Greater London · England
Sand mastic for sash & case windows in Wallington, Greater London
Sand mastic for Wallington, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Wind and rain getting in round a sash window
- Mastic dropping out of the joint
- Failed mastic on an exposed elevation
How we handle sand mastic in Wallington
Our applicators renew the sand mastic around sash and case windows and doors set in stone or brick. Out comes the old, loose mastic, the joint is prepared and new mastic is shaped by hand. We are often asked to deal with wind and rain getting in round a sash window and crumbling sand mastic round a window, on sash and case windows, period & listed homes and tenement windows.
London has a lot of flats and conversions, where windows are often on upper floors. In a converted house or block, the lease generally says who is responsible for the windows, so it’s worth checking before booking.
We stand behind the work with a one-year guarantee, so you’re not left on your own once the job is done.
- Location
- Wallington (SM6, SM5)
- Region
- Greater London
- Cover
- A year, on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Can I do it myself?
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it doesn’t work out, we can still put it right.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
What we cannot put right
A few problems are outside what sealant work can do:
- Broken panes
- Planning or listed building consent (your local planning authority decides)
- Sashes that rattle, stick or will not open
Not sure which it is? You can call 0345 464 0079 or email us and we’ll tell you honestly.
Joints and surfaces we work on
- Brick reveals
- Stone surrounds
- Tenement windows
- Period & listed homes
- Sash and case windows
- Timber door frames
The process
We keep the work tidy and contained to the area we are working on. The job usually takes a few hours for a single window, longer for several, and we explain the cure time before we leave. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Wallington. It helps if you can point us to a visitor permit or a bay close to the door.
- First we agree which joints need doing.
- 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.
- We dress the finish so it sits neatly against the masonry.
How to prepare
- Plan for the work area to be out of bounds to pets and children
- Let us know about parking restrictions
- Clear items away from the joints we are working on
Getting a quote
To get a quote, phone 0345 464 0079 or send us an email with the location and a short description of the problem. You will have a clear quote before any work starts.
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Why deal with it now?
Gaps round a sash window let in rain and draughts. Water can get to the frame and the masonry so renewing it early protects the window. Damp from a failed joint spreads quietly in older London brickwork and timber, and by the time it shows on a wall or ceiling in Wallington, the repair is bigger than the sealant job would have been.
The cost depends on the size of the job, how much old material has to come out and how easy the joints are to reach. We give a clear quote before work begins.
Why book with us
- Domestic, commercial and hotel work
- Rated 4.9 stars on Google
- Sanitary silicone with an anti-fungal additive in wet areas
- Over 20 years’ experience
See what affects the cost and customer reviews.
How to look after the new joints
Once the sealant has cured, a few habits help it last:
- Keep modern sealant off the mastic
- Leave the new mastic unpainted
- Ask the planning authority about consent for listed or conservation-area homes
- Renew mastic before redecorating the windows
Check the mastic when you check the paintwork. Small cracks are easier to deal with early.
An open joint round the box lets weather through. The longer it’s left, the more the joint opens as more mastic falls out.
How we quote for sand mastic
We quote each job individually. These are the things that affect it:
- The number and length of the joints
- The product the joint needs
- Whether there’s mould to deal with
- How easy the joints are to reach
What you pay reflects the work, not guesswork. That’s why we ask about the job first and give you a clear quote before any work starts.
Helping us quote
When you contact us, these details help:
- Any previous sealing or DIY work
- The rough size of the job
- The problem you’ve noticed
- If it’s domestic, commercial or a hotel
It all starts with a short chat. Describe the problem, the location and the size of the job, and we will talk you through what we’d do. When it suits you, ring 0345 464 0079 or email us.
FAQs for Wallington
Do you cover Wallington for sand mastic?
Yes, Wallington is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or drop us an email with a few details of the job.
Is parking a problem for a job in Wallington?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot.
Is it worth trying it myself?
You can, for simple jobs. Preparation is everything: all the old sealant out, and a clean, dry joint. If it does not work out, we can redo it.
Do you do commercial work?
Yes. We work in offices, washrooms, hotels and other commercial premises, as well as homes. We can talk about working times when we quote.
Do you work for letting agents?
Yes. We work for householders, landlords, letting agents, businesses and hotels.
Are you insured?
Yes. Mr Mastic is fully insured, and we have been doing sealant work for more than 20 years.
Should I use sand mastic or silicone?
It depends on the window. On many period windows, sand mastic looks right and suits the building and newer frames usually get a flexible sealant.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. We cover Wallington and the rest of Greater London, along with the rest of our area.
Surface by surface
Tenement and terrace windows
Windows above ground floor need the right access. Let us know the floor and we’ll confirm access.
Sash and case windows
The box of a sash and case window sits in the stone or brick opening. The gap round it is pointed with sand mastic.
Wallington homes and the weather
In London conversions and blocks, the lease decides who is responsible for the frames, so it’s worth checking before booking. The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
As a London address, Wallington can be tricky for parking: let us know about parking bays, permits or a driveway. Rented homes near Wallington station change hands often, and older sash windows in a rental need their mastic kept sound to keep the weather out. Managing a site like Holy Trinity CofE Junior School? Then its window and door frames need their mastic kept sound, just like a home’s.
Wallington is about 2 miles west of Croydon, in Greater London. For sand mastic in and around Wallington, please phone 0345 464 0079 or send us an email for a quick quote. We are based in Crawley and cover Greater London. We cover 764 towns and villages across Greater London, large and small. For nearby work, see our London page (10 miles or so).
Jobs for sand mastic in SM6 and SM5 works the same way as everywhere else we cover. Whether your property is on Wallington Square, London Road and Maldon Road or anywhere close by, we can help. With the A237 and B271 close by, Wallington is simple for us to get to. Other places close to Wallington include Bandonhill (1 mile east), Carshalton (1 mile west), Beddington (1 mile north-east), The Wrythe (1 mile north-west) and Roundshaw (1 mile south-east). Further out, we also cover London (10 miles north), City of Westminster (10 miles north), Marylebone (11 miles north), Kensington (10 miles north), St Pancras (11 miles north) and Shoreditch (12 miles north).
Landmarks near Wallington
In Wallington, that means homes and buildings near Carshalton Park, Dukes Head Public House and Wallington County Grammar School. There’s a railway station in Wallington itself: Wallington station. A little further out are Honeywood Museum (0.6 miles west) and Centrale Croydon (2.2 miles east). For a walk, there’s Sutton Ecology Centre Grounds and Duppas Hill.