Wokingham · England
Window Mastic in Crowthorne
Our applicators work in Crowthorne on mastic around window and door frames, sills and patio doors. Old sealant removed completely, joints prepared properly.
- Draughty joints inside around the window
- Hard, cracked sealant around windows
- Leaking joints at the ends of sills
Window mastic in Crowthorne
From a single sill to a whole house of windows, you will get a clear quote before work begins. To get one, phone 0345 464 0079 or email us with the number of frames and any access details. We work on aluminium frames, composite doors and timber windows & doors, and people most often call us about gaps left after new windows were fitted and sealant in the wrong colour for the frame.
In a town like Crowthorne, the windows on the most exposed side of a house take the brunt of the rain, so the mastic there tends to fail first. Checking every frame, not just the obvious one, is time well spent.
There’s a 12-month guarantee on every job.
- Location
- Crowthorne (RG45, RG40)
- Wider area
- Wokingham
- Guarantee
- A year, on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
What we are called out for in Crowthorne
Some failures date back to when the windows were fitted. Mastic laid onto dusty, damp or crumbling surfaces didn’t grip properly, and it lets go sooner than it should.
Any of these means the joints need attention:
- Gaps between the frame and the inside reveal
- Mastic that is falling out in pieces
- Cracked sealant at the sill ends
- Rain getting in at the frame or under the sill
Letting a property close to Crowthorne station? Then sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Before booking anyone
- Whether they’re fully insured
- What happens if they find a problem under the old sealant
- What preparation is included
- What product goes in the joint
Places near Crowthorne
Other services in Crowthorne
Should I try it myself first?
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it doesn’t work out, we can still put it right.
Surface by surface
Patio & French doors
Heavy door frames can move more than windows. The sealant must cope with it.
Timber windows & doors
Timber moves with moisture as well as heat, so the joint must stay flexible. The paint or stain needs to be sound where the sealant meets it.
Frames and glazing around Crowthorne
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Homes close to Crowthorne Methodist Church include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. Schools such as Crowthorne Church of England Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
Crowthorne is about 3 miles south-west of Bracknell, in Wokingham. For window mastic in and around Crowthorne, please ring 0345 464 0079 or send us an email for a quick quote. We cover Wokingham from our Crawley base. Crowthorne is one of 35 towns and villages in Wokingham where we work for window mastic. There’s also a page for Reading, about 9 miles away.
Here we cover the RG45 and RG40 postcode area for window mastic. You will find streets such as Church Road East, Church Road West and High Street. Crowthorne sits on or near the A321 and B3348, so getting to you is simple. Other places close to Crowthorne include Owlsmoor (1 mile south-east), Home Farm (1 mile north-east), Wooden Hill (2 miles north-east), Sandhurst (2 miles south) and Hanworth (2 miles north-east). Larger places within reach include Reading (9 miles north-west), Wokingham (3 miles north-west), Woodley (7 miles north-west), Earley (7 miles north-west), Lower Earley (6 miles north-west) and Winnersh (5 miles north-west). Crowthorne is among the bigger towns we cover in Wokingham.
Around Crowthorne
Typical jobs here are in homes near King Edward VI Aston School, The Prince pub and Edgbarrow Woods and the streets around them. The closest station to Crowthorne is Crowthorne station, roughly 1 mile south-west. Well-known places in the area include The Lexicon (3.7 miles north-east) and Pinewood Hospital (0.9 miles north). Not far away are Wildmoor Heath and Heath Lake.
Crowthorne: your questions answered
Is Crowthorne in your area for window mastic?
Yes, Crowthorne is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or email us with a few details of the job, and we will send you a clear quote.
Is there a guarantee on window mastic in Crowthorne?
All our work, in Crowthorne and everywhere else, comes with a 12-month guarantee. We are also fully insured and ARBOMaster approved.
Do you seal inside as well as outside?
Yes, we do both. Indoors, we seal between the frame and the plaster or reveal, using a paintable sealant if you want to decorate.
Will there be a smell?
Sometimes, a little. Any smell clears as the sealant cures, and ventilation helps.
Can you match the sealant to my frames?
Yes. Grey and black frames get grey or black sealant, and wood-effect frames usually suit brown.
Do you remove the old sealant?
Yes. All of the old material is cut out and the joint cleaned.
How many windows can you do in a day?
A handful of frames is a short visit. You will get a timescale with the quote.
Do you work for hotels and businesses?
Yes. Hotels, offices and other businesses use us.
What sealant work cannot fix
We will always be straight with you, so here’s what new sealant will not do:
- Penetrating damp from a failed cavity tray or render
- Faulty window hardware
- Draughts through the window seals rather than the frame
Not sure which it is? You can call 0345 464 0079 or email us and we’ll tell you honestly.
Where we work in Crowthorne
- Aluminium frames
- uPVC windows
- Patio & French doors
- Window sills
- Timber windows & doors
- Composite doors
Landlords, agents and businesses in Crowthorne
From a single let to a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance that we can handle for you.
What happens if it’s left?
Getting a straight, even bead on an outside frame takes practice, especially on upper floors. A professional job is cut out properly, backed where needed and finished neatly, using a product chosen for the frame and wall. Black mould and gaps in sealant do not fix themselves, and in a busy household in Crowthorne they spread with every shower and every downpour. Replacing the sealant now is the simplest fix.
Instead of a standard rate, we look at what your job involves: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Why book with us
- 4.9 on Google from 180+ five-star reviews
- More than 20 years in sealant work
- White, clear, grey or coloured to suit, where the product allows
- We never seal over old sealant
See our cost guide and what customers say.
What happens on the day
We bring everything the job needs with us. After a quick look at the joints together, we protect the area and start. It normally takes most of a day for a typical house, less for a few frames. Parking in a town like Crowthorne is generally straightforward, but tell us if there’s a driveway or any restrictions, and let us know if the work is upstairs, in a flat or up high outside.
- Each frame is looked over and we agree which ones need resealing.
- The old mastic is cut out and scraped back to clean surfaces.
- Where the gap is deep, backing rod goes in first.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- Every joint is tooled smooth and checked before we leave.
Preparing for the visit
- Clear items away from the joints we’re working on
- Keep pets and children clear of the area while we work
- Let us know about parking restrictions
How to get a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and add photos by email if you can.