Surrey · England
Window & door mastic in Crondall, Surrey
Professional window mastic in and around Crondall, with every bit of old sealant taken out first.
- Mastic that’s falling out in pieces
- Cracked internal joints between frame and plaster
- Cold air getting in at the frame edge
Different surfaces, different methods
Timber windows & doors
Where timber has rotted at the joint, it needs repairing first. We will point out any rot we find, as that’s a job for a joiner.
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.
Window mastic for homes and businesses in Crondall
Colour matters on a frame. We can seal in white, brown, anthracite grey, black or clear, so the line suits the frame instead of standing out. We work on patio & French doors, timber windows & doors and uPVC windows, and people most often call us about draughty joints inside around the window and water coming in at the bottom corners of a door.
Mastic can only go onto a dry, clean joint, so window work in Crondall is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
Each job carries a 12-month guarantee, whatever its size.
- Where
- Crondall (GU10)
- Region
- Surrey
- Cover
- A year, on every job
- Quotes
- A clear price before work begins
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Questions from Crondall
Do you cover smaller places like Crondall?
Yes. Crondall is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
I let a flat near Farnham station. Can you help?
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’ll give you a fixed price before work begins.
Are you ARBOMaster approved?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
Can new sealant go over the old?
No. New silicone will not bond to old silicone, and it traps any mould or water underneath. It all has to come out first.
Which products do you use?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice.
Can new window sealant be painted?
It depends on the sealant. Silicone is not paintable, but some hybrid sealants are. Tell us if you are decorating and we’ll choose accordingly.
Are you fully insured?
Yes, we’re fully insured for every job we do.
How long does it take to reseal the windows on a house?
A handful of frames is a short visit. We confirm the timing with your quote.
Aftercare tips
How long the joints last depends on use and care. We suggest:
- Paint up to the joint, not over it
- Wash the frames with mild soapy water
- Do not aim a pressure washer at the joints
- Avoid harsh chemicals near the mastic
On timber frames, keep the paintwork in good order, since wood that gets wet swells and shrinks more. Keep paint off the silicone itself.
Leaks normally show up in wet, windy weather, but resealing works best in dry conditions. Dealing with it when you first notice a crack avoids chasing leaks through the wet months.
Should I try it myself first?
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.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Also near Crondall
What else we do in Crondall
Window mastic in Crondall: local notes
Historic houses like Farnham Castle (about 2.7 miles east) are a reminder that the area around Crondall has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. 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.
Schools such as Crondall Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages. If you live in an older home near Church of All Saints, the joint between an old wall and a newer frame is usually the first place rain gets in.
Crondall is about 3 miles south of Fleet, in Surrey. Jobs in Crondall get the same care as everywhere else we work: old sealant removed completely, careful preparation and a 12-month guarantee. Our Surrey coverage runs to 395 places, and Crondall is one of them. Reading is on our list too, about 16 miles from Crondall.
Here we cover the GU10 postcode area for window mastic. Streets in the area include Church Street, The Borough and Glebe Road, and we cover them all. Other places close to Crondall include Redlands (1 mile north-east), Bowling Alley (1 mile north), Dora's Green (1 mile east), Warren Corner (1 mile east) and Mill Lane (1 mile north). Larger places within reach include Guildford (12 miles east), Woking (14 miles north-east), Camberley (9 miles north-east), Farnham (3 miles south-east), Frimley (8 miles north-east) and Haslemere (12 miles south-east).
Near you in Crondall
Around Crondall, our work takes us to homes and buildings near The Plume Of Feathers Public House and St Nicholas' School and the streets around them. Crondall’s nearest station is Farnham station, roughly 3.3 miles south-east of the centre. Well-known places in the area include Museum of Farnham (2.8 miles south-east) and Hart Shopping Centre (3.4 miles north). For a walk, there’s Beacon Hill and Aunt's Pool.
Signs you need window mastic in Crondall
Mastic ages in the weather. UV light hardens the outside of the bead, until it loses its stretch and starts to crack.
The problems people normally mention when they call include:
- Cracked or shrunken mastic around the frame
- Rushed sealant from a window installation
- Old mastic that has gone black or come away
- Draughty joints inside around the window
Letting a property close to Farnham station? Then cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Comparing quotes
- Whether all the old sealant comes out first
- What happens if the job turns out different
- What product goes in the joint
- What preparation is included
Landlords, agents and businesses in Crondall
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a one-year guarantee.
Mouldy or split sealant often shows up at the end of a tenancy. We can quote for more than one property at once.
Quotes for window mastic in Crondall
For a quick quote, just ask. The main things that affect it are:
- The number and length of the joints
- Access and height
- The number of rooms or windows
- Any mould that needs treating
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
Helping us quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- What the problem is, such as mould, gaps, leaks or cracking
- Any access issues, like height or stairs
- The rough size of the job
- The type of property
There’s no standard price list, as no two jobs are quite the same. Instead, your job gets its own clear quote. To arrange one, phone 0345 464 0079 or email us.
The process
Once we’re on site, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. After that, the work takes a morning for a couple of windows and a door. Somewhere like Crondall needs a little journey planning: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- We start by checking each window and door with you.
- We remove the old mastic and clean the frame and the wall.
- We fit backing rod in deep gaps so the sealant is the right depth.
- New exterior sealant goes on in a matching colour and is tooled smooth.
- Every joint is checked before we leave.
Preparing for the visit
- For business premises, tell us about site rules or sign-in
- Let us know about parking restrictions
- Keep pets and children clear of the area while we work
Ask for a quote
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is.