Greater London · England
Sand mastic for sash & case windows in Widmore, Greater London
Specialist sand mastic for Widmore: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Mastic that needs renewing before redecorating
- Draughty sash windows at the surround
- A silicone bead on a sash window that spoils the look
What sealant work cannot fix
New sealant cannot fix everything, and we will tell you before we start. Sealant will not put right:
- Putty and glazing repairs
- Sashes that need overhauling
- Masonry that needs repairing
If you are not sure, just phone 0345 464 0079 or email us and we will give you a straight answer.
What we seal
- Period & listed homes
- Timber door frames
- Stone surrounds
- Sash and case windows
- Brick reveals
- Tenement windows
About our sand mastic in Widmore
Traditional burnt sand mastic that sits naturally against stone and brick. It’s a good fit for period properties where a modern sealant bead would stand out. If you have draughty sash windows at the surround and old sand mastic that has cracked, crumbled or fallen out, we can put it right, on stone surrounds, sash and case windows and tenement windows alike.
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.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Location
- Widmore (BR1, BR2, BR7)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Questions from Widmore
Can you do sand mastic in Widmore?
Yes, Widmore is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or email us and tell us what needs doing.
Is parking an issue for sand mastic in Widmore?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. That way the visit can be planned around it.
What information do you need?
A short description and the location, with pictures by email if possible. If we need more, we’ll ask.
Is it possible to paint over sand mastic?
Traditional guidance is not to paint over sand mastic. If you are redecorating the window, ask us first and we will talk you through it.
Where is Mr Mastic based?
Our base is Crawley. Our area covers South East England, London and Scotland.
How long does sand mastic take?
It depends on the size of the job, but as a guide it takes anything from a few hours to a full day, depending on how many windows. We’ll tell you when we quote.
Do I need to be at home?
It depends on the job. Inside work needs someone to give us access.
Can you work on commercial sites?
Yes. We work in offices, washrooms, hotels and other commercial premises. We can talk about working times when we quote.
Work for landlords, hotels and businesses
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
We regularly work with letting and managing agents. Tell us the address, the job and how access works.
Surface by surface
Timber door frames
Round a period front door, sand mastic gives the right look.
Sash and case windows
The mastic round a sash window is on show so we finish it carefully.
Other services in Widmore
Aftercare tips
To keep the joints looking good and working properly:
- Inspect the joints round the windows every year or so
- Get any rot dealt with first
- Sort the mastic before the decorators arrive
- Make sure water runs off the sill
Avoid sealing over the mastic with silicone. If anything cracks, get it looked at rather than patching it.
Crumbling mastic lets rain into the joint. That water can reach the timber frame and the wall so early renewal protects both.
The process
At the end, we look at the finished work together. The work normally takes a few hours for a single window, longer for several, depending on the size of the job. For a job in Widmore, parking and access are the things to plan: let us know about parking, the floor we’ll be working on and any lift or shared entrance.
- 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.
- The sand mastic is mixed and pressed into the joint by hand.
- The surface is finished to suit the stone or brick.
Before we arrive
- Let us know about parking restrictions
- Let us know about earlier repairs to the joints
- Clear items away from the joints we are working on
Ask for a quote
Getting a quote is simple: tell us what needs doing and where. Photos by email help us understand the job.
Read more
What sand mastic looks like in Widmore
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.
If you look after a building such as Bullers Wood School for Boys, larger buildings have plenty of frames, and the mastic around each one ages. If you let a flat or house near Bickley station, older sash windows in a rental need their mastic kept sound to keep the weather out. Widmore is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Widmore is about 1 mile east of Bromley, in Greater London. Whether you are in the middle of Widmore or further out, sand mastic is available for homes and businesses alike. Widmore is one of 764 places in Greater London we cover for sand mastic. London is on our list too, around 9 miles away.
Jobs for sand mastic in BR1, BR2 and BR7 works the same way as everywhere else we cover. Sand mastic is available to properties on Golf Road, The Avenue and Canon Road. Close by, we work in Bickley (1 mile north), Elmstead (1 mile north), Chislehurst (1 mile north-east), Bromley (1 mile west) and Sundridge (1 mile north-west). Larger places within reach include London (9 miles north-west), City of Westminster (12 miles north-west), Marylebone (12 miles north-west), Kensington (13 miles north-west), St Pancras (11 miles north-west) and Shoreditch (10 miles north-west).
Local landmarks in Widmore
Locally, jobs take us to homes and businesses close to Bird In Hand Public House, St George's and Jubilee Country Park. There’s a railway station in Widmore itself: Bickley station. Other landmarks nearby include Bridgeways Day Hospital (1 mile south) and The Mall (1.3 miles west). Open spaces near Widmore include Summer Hill and The Tarn.
Can I do it myself?
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly.
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
Leave it or put it right?
Not every filler suits an old window surround. Sand mastic matches what was there and that can be important for listed homes. In a London flat, a failed joint rarely stays your problem alone: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
There are no prices on our website, because the cost depends so much on the job itself. For a quick quote, please ring 0345 464 0079 or drop us an email and we’ll talk you through it.
Why us?
- Neat joints and a tidy finish
- Homes, businesses and hotels
- Trusted Arbo and Everbuild sealants
- Anti-fungal silicone where joints get wet
Read what affects the cost and our reviews.