Greater London · England
Sand mastic for sash & case windows in Sundridge, Greater London
Sand mastic for Sundridge, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Silicone on a period window that looks wrong
- Gaps where the frame meets the masonry
- Mastic worn away on windows facing the weather
Sand mastic in Sundridge, done properly
Sand mastic is the traditional way to point the gap between a timber window frame and the stone or brick around it. It’s a mix of sand and a linseed-oil-based binder, applied by hand. On period homes, it looks right where silicone wouldn’t. If you have cement or filler used on old window joints that has cracked and draughty sash windows at the surround, we can put it right, whatever the surface.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. Over the years, the sealant around them shrinks, cracks and pulls away, letting in draughts and water.
All our work comes with a one-year guarantee, wherever you are in Greater London.
- Where
- Sundridge (BR1, BR7, BR2)
- Region
- Greater London
- Guarantee
- A year, on every job
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Surface by surface
Period and listed homes
A traditional finish suits a period property, and sand mastic is one of them.
Tenement and terrace windows
Upper-floor windows need access planning. Let us know the floor and we’ll confirm access.
When something else is needed
We will not take on work that will not last, so these are the limits:
- Rotten sashes, sills or window boxes (a joiner’s job)
- Masonry that needs repairing
- Decisions on consent for listed homes
If you are not sure, just ring 0345 464 0079 or drop us an email and we will give you a straight answer before booking.
What we seal
- Sash and case windows
- Brick reveals
- Timber door frames
- Period & listed homes
- Stone surrounds
- Tenement windows
Your questions about sand mastic in Sundridge
Can you help a landlord with a rental near Sundridge Park station?
Yes, landlords and agents are among the people we work for. You can ring 0345 464 0079 or drop us an email with the details for a clear quote.
Do you cover Sundridge for sand mastic?
Yes, Sundridge is within the area we cover. Our work covers London and the South East. Just ring 0345 464 0079 or send us an email with a few details of the job.
Will you leave a mess?
No. We protect the surfaces around the joints, and we tidy up before we go.
What should I tell you?
Only a few details: where it is, what you’ve noticed and how we reach it. After that, simply ring 0345 464 0079 or drop us an email.
Do the sealants smell?
That depends on the sealant. Some smell for a while, some hardly at all.
Can you do several jobs on one visit?
Yes, we can. Several rooms, windows or areas can go on one quote.
Where do you work from?
Our base is Crawley. We work across South East England, London and Scotland.
Are you an approved applicator?
Yes. We hold ARBOMaster approved applicator status.
Windows and doors in Sundridge
Historic houses like Bromley Palace (about 0.9 miles south) are a reminder that the area around Sundridge has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For site and facilities teams at buildings such as St Joseph's Catholic Primary School, the mastic around its windows and doors needs looking after like any other building’s. For an older house near a landmark such as St Andrew, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Sundridge is about 1 mile north-east of Bromley, in Greater London. Across the BR1 area, we cover sand mastic for homes and businesses. 764 places in Greater London are on our list, from the larger towns to small villages. London is on our list too, about 8 miles from Sundridge.
Postcode districts we cover here for sand mastic: BR1, BR7 and BR2. You will find streets such as Hawes Road, North Road and Croft Road, all of which we cover. Other places close to Sundridge include Plaistow (1 mile west), Grove Park (1 mile north), Downham (1 mile north-west), Chinbrook (1 mile north) and Elmstead (1 mile east). Further out, we also cover London (8 miles north-west), City of Westminster (10 miles north-west), Marylebone (10 miles north-west), Kensington (11 miles north-west), St Pancras (10 miles north-west) and Shoreditch (9 miles north-west).
Landmarks near Sundridge
Locally, jobs take us to homes and businesses close to Elmstead Wood, Holy Trinity College Bromley and Haberdashers' Aske's Knights Academy. There’s a railway station in Sundridge itself: Sundridge Park station. Nearby you’ll also find Bromley Hospital (1.4 miles south) and Greenwich Castle (4.4 miles north). Open spaces near Sundridge include Summer Hill and Downham Woodland Walk.
Other services in Sundridge
Landlord and commercial work in Sundridge
For anyone letting property in or around Sundridge, several properties can go on one quote. Just tell us the addresses and what each one needs, and pictures by email help.
We work for landlords and letting agents as well as householders. Sealant work between tenants is a simple way to keep a property in good order.
The process
On the day, we start by going over the job with you, so there are no surprises. We protect the surfaces around the joints before any work starts. Most jobs take anything from a few hours to a full day, depending on how many windows. In Sundridge, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents 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.
- The surface is finished to suit the stone or brick.
Getting ready for the visit
- Let us know about earlier repairs to the joints
- Try not to wet indoor joints just before the visit
- Move anything stored near the joints
Getting a quote
Getting a quote is simple: let us know the job and the location, and roughly how big it is. Photos by email help us understand the job, and we’ll come back to you with a quote.
Related advice
When to call us in Sundridge
Previous repairs in cement or silicone often trap water or crack away. They don’t suit the joint and we normally remove them.
Most people get in touch when they notice something like this:
- Open joints round the window box
- Draughty sash windows at the surround
- Crumbling sand mastic round a window
- Cement or filler used on old window joints that has cracked
Rented homes near Sundridge Park station change hands often, and any sash windows need sound mastic to keep draughts and rain out.
What your quote should include
- How long the guarantee is
- How hidden problems are handled
- What product goes in the joint
- Who does the work, and how experienced they are
DIY sealant or a professional job?
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it doesn’t work out, we can still put it right.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
Why act early in Sundridge
Draughts round a sash window aren’t always the sashes. Gaps between the frame and the wall can be just as bad and new mastic seals them. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and by the time it shows on a wall or ceiling in Sundridge, the repair is bigger than the sealant job would have been.
The cost depends on the size of the job, how hard the old material is to remove and how easy the joints are to reach. We give a clear quote before work begins, so you know where you stand.
Why us?
- Trusted Arbo and Everbuild sealants
- Anti-fungal silicone where joints get wet
- We leave the area clean and tidy
- We are fully insured
See our cost guide or customer reviews.