Surrey · England
Thorncombe Street Window Mastic
Our applicators work in Thorncombe Street on mastic around window and door frames, sills and patio doors. Old sealant removed completely, joints prepared properly and a one-year guarantee.
- Damp patches on the reveal after heavy rain
- Mastic that’s falling out in pieces
- A bead that doesn’t match the frame
Can I do it myself?
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
If you’re set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
About our window mastic in Thorncombe Street
Mr Mastic’s applicators have more than 20 years’ experience with window and door sealants. We’re fully insured ARBOMaster approved applicators, and we give a 12-month guarantee on the work. If you have cracked or shrunken mastic around the frame and cracked internal joints between frame and plaster, we can help, on composite doors, aluminium frames and timber windows & doors alike.
In a village or hamlet like Thorncombe Street, older cottages and farmhouses often have timber windows set in stone or brick. Older buildings like these don’t always suit modern silicone, so the sealant has to be chosen to suit the building.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Where
- Thorncombe Street (GU5)
- Wider area
- Surrey
- Cover
- 12 months on all our work
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Work for landlords, hotels and businesses
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Mouldy or split sealant often shows up at the end of a tenancy. Several properties can go on one quote.
Keeping the joints in good condition
A little care helps the new joints last. Our advice:
- Check the mastic once a year
- Do not aim a pressure washer at the joints
- Clear any debris from frame drain holes
- Avoid harsh chemicals near the mastic
Clean the frames with mild soapy water, and keep solvents and harsh chemicals off the joint.
Draughts get worse, not better. As old mastic keeps shrinking, the gap widens, and heat escapes around the frame. A new joint closes it up.
What we do, step by step
There isn’t much for you to do on the day. Show us the job and we will take it from there. The work itself takes anything from an hour or two to a full day, depending on how many frames there are, including the tidy-up. Somewhere as small as Thorncombe Street, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We start by checking each window and door with you.
- Next the failed sealant is cut away and the joint cleaned.
- We fit backing rod in deep gaps so the sealant is the right depth.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- Every joint is checked before we leave.
Preparing for the visit
- For business premises, tell us about site rules or sign-in
- Where the joints are inside, avoid wetting them before we arrive
- Let us know about parking restrictions
How to get a quote
Call for a quick quote, or email us if that is easier. Tell us about the joints that need doing and we’ll explain what’s involved before giving you a price.
Advice
How we quote for window mastic
Some jobs are bigger than they look, and some smaller. What affects the quote:
- How many areas need sealing
- When we can work, for business premises
- How much there is to do
- Any mould that needs treating
A few things move the cost up or down: how much old sealant there is and how stubborn it is, any mould to treat, and whether the work is at height. Your quote takes all of that into account.
Asking for a quote
What to tell us when you ask for a quote:
- Photos by email, if that’s easy
- Roughly how big the job is
- Access, such as stairs, a lift or height
- If someone has resealed it before
Asking for a quote is easy: tell us what needs doing and where, and roughly how big it is. A few pictures by email make the job easier to understand.
Towns and villages near Thorncombe Street
Other services in Thorncombe Street
Questions from Thorncombe Street
Do you cover smaller places like Thorncombe Street?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Can you help a landlord with a rental near Godalming station?
Yes. We work for landlords and letting agents as well as homeowners, and several properties can be quoted together. You can call 0345 464 0079 or drop us an email with the details for a clear quote.
Do you take out the old sealant first?
Yes. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
Is there any odour?
It depends on the product. Some products have a noticeable smell, others very little, and any smell fades as they cure.
Where is Mr Mastic based?
We’re based in Crawley, and we work across South East England, London and Scotland.
Can you work on commercial sites?
Yes. We work in offices, washrooms, hotels and other commercial premises. We can talk about working times when we quote.
What do you need from me for a quote?
A short description and the location, plus pictures if you have them. We’ll ask anything else we need to know.
Can you do upstairs windows?
Yes, where it’s safe. Higher or awkward frames may need extra access, and we’ll confirm what’s needed.
Honest limits
We will always be straight with you, so here’s what new sealant will not do:
- Misting between the panes of a double-glazed unit (that needs a new unit)
- Damp coming through the wall itself rather than the frame joint
- A sash or casement that won’t close properly
If you are not sure, just call 0345 464 0079 or send us an email and we’ll give you a straight answer before booking.
Joints and surfaces we work on
- Window sills
- Composite doors
- Timber windows & doors
- Aluminium frames
- Patio & French doors
- uPVC windows
When to call us in Thorncombe Street
A lot of older mastic was never designed to stay flexible. Once it’s rigid, every bit of frame movement pulls at it, and a gap opens along one edge.
The problems people normally mention when they call include:
- Cold air getting in at the frame edge
- Untidy mastic left by window fitters
- Cracked or shrunken mastic around the frame
- Sealant in the wrong colour for the frame
Schools such as Godalming College are buildings too, and its window and door frames need their mastic kept sound, just like a home’s.
Questions to ask before you book
- What preparation is included
- Which colour the sealant will be
- When the joint can take water or movement
- Whether all the old sealant comes out first
What window mastic looks like in Thorncombe Street
London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Loseley Park (about 3.4 miles north-west) are a reminder that the area around Thorncombe Street 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.
Loseley Park, about 3.4 miles north-west, is one of the historic houses in the wider area around Thorncombe Street, and older homes nearby need a sealant that suits their walls. Rented homes near Godalming station change hands often, and cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Thorncombe Street is about 5 miles south of Guildford, in Surrey. Every kind of property in Thorncombe Street can book us for window mastic, old or new, large or small. The work is guaranteed for a year. Our Surrey coverage runs to 395 places, and Thorncombe Street is one of them. There’s also a page for Crawley, roughly 17 miles from Thorncombe Street.
Our applicators cover all of GU5 for window mastic. Streets in the area include Thorncombe Street and Alldens Hill, and we cover them all. Nearby, we also carry out window mastic in Munstead Heath (1 mile west), Birtley Green (1 mile north-east), Grafham (1 mile east), Hascombe (1 mile south) and Bramley (2 miles north-east). Further out, we also cover Guildford (5 miles north), Woking (10 miles north), Camberley (13 miles north-west), Farnham (10 miles west), Dorking (11 miles east) and Frimley (12 miles north-west).
Around Thorncombe Street
For rail, the closest station is Godalming station, about 2.3 miles north-west. A little further out are Milford Hospital (2.4 miles west) and Godalming Museum (2.2 miles north-west). Not far away are Farncombe Wood and Hydon's Ball.