Greater London · England
Sand mastic for sash & case windows in Westbourne Green, Greater London
Window and door surrounds in Westbourne Green need attention? We cut out the old, prepare the joints and apply the right sealant, with a 12-month guarantee.
- Mastic round period door frames that has failed
- Window mastic to renew ahead of painting
- Modern sealant on a period surround
Keeping the joints in good condition
How long the joints last depends on use and care. We suggest:
- Renew mastic before redecorating the windows
- Go gently near the mastic when preparing windows
- Ask a joiner to look at soft timber first
- Keep sills and gutters clear so water drains away
Do not touch or press the mastic while it hardens. It skins over quickly, but takes longer to harden fully.
Gaps round a sash box let in draughts and rain. Left, the gap tends to get bigger.
Sand mastic for homes and businesses in Westbourne Green
Sand mastic doesn’t last for ever and gaps open up round the frame. Renewing it closes the gap so the surround looks right again. We’re often asked to deal with window mastic to renew ahead of painting and crumbling sand mastic round a window, on stone surrounds, period & listed homes and timber door frames.
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.
Whatever the size of the job, you get the same one-year guarantee in Westbourne Green and across Greater London.
- Where
- Westbourne Green (W2, W9, W11)
- Region
- Greater London
- Cover
- A year, on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
What we are called out for in Westbourne Green
Shallow joints are a common cause. Mastic that is too thin cracks and drops out, which is why we pack deep voids first and get the depth right.
Common reasons people contact us are:
- Tired mastic found when preparing windows for paint
- A silicone bead on a sash window that spoils the look
- Mastic worn away on windows facing the weather
- Gaps round a timber door in stone or brick
As a London address, Westbourne Green can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Questions to ask before booking
- Whether you can choose the colour
- What preparation is included
- Who turns up on the day
- How long the guarantee is
Nearby places to Westbourne Green
Also in Westbourne Green
The process
The work is kept neat and contained to the area we are working on, so you can get on with your day. Expect the work to take anything from a few hours to a full day, depending on how many windows, and we tell you how long to leave it before we go. In a London area like Westbourne Green, the main things to plan are parking and access: let us know about parking, the floor we’ll be working on and any lift or shared entrance.
- We start by checking each surround and agreeing the joints to renew.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic is not too thick.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- The finish is dressed so it sits neatly against the stone or brick.
Getting ready for the visit
- Let us know about earlier repairs to the joints
- Tell us about access, such as stairs, a lift or high-level joints
- Mention any parking rules near the property
Getting a quote
Call for a quick quote, or email us if that is easier. Describe what needs sealing and we’ll explain what’s involved and send you a clear quote.
Advice
Frames and glazing around Westbourne Green
With historic houses such as Kensington Palace (about 1 mile south) nearby, there’s older building stock in the area around Westbourne Green as well as newer homes. In older buildings, 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, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Managing a site like Edward Wilson Primary School? Then the mastic around its windows and doors needs looking after like any other building’s. In the older streets around St Mary Magdalene, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Westbourne Green is about 2 miles north-east of Kensington, in Greater London. Homes, rented property, offices and hotels in Westbourne Green is covered for sand mastic. The work is guaranteed for a year. Westbourne Green is one of 764 towns and villages in Greater London we cover.
Work in W2, W9 and W11 is quoted and booked the same way as anywhere else. If you need sand mastic at a property on Salem Road, Talbot Road and Harrow Road or anywhere close by, our applicators can take on the job. Westbourne Green sits on or near the A404 and A4206, so getting to you is simple. Other places close to Westbourne Green include Little Venice (1 mile east), Westbourne (1 mile south-west), Maida Vale (1 mile north), Paddington Green (1 mile east) and Paddington (1 mile east). We also work in nearby towns such as London (4 miles east), St Pancras (3 miles east), Shoreditch (5 miles east), Walthamstow (8 miles north-east), Hoxton (5 miles east) and Whitechapel (5 miles east).
Around Westbourne Green
Typical jobs here are in homes near Maida Vale School, Emslie Horniman's Pleasance and Abdus Salam Library and the streets around them. Also close by are The Bridge House (less than half a mile east) and Westminster Academy (less than half a mile west). The nearest railway station is London Paddington station, about 0.5 miles south-east. Well-known places in the area include Greek Orthodox Cathedral Treasury Museum (0.6 miles south) and Paddington General Hospital (less than half a mile north-west). Green spaces nearby include The Long Water and Greville Place nature reserve.
How the job changes by surface
Stone surrounds
Old stone surrounds are often uneven, so the joint varies in width. We shape it by hand to follow the stone.
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.
Leave it or put it right?
A silicone bead can be quicker, but on period stone or brick it often looks out of place. Sand mastic is the traditional material and finishes neatly against the masonry. 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 Westbourne Green, the repair is bigger than the sealant job would have been.
We do not show prices on the website, because the cost depends so much on the job itself. Call for a quick quote.
What you get with us
- Anti-fungal silicone where joints get wet
- 20+ years of sealant experience
- Trusted Arbo and Everbuild sealants
- Neat joints and a tidy finish
Take a look at our cost guide and what customers say.
Westbourne Green questions
Can parking be tricky for a visit in Westbourne Green?
Parking in Westbourne Green, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
Do you cover Westbourne Green for sand mastic?
Yes. We work across London and the South East, and Westbourne Green is part of that. Just phone 0345 464 0079 or send us an email with a few details of the job, and we’ll give you a clear price.
Do you do commercial work?
Yes. We’ve worked for hotels, offices and other businesses and we are fully insured.
Which is right for my windows, sand mastic or modern sealant?
We will talk it through with you. Period homes often look best with sand mastic, and modern sealants suit newer frames.
Is it worth trying it myself?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs.
Do I need to be at home?
Access is agreed with you when the job is booked. Indoors, that generally means someone at home.
How long does the job take?
Most jobs take a few hours per window, depending on the condition of the joints, including the preparation. Your quote will say how long we expect yours to take.
Where is Mr Mastic based?
We work from Crawley. We cover Westbourne Green and the rest of Greater London, along with the rest of our area.
Work for landlords, hotels and businesses
We also work for property managers and facilities teams. We can quote a run of properties together.
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance.
Honest limits
New sealant can’t fix everything, and we’d rather say so up front. Sealant won’t put right:
- Crumbling stone or brickwork round the window
- Cracked or broken glass
- Timber that has rotted
If you’re not sure, just phone 0345 464 0079 or drop us an email and we’ll give you a straight answer before booking.
Joints and surfaces we work on
- Timber door frames
- Tenement windows
- Period & listed homes
- Stone surrounds
- Brick reveals
- Sash and case windows