Surrey · England
Hersham Window Mastic
Window mastic across Hersham and nearby, with every bit of old sealant taken out first and a 12-month guarantee.
- Rain getting in at the frame or under the sill
- Gaps where the sill meets the wall
- Black, perished sealant on frames
Window mastic in Hersham, done properly
Mr Mastic’s applicators have more than 20 years’ experience with window and door sealants. We’re ARBOMaster approved and fully insured, and we give a one-year guarantee on the work. If you’re dealing with cracked sealant at the sill ends and mastic that has split away from the wall, we can put it right, whatever the surface.
In smaller places like Hersham, homes range from older cottages to newer houses, with windows to match: timber, uPVC and aluminium. The right sealant depends on the frame and on what it sits in.
Whatever the size of the job, it’s backed by our 12-month guarantee in Hersham and across Surrey.
- Place
- Hersham (KT12)
- Wider area
- Surrey
- Cover
- A year, on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
How we quote for window mastic
There’s no set price list, because no two jobs are the same. What we look at:
- The type of sealant required
- Whether old sealant or filler has to be cut out
- The size of the job
- When we can work, for business premises
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
What we need to know
Before you ask for a quote, have a think about:
- The type of property
- If someone has resealed it before
- The problem you’ve noticed
- How we’d reach the joints
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll talk you through what we’d do. When it suits you, ring 0345 464 0079 or send us an email.
Work for landlords, hotels and businesses
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.
For anyone letting property in or around Hersham, several properties can go on one quote. Send us the addresses and the work at each, and pictures by email help.
Your questions about window mastic in Hersham
Can you do window mastic in Hersham?
Yes. Our work covers London and the South East, and Hersham is part of that. Just call 0345 464 0079 or drop us an email with a few details of the job, and we will give you a clear quote.
Do you work for landlords with property near Walton-On-Thames station?
Yes, rental work is part of what we do. You can phone 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before work begins.
Can you seal over the old sealant?
No. Fresh sealant does not stick to old sealant, and it traps any mould or water underneath. We remove it all first.
Can you match the sealant to my frames?
Generally, yes. Tell us the frame colour when you get in touch and we’ll match it as closely as we can.
Do you have insurance?
Yes. We are fully insured for every job we do.
Can you do upstairs windows?
Yes, where they can be reached safely. Let us know about access when you ask for a quote and we’ll plan for it.
Do I need to be at home?
Access is agreed with you when the job is booked. Indoors, that usually means someone at home.
Can you do several jobs on one visit?
Yes. Just list everything you need and we’ll quote it together.
Aftercare tips
Simple care keeps the joints in good condition. Our advice:
- Look round the frames every year or so
- Keep timber frames painted
- Clear any debris from frame drain holes
- Wipe condensation off the frames
Check the drainage slots in the frames aren’t blocked, so water can run away instead of sitting against the joint.
Draughts get worse, not better. As the old mastic shrinks further, more air gets through, and heat escapes around the frame. A new joint closes it up.
How the job changes by surface
Window sills
The end joints of a sill tend to fail before the rest. A tight seal at each end keeps rain out of the wall.
Timber windows & doors
On period timber windows, traditional sand mastic is sometimes the better choice. We will tell you which suits your home.
How it works
Most of a good job is in the preparation, and we don’t rush it. Joints are cleaned back and dried before anything new goes in. In total, it normally takes anything from an hour or two to a full day, depending on how many frames there are. A visit to Hersham is planned like any other: the time, the access and where to park are agreed in advance. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- First we look at every frame and agree the list.
- The old mastic is cut out and the surfaces cleaned back.
- Where gaps are deep, backing rod goes in first.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- Every joint is checked before we leave.
Getting ready for the visit
- Clear the area around the work
- Try not to wet indoor joints just before the visit
- Let us know about earlier repairs to the joints
How to get a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is.
Advice
Towns and villages near Hersham
More services for Hersham
Frames and glazing around Hersham
Historic houses like The Homewood (about 1.4 miles south-east) are a reminder that the area around Hersham has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
If you look after a building such as Bell Farm Primary School, the mastic around its windows and doors needs looking after like any other building’s. If you let a flat or house near Walton-On-Thames station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Hersham is about 1 mile south of Walton-on-Thames, in Surrey. Hersham gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. 395 places in Surrey are on our list, large and small. Our London page covers work nearby, about 16 miles away.
Jobs for window mastic in KT12 is quoted and booked the same way as anywhere else. That includes homes and businesses on Police Station Road, Queensway South and Queensway. With the A244 close by, Hersham is simple for us to get to. We also cover the places around Hersham: Burwood Park (1 mile south-west), Walton-on-Thames (1 mile north), Whiteley Village (2 miles south-west), St George's Hill (2 miles west) and Weybridge (2 miles west). Further out, we also cover Guildford (11 miles south-west), Woking (8 miles south-west), Camberley (14 miles west), Epsom (6 miles east), Redhill (14 miles south-east) and Ewell (6 miles east).
What’s near Hersham
We work in homes and buildings around The Barley Mow Public House, West End Common and Three Rivers Academy and the streets around them. Hersham’s nearest station is Walton-On-Thames station, about 0.6 miles north-west of the centre. Nearby you’ll also find No. 2 New Zealand General Hospital (1.6 miles north-west) and Chessington Castle Hill (4.8 miles east). The countryside around Hersham includes Claremont Lake and Jubilee Wood.
What happens if it’s left?
A quick bead over the top of old mastic looks like an easy fix, but it won’t grip old, dirty sealant. It soon lifts and the leak carries on behind it. The old mastic has to come out. In an older home around Hersham, damp from a failed joint can get into timber and plaster, which is far harder to put right than the sealant itself.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
Why Hersham clients choose us
- Approved under the ARBOMaster scheme
- You choose the colour before work begins
- We’re fully insured
- A 12-month guarantee on all work
See what affects the cost or our reviews.
What we are called out for in Hersham
Older frames were often sealed with products that set hard. Once it’s rigid, every bit of frame movement pulls at it, leaving a hairline gap down one side.
Look out for these signs:
- Damp patches on the reveal after heavy rain
- Draughty joints inside around the window
- A bead that does not match the frame
- Cracked sealant at the sill ends
In the older streets around Church of St Peter, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Before booking anyone
- How long the guarantee is
- Who turns up on the day
- Whether they’re fully insured
- What product goes in the joint