Greater London · England
Sand Mastic in Leaves Green
Window and door surrounds in Leaves Green need attention? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Old cement repairs round a window that have failed
- Old sand mastic that has cracked, crumbled or fallen out
- Wind and rain getting in round a sash window
Sand mastic for homes and businesses in Leaves Green
We work across Leaves Green renewing sand mastic on sash windows and doors. Every joint is cleaned out and filled by hand, finished to suit the masonry. We work on tenement windows, period & listed homes and brick reveals, and the jobs we see most are draughts and rain around sash boxes and gaps between timber frames and stone or brick.
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, in Leaves Green as anywhere.
Whatever the size of the job, you get the same 12-month guarantee.
- Where
- Leaves Green (BR2)
- Region
- Greater London
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
How we quote for sand mastic
The quote reflects the job in front of us. We look at:
- The old material and how stubborn it is
- Which sealant suits the joint
- Access and height
- Whether there’s mould to deal with
Every job is a little different, so each one gets its own quote. Size, access and the product the joint needs all make a difference.
What we need to know
To help us quote quickly, please include:
- The rough size of the job
- The address or postcode of the job
- Pictures of the joints, sent by email
- The type of property
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and email photos if that is easy.
Your questions about sand mastic in Leaves Green
Do you cover Leaves Green for sand mastic?
Yes. Our work covers London and the South East, and Leaves Green is part of that. Just ring 0345 464 0079 or send us an email with a few details of the job, and we will give you a clear quote.
Can you help a landlord with a rental near Hayes (Kent) station?
Yes. We work for letting agents and landlords as well as householders. You can phone 0345 464 0079 or send us an email with the details for a clear quote.
Where do you work from?
We work from Crawley. Our applicators cover Leaves Green, along with the rest of our area.
Do you remove the old sealant?
Yes. All of the old material is cut out and the joint cleaned.
Can you work on commercial sites?
Yes. We can plan bigger jobs in stages to suit the site.
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 for work to your windows.
How long does sand mastic take?
A typical job takes a few hours for a single window, longer for several. We will confirm how long when we quote.
Which products do you use?
Products from Arbo and Everbuild, among others, picked for each joint. We explain the product when we quote.
Places near Leaves Green
More services for Leaves Green
What we can’t put right
Honest advice matters more to us than a booking, so here’s what sealant can’t fix:
- Decayed frames that need repair
- Decisions on consent for listed homes
- Putty and glazing repairs
If in doubt, ring 0345 464 0079 or email us and we will say what we think before you book.
Where we work in Leaves Green
- Stone surrounds
- Tenement windows
- Brick reveals
- Timber door frames
- Sash and case windows
- Period & listed homes
What we do, step by step
The work is kept neat and contained to the area we are working on. The job generally takes a few hours per window, depending on the condition of the joints, and we tell you how long to leave it before we go. In Leaves Green, as in most of London, parking needs a little planning. It helps if you can point us to a visitor permit or a bay close to the door.
- We look at the surrounds with you and agree the joints to renew.
- We remove the old, loose mastic.
- Deep gaps are packed so the mastic sits at the right depth.
- We apply the mastic by hand and shape it.
- We dress the finish so it sits neatly against the masonry.
Getting ready for the visit
- Keep children and pets away from the work area
- Clear items away from the joints we are working on
- Mention any tricky access
Getting a quote
Want a quote for sand mastic? Please ring 0345 464 0079 or email us with a few details. We’ll explain what we’d do and send you a clear quote before any work starts.
Read more
Why act early in Leaves Green
A silicone bead can be quicker, but it can look wrong on a period surround. Sand mastic is the traditional material and blends with the stone or brick. Converted houses in London often have a bathroom above someone else’s living room, and a slow leak from a failed seal can end up in the flat below. Putting it right early is much less trouble.
Instead of a standard rate, we look at what your job involves: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
Why us?
- Quality sealants from Arbo and Everbuild
- We are fully insured
- Old sealant always removed completely
- 180+ five-star Google reviews
Take a look at how sealant jobs are priced and customer reviews.
Windows and doors in Leaves Green
With historic houses such as Down House (about 1.1 miles east) nearby, there’s older building stock in the area around Leaves 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, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Letting a property close to Hayes (Kent) station? Then any sash windows need sound mastic to keep draughts and rain out. Leaves Green is in London, so parking needs planning: let us know about parking bays, permits or a driveway. In the older streets around Keston Parish Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Leaves Green is about 4 miles south of Bromley, in Greater London. If you need sand mastic in Leaves Green, please ring 0345 464 0079 or send us an email for a quick quote. We’re based in Crawley and cover Greater London. 764 places in Greater London are on our list, from the larger towns to small villages. You can also see our page for London, roughly 12 miles from Leaves Green.
Every address in BR2 is within our area for sand mastic. We cover properties on Ashmore Lane and Main Road and the roads around them. If you’re just outside Leaves Green, we cover Farthing Street (1 mile north-east), Downe (1 mile east), Nash (1 mile north-west), Luxted (1 mile south-east) and Keston (2 miles north). Within a short drive, we also cover London (12 miles north-west), City of Westminster (15 miles north-west), Marylebone (15 miles north-west), Kensington (15 miles north-west), St Pancras (14 miles north-west) and Shoreditch (14 miles north).
Local landmarks in Leaves Green
Typical jobs here are in homes near The Kings Arms and South Park. The closest station to Leaves Green is Hayes (Kent) station, roughly 2.8 miles north of the centre. Other landmarks nearby include Bethlem Museum of the Mind (3 miles north) and Princess Royal University Hospital (2.2 miles north-east). The countryside around Leaves Green includes Nore Hill and West Kent Golf Course nature reserve.
Keeping the joints in good condition
After the cure time, these simple habits help:
- Look over the window mastic once a year
- Clear gutters so water does not pour onto the windows
- Do not paint over the new mastic
- Sort the mastic before the decorators arrive
Do not touch or press the mastic while it hardens. It forms a skin fairly soon, but takes longer to harden fully.
Crumbling mastic lets rain into the joint. That water can reach the timber frame and the wall so early renewal protects both.
Surface by surface
Stone surrounds
Stone surrounds suit sand mastic well. It finishes to look like part of the surround.
Period and listed homes
A traditional finish suits a period property.
Can I do it myself?
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is.