Greater London · England
Sand mastic for sash & case windows in Long Ditton, Greater London
Traditional burnt sand mastic around sash and case windows and doors in stone and brick in Long Ditton, with a 12-month guarantee on every job. Call for a quick quote.
- Draughts and rain around sash boxes
- Modern sealant on a period surround
- Mastic worn away on windows facing the weather
Keeping the joints in good condition
Simple care keeps the joints in good condition. Our advice:
- Ask us before painting near the mastic
- Plan mastic work ahead of painting
- Ask a joiner to look at soft timber first
- Look over the window mastic once a year
Leave the new mastic unpainted, as traditional guidance advises. If you’re redecorating, ask us first.
Renewing mastic before redecorating saves doing it twice. Painting over failed mastic hides the problem for a while.
How we handle sand mastic in Long Ditton
Silicone on a period window often looks wrong and isn’t always the right material. Sand mastic gives a finish that matches the age of the house, and we can replace one with the other. We work on period & listed homes, sash and case windows and timber door frames, and the jobs we see most are window mastic to renew ahead of painting and patchy fillers round a sash window.
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.
- Place
- Long Ditton (KT6)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quotes
- A clear price before we start
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Why deal with it now?
An open joint round the frame lets weather in. Water can get to the frame and the masonry so renewing it early protects the window. Converted houses in London often have a bathroom above someone else’s living room, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Dealing with it early is far simpler.
Combining jobs into one visit is usually more efficient than separate visits, so tell us about everything that needs sealing. You’ll get one clear quote for the whole job.
Why choose Mr Mastic in Long Ditton
- Neat joints and a tidy finish
- Every job guaranteed for a year
- Approved under the ARBOMaster scheme
- 180+ five-star Google reviews
Read how sealant jobs are priced or our reviews.
The process
Once we’re on site, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. Most jobs then take anything from a few hours to a full day, depending on how many windows. 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.
- The joint is raked out and cleaned.
- We fill deep gaps so the new mastic is not too thick.
- New sand mastic is applied and shaped by hand.
- We finish the mastic to a tidy line.
Preparing for the visit
- Clear the area around the work
- Mention if the joints have been sealed before
- For indoor joints, keep the area dry beforehand if you can
Getting a quote
Quotes start with a quick conversation. 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 send us an email.
Related advice
What sealant work cannot fix
A few problems are outside what sealant work can do:
- Putty and glazing repairs
- Whether work needs listed building consent
- Rotten sashes, sills or window boxes (a joiner’s job)
If you are not sure, just phone 0345 464 0079 or send us an email and we’ll give you a straight answer.
Joints and surfaces we work on
- Sash and case windows
- Period & listed homes
- Stone surrounds
- Timber door frames
- Tenement windows
- Brick reveals
For landlords and businesses
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we will give you a quote.
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Resealing at the right time is simple maintenance that we can handle for you.
Your questions about sand mastic in Long Ditton
Can you help a landlord with a rental near Surbiton station?
Yes, landlords and agents are among the people we work for. You can call 0345 464 0079 or email us with the details for a clear quote.
Is parking a problem for a job in Long Ditton?
Parking in Long Ditton, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly.
How long does sand mastic take to go off?
It skins over fairly quickly but takes longer to harden fully. We will explain what to expect before we leave.
Will the old sealant be removed?
Yes. Sealing over the old bead is the commonest cause of early failure, and it’s something we never do.
Where is Mr Mastic based?
We’re based in Crawley, West Sussex, and we work across South East England, London and Scotland.
What information do you need?
The location, the problem and the rough size of the job. If you can, email a few pictures.
Is sand mastic better than silicone for my windows?
We’ll talk it through with you. Period homes often look best with sand mastic and newer frames suit modern sealant.
How long does sand mastic take?
A typical job takes a few hours for a single window, longer for several. We’ll confirm how long when we quote.
Also near Long Ditton
More services for Long Ditton
What affects the quote in Long Ditton
Jobs vary more than people expect. What affects the quote:
- How many areas need sealing
- How much old sealant there is and how hard it is to remove
- Which sealant suits the joint
- Mould in or behind the old joints
Every job is a little different, so we quote each one individually. Size, access and the product the joint needs all make a difference, and we’ll explain the quote if you ask.
Asking for a quote
To make quoting easier, let us know:
- How we’d reach the joints
- Whether it’s a home or a business
- The rough size of the job
- The address or postcode of the job
To get a quote, phone 0345 464 0079 or drop us an email with the location and a short description of the problem. We will give you a clear price before any work starts.
Sand mastic in Long Ditton: local notes
With historic houses such as Hampton Court Palace (about 1.5 miles north-west) nearby, there’s older building stock in the area around Long Ditton 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, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you look after a building such as Long Ditton Infant and Nursery School, its window and door frames need their mastic kept sound, just like a home’s. In the older streets around Church of St Mary, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Long Ditton is about 1 mile south-west of Surbiton, in Greater London. We provide sand mastic to homeowners, landlords and businesses in Long Ditton and the surrounding area. Our area takes in 764 places across Greater London, large and small. There’s also a page for London, about 12 miles away.
Here we cover the KT6 postcode area for sand mastic. If you need sand mastic at a property on Pound Close, Fleece Road and St Chads Close or a nearby road, our applicators can take on the job. We also cover the places around Long Ditton: Ditton Hill (1 mile south), Seething Wells (1 mile north), Thames Ditton (1 mile west), Hinchley Wood (1 mile south-west) and Surbiton Park (1 mile north-east). We also work in nearby towns such as London (12 miles north-east), City of Westminster (11 miles north-east), Marylebone (12 miles north-east), Kensington (9 miles north-east), St Pancras (13 miles north-east) and Shoreditch (14 miles north-east).
Local landmarks in Long Ditton
We work in homes and buildings around Shrewsbury House School, Stokes Field and Raintree pub, among other places. For rail, the closest station is Surbiton station, roughly 0.7 miles north-east. Other landmarks nearby include Tolworth Hospital (1.3 miles east) and Metropolitan Police Mounted Branch Museum (1.5 miles west). Not far away are The Lake and Kingston Hill Road area.
When to call us in Long Ditton
Timber swells and shrinks with the weather. That movement opens up the mastic joint over time.
The most common problems we see are:
- Draughts and rain around sash boxes
- Silicone on a period window that looks wrong
- Gaps where the frame meets the masonry
- Tired mastic found when preparing windows for paint
As a London address, Long Ditton can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Comparing quotes
- Who turns up on the day
- What product goes in the joint
- What the cure time is
- Which colour the sealant will be