Greater London · England
Sand mastic for sash & case windows in Hither Green, Greater London
Sand mastic for Hither Green, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Silicone on a period window that looks wrong
- Crumbling sand mastic round a window
- Weathered mastic on the most exposed windows
Sand mastic in Hither Green
Sand mastic has long been used to fill the joint between timber frames and masonry. It’s made from sand and a linseed-oil-based binder, applied by hand. On older homes, it suits the building far better than silicone. We are often asked to deal with mastic dropping out of the joint and gaps where the frame meets the masonry, on sash and case windows, period & listed homes and tenement windows.
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 Hither Green is something to talk through when you book.
The work is guaranteed for twelve months. If something isn’t right with it in that time, tell us and we’ll put it right.
- Place
- Hither Green (SE13, SE12, SE6)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
DIY sealant or a professional job?
If you are set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.
What happens on the day
When we get to you, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. After that, the work takes a few hours per window, depending on the condition of the joints. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. If the building has a concierge, managing agent or access rules, tell us when you book.
- First we agree which joints need doing.
- We remove the old, loose mastic.
- We pack any deep voids first.
- We apply the mastic by hand and shape it.
- We dress the finish so it sits neatly against the masonry.
How to prepare
- Where the joints are inside, avoid wetting them before we arrive
- Keep pets and children clear of the area while we work
- Mention if the joints have been sealed before
Getting a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we’ll talk you through what we’d do. When it suits you, phone 0345 464 0079 or send us an email.
Related advice
Why it’s worth doing now in Hither Green
Not every filler suits an old window surround. Sand mastic matches what was there and that can be important for listed homes. In London conversions, one flat’s bathroom is often above another flat’s ceiling, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Putting it right early is much less trouble.
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. We take all of that into account in your quote.
What you get with us
- Trusted Arbo and Everbuild sealants
- ARBOMaster approved applicator
- 180+ five-star Google reviews
- A 12-month guarantee on all work
Take a look at what affects the cost or our reviews.
Questions from Hither Green
Is parking an issue for sand mastic in Hither Green?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. The visit is then planned around what’s available.
Can you help a landlord with a rental near Hither Green station?
Yes. We work for landlords and agents as well as homeowners. You can ring 0345 464 0079 or drop us an email with the details for a clear quote.
Is sand mastic better than silicone for my windows?
Sand mastic generally suits period timber windows best. On modern frames, we’d normally use a flexible sealant, and we will explain why.
How do I get a quote for sand mastic in Hither Green?
We do not publish prices, because the cost depends on the job: its size, the old material, access and the product needed. You’ll get a clear quote before any work starts.
Do you offer different sealant colours?
Most of the time, yes. We’ll tell you which colours the right product comes in.
What do you need from me for a quote?
Just the basics: the address or postcode, what’s wrong and any access issues. Then ring 0345 464 0079 or email us.
Can you work on commercial sites?
Yes. We can plan bigger jobs in stages.
Should I try DIY first?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Quotes for sand mastic in Hither Green
Jobs vary more than people expect. The main factors:
- Whether the work is at height
- Which sealant suits the joint
- The old material and how stubborn it is
- Any working-time requirements on site
We do not show prices on the website, because each job is priced on what it involves. For a quick quote, please phone 0345 464 0079 or drop us an email.
What to tell us for a quote
Before you ask for a quote, have a think about:
- Access, such as stairs, a lift or height
- The problem you’ve noticed
- Whether it’s a home or a business
- A few pictures by email, if you can
Every job is quoted individually, so the first step is telling us about yours. Just phone 0345 464 0079 or drop us an email with the details.
Honest limits
It helps to know what we cannot do:
- Whether work needs listed building consent
- Putty and glazing repairs
- Crumbling stone or brickwork round the window
Not sure which it is? You can phone 0345 464 0079 or email us and we will tell you honestly.
Where we work in Hither Green
- Period & listed homes
- Tenement windows
- Timber door frames
- Brick reveals
- Stone surrounds
- Sash and case windows
What we’re called out for in Hither Green
Water gets into small cracks in the mastic and loosens it further. Windows facing the weather tend to go first.
The problems people usually mention when they call are:
- Patchy fillers round a sash window
- Weathered mastic on the most exposed windows
- Old sand mastic that has cracked, crumbled or fallen out
- Silicone on a period window that looks wrong
If you live in an older home near Church of St Swithun, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
What to look for in a quote
- How the surfaces are prepared before sealing
- Whether the sealant suits the joint
- Who turns up on the day
- How long to leave it before use
Surface by surface
Timber door frames
Doors face weather and wear and the mastic can crack early. It’s renewed by hand.
Period and listed homes
A traditional finish suits a period property, and sand mastic is one of them.
Also in Hither Green
Sand mastic in Hither Green: local notes
London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking.
Hither Green is in London, so parking needs planning: let us know about parking bays, permits or a driveway. Schools such as Brindishe Manor School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s.
Hither Green is about 2 miles south-east of New Cross, in Greater London. Our applicators cover sand mastic for homes and businesses in Hither Green, as part of our work across Greater London. We cover 764 towns and villages across Greater London.
All of SE13, SE12 and SE6 is covered for sand mastic, from the main roads to the quietest streets. If you need sand mastic at a property on Old Road, Manor Lane and Pascoe Road or anywhere close by, our applicators can take on the job. We also cover Lee (1 mile east), Ladywell (1 mile west), Lewisham (1 mile north-west), Catford (1 mile south-west) and Horn Park (1 mile east). Within a short drive, we also cover London (5 miles north-west), City of Westminster (8 miles north-west), Marylebone (8 miles north-west), Kensington (9 miles west), St Pancras (7 miles north-west) and Shoreditch (6 miles north-west).
Local landmarks in Hither Green
Locally, jobs take us to homes and businesses close to International Academy of Greenwich, The Edmund Halley pub and Manor House Gardens and the streets around them. There’s a railway station in Hither Green itself: Hither Green station. A little further out are Lewisham Shopping Centre (0.9 miles north-west) and University Hospital Lewisham (0.7 miles west). Green spaces nearby include Brookmill Road Local Nature Reserve and Summer Hill.