Surrey · England
Box Hill Window Mastic
We cover Box Hill for mastic around window and door frames, sills and patio doors. Old material cut out, joints cleaned and sealed neatly.
- White mastic on grey or black frames
- Cold air getting in at the frame edge
- Gaps between the frame and the inside reveal
Window mastic in Box Hill
If you can feel air around a shut window, the gap is often at the frame. Resealing that joint can make a room feel noticeably less draughty and quietens the whistle on windy days. Where the air is getting in through the window itself, we’ll say so. Typical jobs include draughts coming in around windows and doors and leaking joints at the ends of sills, on composite doors, uPVC windows and window sills.
Mastic can only go onto a dry, clean joint, so window work in Box Hill is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
We guarantee the work for a year. If something isn’t right with it in that time, tell us and we’ll put it right.
- Location
- Box Hill (KT20)
- Wider area
- Surrey
- Guarantee
- 12 months on all our work
- Price
- A clear price before we start
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Looking after it afterwards
A little care helps the new joints last. Our advice:
- Keep timber frames painted
- Wash the frames with mild soapy water
- Look round the frames every year or so
- Make sure the drainage slots are not blocked
On timber frames, keep the paintwork in good order, since wood that gets wet swells and shrinks more. Paint up to the joint, not over the silicone.
Water gets in quietly when mastic fails. You might not see it until plaster blows or a damp patch appears inside. Catching it early keeps the fix to a reseal.
Leave it or put it right?
Running fresh sealant over the old joint is tempting, but it will not grip old, dirty sealant. It peels before long, and water still gets in behind. The old mastic has to come out. Around Box Hill, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
What you pay reflects the work, not a rough estimate. That is why we ask a few questions first and give you a clear quote before we start.
Why book with us
- Colour agreed with you before work begins
- Approved under the ARBOMaster scheme
- Old sealant always removed completely
- White, clear, grey or coloured to suit, where the product allows
Read what affects the cost and what customers say.
Landlord and commercial work in Box Hill
Landlords and agents in Box Hill can book us as well as householders. Resealing between tenancies is a simple way to keep a property in good order before the next move-in.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. We can quote for more than one property at once.
What affects the quote in Box Hill
We do not publish a price list, because no two jobs are the same. The quote depends on:
- Whether there’s mould to deal with
- Whether old sealant or filler has to be cut out
- How easy the joints are to reach
- The number of rooms or windows
Leaving a failed joint normally makes the job bigger, not smaller. If you are not sure whether it needs doing, call 0345 464 0079 or drop us an email for an honest opinion and a quote.
What to tell us for a quote
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- If it’s domestic, commercial or a hotel
- The rough size of the job
- Any access issues, like height or stairs
- A few pictures by email, if you can
Getting a quote is simple: let us know the job and the location. A few pictures by email make the job easier to understand, and we’ll come back to you with a quote.
What the job involves on each surface
Composite doors
A composite door usually sits in a plastic outer frame, so its perimeter joint is sealed much like a window. We match the colour to the frame.
Window sills
The end joints of a sill tend to fail before the rest. We reseal them so rain can’t run into the wall.
Box Hill homes and the weather
The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. With historic houses such as Polesden Lacey (about 3.9 miles west) nearby, there’s older building stock in the area around Box Hill as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
Schools such as The Ashcombe School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages. For an older house near a landmark such as St. Andrew's Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame. Rented homes near Betchworth station change hands often, and sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Box Hill is about 2 miles north-east of Dorking, in Surrey. Box Hill 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. Crawley is on our list too, about 11 miles from Box Hill.
Postcode districts we cover here for window mastic: KT20. Whether your property is on Boxhill Road, Usherwood Close and Fort Road or anywhere close by, our applicators can take on the job. If you’re just outside Box Hill, we cover Betchworth (1 mile south-east), Brockham (1 mile south), Buckland (1 mile south-east), Strood Green (2 miles south) and Headley (2 miles north). Further out, we also cover Guildford (12 miles west), Woking (13 miles west), Epsom (6 miles north), Horley (7 miles south-east), Redhill (5 miles east) and Ewell (7 miles north).
What’s near Box Hill
Around Box Hill, our work takes us to homes and buildings near Brockham Limeworks, among other places. For rail, the closest station is Betchworth station, about 0.8 miles east. Other landmarks nearby include Headley Court (2.8 miles north) and Reigate Priory Museum (3.6 miles east). Not far away are Colley Hill and Reigate Heath.
What we can’t put right
Honest advice matters more to us than a booking, so here’s what new sealant will not do:
- Damp coming through the wall itself rather than the frame joint
- A frame that has rotted at the joint
- A sash or casement that will not close properly
Not sure which it is? You can call 0345 464 0079 or send us an email and we will tell you honestly.
Where we work in Box Hill
- Aluminium frames
- Timber windows & doors
- Patio & French doors
- Window sills
- Composite doors
- uPVC windows
How it works
Before we leave, we go over the finished joints with you. The work normally takes a morning for a couple of windows and a door, depending on the size of the job. In a small place like Box Hill, access is generally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- First we look at every frame and agree the list.
- We remove the old mastic and clean the frame and the wall.
- Deep gaps are filled with backing rod to set the depth.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- We clear up and check every joint is fully closed.
Before we arrive
- Plan for the work area to be out of bounds to pets and children
- Mention any tricky access
- Tell us if parking is tricky
How to get a quote
We quote each job on its own. Simply call 0345 464 0079 or drop us an email and describe the job.
Related advice
Towns and villages near Box Hill
Other services in Box Hill
FAQs for Box Hill
Do you cover smaller places like Box Hill?
Yes, Box Hill is covered. Our work covers London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Can you do window mastic in Box Hill?
Yes. Our work covers London and the South East, and Box Hill is part of that. Just ring 0345 464 0079 or email us with a few details of the job.
Can you seal the gap between the frame and the plaster indoors?
Yes. The outside joint keeps the weather out, and the inside joint stops draughts and finishes the reveal. We do one or both.
Will you leave a mess?
Tidy work is part of the job. We protect what’s around the joints, and the area is left clean when we finish.
Will resealing my frames help with draughts?
In many cases. Air often gets in between the frame and the wall, and sealing the inside and outside joints closes that path.
What information do you need?
Just the basics: where it is, what you’ve noticed and how we reach it. Then ring 0345 464 0079 or send us an email.
Do you guarantee window mastic?
Yes, for 12 months. A yearly look at the joints helps them last.
Is there any odour?
It depends on the product. Some products have a noticeable smell, others very little.