Greater London · England
South Kenton Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick in South Kenton, with a one-year guarantee on every job. Call for a quick quote.
- Crumbling sand mastic round a window
- Tired mastic found when preparing windows for paint
- Failed mastic on an exposed elevation
Sand mastic in South Kenton, done properly
Our applicators renew the sand mastic around sash and case windows and doors in stone and brick. The old mastic is raked out, the joint is prepared and new mastic is shaped by hand. If you have crumbling sand mastic round a window and mastic worn away on windows facing the weather, we can put it right, on period & listed homes, stone surrounds and sash and case windows alike.
Many London homes are flats, with windows high above the street. In a converted house or block, the lease usually says who is responsible for the windows, so it’s worth checking before booking.
Whatever the size of the job, it’s backed by our one-year guarantee in South Kenton and across Greater London.
- Location
- South Kenton (HA9, HA0, HA3)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Work for landlords, hotels and businesses
In hotels, rooms out of use cost money, so we plan the work room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance that we can handle for you.
Sand mastic in South Kenton: local notes
With historic houses such as Headstone Manor (about 2.6 miles north-west) nearby, there’s older building stock in the area around South Kenton as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
As a London address, South Kenton can be tricky for parking: let us know about parking bays, permits or a driveway. Homes close to Church of the Annunciation include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. For landlords with property near South Kenton station, any sash windows need sound mastic to keep draughts and rain out.
South Kenton is about 1 mile north-west of Wembley, in Greater London. Across the HA9 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. For nearby work, see our London page, about 10 miles away.
Every address in HA9, HA0 and HA3 is within our area for sand mastic, from the main roads to the quietest streets. If you need sand mastic at a property on Peel Road, Holt Road and Byron Road or a nearby road, our applicators can take on the job. Other places close to South Kenton include Northwick Park (1 mile west), Kenton (1 mile north), North Wembley (1 mile south), Brondesbury Park (1 mile south) and Harrow on the Hill (1 mile west). We also work in nearby towns such as London (10 miles south-east), City of Westminster (8 miles south-east), Marylebone (8 miles south-east), Kensington (7 miles south-east), St Pancras (9 miles east) and Shoreditch (10 miles east).
Local landmarks in South Kenton
Around South Kenton, our work takes us to homes and buildings near Windermere pub, Preston Park and Wembley High Technology College. South Kenton has its own railway station: South Kenton station. Nearby you will also find St. Mark's Hospital (0.6 miles north-west) and Kodak Museum (2.2 miles north-west). For a walk, there’s Castlebar Hill and Masons Field.
Why deal with it now?
Not every draught comes from the sashes themselves. Gaps between the frame and the wall can be just as bad, and renewing the mastic closes them. 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.
The cost depends on the amount of work, how much old material has to come out and access to the work. You’ll have a clear quote before any work starts.
Why book with us
- Trusted Arbo and Everbuild sealants
- Fully insured
- A 12-month guarantee on all work
- 180+ five-star Google reviews
Read our cost guide or customer reviews.
Quotes for sand mastic in South Kenton
Jobs vary more than people expect. The main factors:
- Any working-time requirements on site
- Whether the work is at height
- The size of the job
- The number of rooms or windows
No two jobs are quite the same, so each one gets its own quote. Size, access and the product the joint needs all make a difference.
Asking for a quote
There’s no need for technical detail. It helps if you can tell us:
- Pictures of the joints, sent by email
- If someone has resealed it before
- The type of property
- What the problem is, such as mould, gaps, leaks or cracking
If you’re in South Kenton and need sand mastic, ring 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and you’ll get a clear quote before work begins.
DIY versus a professional finish
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
A DIY attempt does not rule out a professional job. We remove it and do the joint properly.
Aftercare tips
Aftercare is simple:
- Plan mastic work ahead of painting
- Clear gutters so water does not pour onto the windows
- Check the mastic when you check the paintwork
- Don’t paint over the new mastic
Look at the mastic when you look over the windows. Catching cracks early keeps repairs small.
Once mastic starts to crumble, rain gets in. It can soak into the frame and the surrounding masonry, so renewing it early is worth it.
Nearby places to South Kenton
What else we do in South Kenton
South Kenton: your questions answered
Is parking a problem for a job in South Kenton?
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.
Do you work for landlords with property near South Kenton station?
Yes. We work for landlords and letting agents as well as homeowners, and several properties can go on one quote. Just phone 0345 464 0079 or send us an email with the address and what needs doing, and we will give you a clear price.
Do I need to be at home?
If the work is inside, we need someone to let us in. Once we’ve agreed the job, you don’t need to watch us work.
Will the old sealant be removed?
Yes. We cut out all the old sealant and clean the joint before resealing.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. We cover South Kenton and the rest of Greater London.
Do you have insurance?
Yes, we are fully insured.
What guarantee comes with the work?
All our work has a one-year guarantee.
When will the new mastic be hard?
Not right away. It skins first and hardens fully later, and we will tell you what to expect.
How the job changes by surface
Brick reveals
Gaps between frame and brick let in rain and draughts. Renewing the mastic closes it.
Sash and case windows
The box of a sash and case window sits in the stone or brick opening. Sand mastic seals the joint round it.
How it works
When we arrive, we look over the joints with you first, so you know exactly what we are doing. Surfaces next to the work are protected before any work begins. Most jobs take 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.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
Getting ready for the visit
- Where the joints are inside, avoid wetting them before we arrive
- On commercial sites, let us know about site rules
- Let us know about parking restrictions
Getting a quote
Every job is quoted individually, so the first step is telling us about yours. Simply call 0345 464 0079 or send us an email and describe the job, and pictures are welcome.