west) are a reminder that the area around New Addington has older buildings as well as new. 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.
Managing a site like Rowdown Primary School? Then larger buildings have plenty of frames, and the mastic around each one ages. Homes close to St Edward King and Confessor include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. New Addington is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
New Addington is about 4 miles south-east of Croydon, in Greater London. Whether you’re in the middle of New Addington or further out, sand mastic is available for homes and businesses alike. New Addington is one of 764 towns and villages in Greater London where we work. Our London page covers work nearby (11 miles or so).
We work across CR0 and CR9 for sand mastic and the streets around it. Whether your property is on Bothwell Road, Windham Avenue and Gascoigne Road or a nearby road, we can help. Close by, we work in Forestdale (1 mile west), Fickleshole (1 mile south), Addington (1 mile north-west), Farleigh (1 mile south-west) and Selsdon (2 miles west). Within a short drive, we also cover London (11 miles north), City of Westminster (13 miles north-west), Marylebone (13 miles north-west), Kensington (14 miles north-west), St Pancras (13 miles north) and Shoreditch (13 miles north).
Local landmarks in New Addington
In New Addington, that means homes and buildings near Meridian High School and Addington Vale, among other places. New Addington’s nearest station is Hayes (Kent) station, roughly 2.6 miles north-east. Other landmarks nearby include Warlingham Park Hospital (1.8 miles south) and Bethlem Museum of the Mind (3.3 miles north-east). The countryside around New Addington includes Nore Hill and Hutchinson's Bank.
Quotes for sand mastic in New Addington
There’s no set price list. The quote depends on:
- The number and length of the joints
- Working hours on commercial sites
- Access and height
- The old material and how stubborn it is
The cost reflects the work involved, not a rough estimate. That is why we ask a few questions first.
What we need to know
Photos help, but a description is a good start. Please mention:
- How many joints, rooms or windows are involved
- What the problem is, such as mould, gaps, leaks or cracking
- Access, such as stairs, a lift or height
- If someone has resealed it before
To get a quote, ring 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. We will give you a clear price before any work starts.
How the visit works
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 the area is left clean. In New Addington, 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.
- We finish the mastic to a tidy line.
Preparing for the visit
- For indoor joints, keep the area dry beforehand if you can
- Clear the area around the work
- Let us know about earlier repairs to the joints
Getting a quote
For sand mastic in New Addington, ring 0345 464 0079 or drop us an email. Tell us what the problem is and where, and we will agree the price before any work begins.
Related advice
What the job involves on each surface
Sash and case windows
A sash window’s box frame sits in the masonry opening. Sand mastic seals the joint round it.
Tenement and terrace windows
Tenements and terraces often have many sash windows with ageing mastic. We can do one window or several.