Hampshire · England
Window & door mastic in Crawley, Hampshire
Problem with your window and door frames in Crawley? We cut out the old, prepare the joints and apply the right sealant, with a one-year guarantee.
- Mastic that has split away from the wall
- Leaking joints at the ends of sills
- Gaps left after new windows were fitted
When something else is needed
Sealant isn’t the answer to every problem, and we’d rather say so up front. It will not solve:
- A door that needs adjusting, rehanging or new seals
- A failed sealed unit that has misted up
- Penetrating damp from a failed cavity tray or render
If in doubt, ring 0345 464 0079 or email us and we will say what we think.
What we seal
- Aluminium frames
- Patio & French doors
- Window sills
- uPVC windows
- Timber windows & doors
- Composite doors
How we handle window mastic in Crawley
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. If the draught is through the window seals instead, we will tell you. We work on aluminium frames, window sills and timber windows & doors, and common reasons people get in touch are hard, cracked sealant around windows and draughts coming in around windows and doors.
Somewhere as small as Crawley, older homes often have timber frames set in stone or brickwork. Older buildings like these do not always suit modern silicone, and sometimes a traditional sand mastic is the better choice.
We stand behind the work with a one-year guarantee.
- Location
- Crawley (SO21)
- Region
- Hampshire
- Cover
- A year, on every job
- Quote
- A clear price before we start
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Crawley: your questions answered
Can you do window mastic in Crawley?
Yes. Our work covers London and the South East, and Crawley is part of that. You can ring 0345 464 0079 or send us an email and tell us what needs doing, and we’ll give you a clear price.
I let a flat near Winchester station. Can you help?
Yes, we work for landlords and agents. 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 we start.
Do you work on first-floor windows?
Yes, where it’s safe. For high or awkward windows, we will tell you what access is needed.
How many windows can you do in a day?
That depends on the number of frames, how they’re reached and the state of the old mastic. You will know the timing when we quote.
Will it make a mess?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.
Can you do the inside joint as well?
Yes. The outside joint keeps the weather out, and the inside joint stops draughts and finishes the reveal. We can do either or both.
Is there any odour?
Sometimes, a little. Any smell clears as the sealant cures.
Should I try DIY first?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
Surface by surface
Patio & French doors
The joints around patio doors run a long way, top, sides and threshold. The threshold and the bottom corners take the most water, so they get particular care.
uPVC windows
Some uPVC windows were sealed at fitting with a quick bead that never bonded. It comes out, deep gaps get backing rod and the joint is resealed.
Windows and doors in Crawley
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.
For landlords with property near Winchester station, renewing tired window mastic between tenants heads off draught and damp complaints.
Crawley is about 5 miles north-west of Winchester, in Hampshire. Whether you are in the middle of Crawley or further out, window mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Across Hampshire, we cover 683 places, Crawley among them. Our Southampton page covers work nearby, about 13 miles away.
We work across the SO21 postcode area for window mastic and the streets around it. We also cover the places around Crawley: Worthy Down (3 miles east), South Wonston (3 miles east), Sutton Scotney (4 miles north-east), Barton Stacey (4 miles north) and Springvale (4 miles east). Within a short drive, we also cover Winchester (5 miles south-east), Eastleigh (10 miles south), Andover (8 miles north-west), Totton (14 miles south), Chandler's Ford (9 miles south) and Hedge End (14 miles south).
Around Crawley
We work in homes and buildings around Fox And Hounds Public House and the streets around them. The nearest railway station is Winchester station, about 4.5 miles south-east. A little further out are Winchester Castle (4.8 miles south-east) and Royal Hampshire County Hospital (4.5 miles south-east). Green spaces nearby include Winnall Moors.
Keeping the joints in good condition
How long the joints last depends on use and care. We suggest:
- Don’t paint over the silicone
- Wipe condensation off the frames
- Don’t aim a pressure washer at the joints
- Keep paint and stain on wooden frames in good order
Keep the new mastic undisturbed while it cures, following the cure time we give you. Don’t point a pressure washer at the joints.
Water trapped behind a failed joint can start rot in timber frames and sills. Rotten timber needs a joiner, not a sealant, so it pays to reseal before that happens.
What we are called out for in Crawley
On timber frames, paint and putty build up around the joint. Old mastic gets painted over and cracks under the paint, and the wood moves with damp as well as heat.
Keep an eye out for these signs:
- Hard, cracked sealant around windows
- Black, perished sealant on frames
- Cracked internal joints between frame and plaster
- Leaking joints at the ends of sills
In the older streets around Church of St Mary, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Questions to ask before you book
- When the joint can take water or movement
- How much experience the applicator has
- What happens if they find a problem under the old sealant
- What the quote includes, VAT included or not
What happens on the day
At the end, we look at the finished work together and tell you how long to leave it. The visit itself usually takes a few hours for a few frames, or a day or more for a whole house, depending on how much there is to do. In a small place like Crawley, access is generally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- 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.
Getting ready for the visit
- Mention if the joints have been sealed before
- Mention any parking rules near the property
- Keep pets and children clear of the area while we work
How to get a quote
We do not publish a price list. Instead, we give you a clear quote for your job. To arrange one, ring 0345 464 0079 or drop us an email.
Read more
Towns and villages near Crawley
What else we do in Crawley
What happens if it’s left?
Draughts and leaks don’t always mean new windows. Where the frames are sound, new mastic generally deals with draughts and leaks at the edges. Problems with the glass or gaskets are for a window company, and we will say so. In a small place like Crawley, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
The cost depends on the amount of work, how much old material has to come out and access to the work. We give a clear quote before we start.
What you get with us
- Trusted Arbo and Everbuild sealants
- Experience in homes, commercial sites and hotels
- Old sealant always removed completely
- We’re fully insured
Should I try it myself first?
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.
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.