West Sussex · England
Window Mastic in Colwood
Window mastic for Colwood, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Leaking joints at the ends of sills
- A bead that does not match the frame
- Hard, cracked sealant around windows
Window mastic for homes and businesses in Colwood
A window frame and the wall around it expand and shrink at different rates. Plastic and aluminium frames move with the temperature, while masonry stays fairly still. So the sealant has to stretch and recover, which is why we use a low-modulus product. We’re often asked to deal with sealant in the wrong colour for the frame and whistling draughts around closed windows, across aluminium frames, patio & French doors and window sills.
In a village or hamlet like Colwood, older cottages and farmhouses often have timber windows set in stone or brick. Older buildings like these do not always suit modern silicone, and sometimes a traditional sand mastic is the better choice.
You are covered for a year from the day we finish. If anything is not right with it, ring 0345 464 0079 or send us an email.
- Where
- Colwood (RH17)
- Wider area
- West Sussex
- Cover
- One year on every job
- Quotes
- A clear price before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
When it is not the sealant
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
- Misting between the panes of a double-glazed unit (that needs a new unit)
- Faulty window hardware
If in doubt, phone 0345 464 0079 or send us an email and we will say what we think.
Joints and surfaces we work on
- Timber windows & doors
- Patio & French doors
- Aluminium frames
- Window sills
- uPVC windows
- Composite doors
Places near Colwood
Other services in Colwood
Common problems we fix in Colwood
A lot of older mastic was never designed to stay flexible. Once it’s rigid, every bit of frame movement pulls at it, leaving a hairline gap down one side.
Signs it’s time to call us include:
- Water coming in at the bottom corners of a door
- Whistling draughts around closed windows
- Cracked sealant at the sill ends
- Draughty joints inside around the window
In and around Colwood, as anywhere, good window mastic starts with a clean, dry, properly prepared joint.
What to look for in a quote
- Is VAT in the price?
- Whether they’re fully insured
- When the joint can take water or movement
- Whether they seal over old material or remove it
How the visit works
There isn’t much for you to do on the day. Show us the job and we’ll take it from there. The work itself takes a few hours for a handful of frames, longer for a whole house, including the tidy-up. For a village or hamlet like Colwood, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- We start by checking each window and door with you.
- The old mastic is cut out and the surfaces cleaned back.
- Deep gaps are filled with backing rod to set the depth.
- New exterior sealant goes on in a matching colour and is tooled smooth.
- Every joint is checked before we leave.
Getting ready for the visit
- Mention any sign-in or site rules at work premises
- Mention any parking rules near the property
- Tell us about any previous sealing or DIY attempts
How to get a quote
Getting a quote is simple: let us know what needs doing and where and its rough size. A few photos by email make the job easier to understand, and we’ll take it from there.
Advice
What window mastic looks like in Colwood
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like Tyes Place (about 3.4 miles north-east) are a reminder that the area around Colwood has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
Tyes Place, about 3.4 miles north-east, is one of the historic houses in the wider area around Colwood.
Colwood is about 5 miles north-west of Burgess Hill, in West Sussex. Across the RH17 area, our applicators can take on window mastic. We cover 371 towns and villages across West Sussex, from the larger towns to small villages. For nearby work, see our Crawley page.
We cover every part of RH17 for window mastic. Whether your property is on Earwig Lane and Cross Colwood Lane or a nearby road, our applicators can take on the job. Close by, we work in Crabtree (1 mile north-west), Lower Beeding (2 miles north-west), Slaugham (3 miles north), Plummers Plain (3 miles north) and Monk's Gate (3 miles north-west). Larger places within reach include Crawley (8 miles north), Horsham (6 miles north-west), Worthing (15 miles south-west), Haywards Heath (6 miles east), Burgess Hill (5 miles south-east) and East Grinstead (13 miles north-east).
Around Colwood
In Colwood, that means homes and buildings near Leonardslee, among other places. Well-known places in the area include The Dene Hospital (3.8 miles south-east) and Cuckfield Museum (3.7 miles east). Not far away are Blunts Wood and Paiges Meadow.
Why act early in Colwood
Working on frames from a ladder with a sealant gun is not easy, especially upstairs. We cut out properly, back deep gaps and tool every joint neatly, in a sealant suited to the wall. Older cottages and farmhouses around Colwood can have timber 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’s why we ask a few questions first and send you a clear quote before work begins.
Why Colwood clients choose us
- White, clear, grey or another colour, product permitting
- Quality sealants from Arbo and Everbuild
- We are fully insured
- Any old sealant cut out fully, not covered over
See our cost guide and what customers say.
DIY sealant or a professional job?
If you’ve already had a go yourself, that is fine. We cut it out and start again.
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. All the old material has to come out first.
Quotes for window mastic in Colwood
You’ll get a clear quote before any work starts. It’s based on:
- Whether the work is at height
- The product the joint needs
- When we can work, for business premises
- Whether there’s mould to deal with
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. We take all of that into account in your quote.
What to tell us for a quote
Photos by email are helpful but not essential. Try to tell us:
- Pictures of the joints, sent by email
- Any previous sealing or DIY work
- The address or postcode of the job
- What the problem is, such as mould, gaps, leaks or cracking
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, and email pictures if that’s easy.
Colwood questions
Can you do window mastic in Colwood?
Yes. Our work covers London and the South East, and Colwood is part of that. Just ring 0345 464 0079 or drop us an email with a few details of the job.
What guarantee comes with window mastic in Colwood?
Every job comes with our 12-month guarantee, wherever it is. We’re fully insured, and an ARBOMaster approved applicator.
Will it make a mess?
Very little: the area around the joints is protected first, and we tidy up before we go.
Can new sealant go over the old?
No. The old sealant always comes out first, so the new sealant bonds properly.
Will there be a smell?
That depends on the sealant. Some smell for a while, some hardly at all, and any smell fades as they cure.
What sealant do you use?
It depends on the joint: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. We use products from Arbo and Everbuild.
Should I try DIY first?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Can you do several jobs on one visit?
Of course. Combining jobs makes good use of the visit, so mention them when you ask for a quote.
For landlords and businesses
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we will quote.