Surrey · England
Downside Window Mastic
Problem with your window and door frames in Downside? We remove the old material, prepare the joints and seal them properly, with a 12-month guarantee.
- Rain getting in at the frame or under the sill
- Draughts coming in around windows and doors
- Gaps where the sill meets the wall
What window mastic looks like in Downside
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Byfleet Manor (about 2.7 miles north-west) are a reminder that the area around Downside 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’s traditional sand mastic.
Managing a site like St Matthew's CofE Aided Infant School? Then larger buildings have plenty of frames, and the mastic around each one ages. In the older streets around St Michael's Chapel, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Downside is about 4 miles west of Leatherhead, in Surrey. For window mastic in and around Downside, it’s easy to get a quote: please phone 0345 464 0079 or drop us an email. We cover Surrey from our Crawley base, Downside included. Downside is one of 395 towns and villages in Surrey we cover for window mastic. Crawley is on our list too, about 17 miles from Downside.
Here we cover the KT11 postcode area for window mastic. If you need window mastic at a property on Downside Common, Downsview Close and Deacon Close or anywhere close by, our applicators can take on the job. We also cover the places around Downside: Hatchford (1 mile west), Martyr's Green (1 mile south-west), Hatchford End (2 miles west), Whiteley Village (3 miles north) and Wisley (3 miles west). We also work in nearby towns such as Guildford (8 miles south-west), Woking (7 miles west), Camberley (14 miles west), Epsom (6 miles east), Horley (14 miles south-east) and Redhill (12 miles south-east).
Local landmarks in Downside
We work in homes and buildings around The Plough Public House and Parkside School and the streets around them. Downside’s nearest station is Cobham & Stoke Dabernon station, about 1 mile north-east. Nearby you’ll also find Epsom Cottage Hospital (5.1 miles north-east) and Send and Ripley History Society Museum (3.8 miles west). For a walk, there’s Jubilee Wood and Boldermere Lake.
About our window mastic in Downside
If you can feel air around a shut window, the gap is often at the frame. A new joint stops the air getting through. If the draught is through the window seals instead, we’ll tell you. If you have a bead that doesn’t match the frame and untidy mastic left by window fitters, we can help, on timber windows & doors, aluminium frames and composite doors alike.
Homes in small places like Downside often stand in the open, with little to shelter their windows from wind and rain. Exposed frames and sills lose their mastic sooner than sheltered ones.
The work is covered for a year after we finish. If anything is not right with it, call 0345 464 0079 or email us.
- Where
- Downside (KT11)
- Region
- Surrey
- Cover
- 12 months on all our work
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Should I try it myself first?
If you are set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
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 affects the quote in Downside
There’s no set price list, because no two jobs are the same. What we look at:
- How much old sealant there is and how hard it is to remove
- Any mould that needs treating
- The product the joint needs
- The size of the job
Instead of a standard rate, we price the job in front of us: the amount of work, the old material and the access. You will know the price before we begin.
Helping us quote
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- Pictures of the joints, sent by email
- Whether it has been sealed before
- If it’s domestic, commercial or a hotel
- Roughly how big the job is
Every job is quoted individually. Simply phone 0345 464 0079 or send us an email and describe the job and send photos if you have them.
Honest limits
We’d rather tell you now than do work that won’t last, so here’s what sealant can’t put right:
- Draughts through the window seals rather than the frame
- A sash or casement that won’t close properly
- Damp problems in the wall away from the window
If you are not sure, just ring 0345 464 0079 or drop us an email and we’ll give you a straight answer.
Where we work in Downside
- Composite doors
- Timber windows & doors
- Aluminium frames
- Patio & French doors
- uPVC windows
- Window sills
Downside: your questions answered
Do you work for landlords with property near Cobham & Stoke Dabernon station?
Yes. We work for landlords and agents as well as householders, and several properties can be quoted together. You can ring 0345 464 0079 or email us with the details for a clear quote.
Do you cover smaller places like Downside?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Can you get sealant to suit coloured frames?
Yes. White, brown, anthracite grey, black and clear sealants are all available.
Are you an approved applicator?
Yes. We hold ARBOMaster approved applicator status and we’re fully insured too.
Can you quote for more than one area?
Yes. Just list everything you need and you’ll get one quote.
Should I try DIY first?
Some simple jobs can be done by a careful DIYer. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Are you insured?
Yes. Full insurance covers our work.
Will it make a mess?
We keep the work tidy. We protect what’s around the joints, and the area is left clean when we finish.
Why deal with it now?
Resealing frames is a short job: the visit takes a few hours for a handful of frames, longer for a whole house. Wait for damp to appear and there may be plaster and decorating to sort out too. Around Downside, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
The cost reflects the work involved, not guesswork. That’s why we ask about the job first and give you a clear price before work begins.
Why us?
- Rated 4.9 stars on Google
- Homes, businesses and hotels
- Colour picked to suit the job
- White, clear, grey or another colour, product permitting
Take a look at our cost guide and customer reviews.
Different surfaces, different methods
Composite doors
Front doors take the weather head on. Those corners get the most care.
uPVC windows
The frame is cleaned with a product that won’t harm the plastic, then the new bead is laid against the frame and the wall and tooled smooth.
Nearby places to Downside
Other services in Downside
The process
On the day, we look over the joints with you first, so you know exactly what we are doing. We protect the surfaces around the joints before any work begins. The work usually takes a few hours for a few frames, or a day or more for a whole house. Somewhere like Downside needs a little journey planning: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- First, we confirm safe access to each frame.
- All the failed sealant is cut away, along with any loose debris.
- Frame and wall are cleaned and must be dry before sealing, and primed where the sealant calls for it.
- Backing rod fills deep voids and the sealant goes in on top.
- We tool the joint so water runs off, then clear up.
Preparing for the visit
- For business premises, tell us about site rules or sign-in
- Tell us about access, such as stairs, a lift or high-level joints
- Move anything stored near the joints
Ask for a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we will talk you through the work before giving you a price.
Related advice
When to call us in Downside
Some failures date back to when the windows were fitted. Sealant run over dust, wet brick or loose mortar never bonded as it should, and it lets go sooner than it should.
These are the problems we are asked about most:
- Rushed sealant from a window installation
- Cracked sealant at the sill ends
- Cracked or shrunken mastic around the frame
- Mastic that’s falling out in pieces
If you let a flat or house near Cobham & Stoke Dabernon station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Comparing quotes
- What insurance they hold
- Whether they seal over old material or remove it
- Whether VAT is included
- How much experience the applicator has