West Sussex · England
Window & door mastic in Coolham, West Sussex
Professional window mastic in and around Coolham, with every bit of old sealant taken out first.
- Sealant in the wrong colour for the frame
- Mastic that has split away from the wall
- Whistling draughts around closed windows
Window mastic in Coolham, done properly
Every window and door frame has a gap around it, and mastic is what closes it. When it cracks, hardens or pulls away, draughts and rain get in. The old mastic is removed and the joint resealed with a flexible exterior sealant. We work on uPVC windows, aluminium frames and window sills, and common reasons people get in touch are damp patches on the reveal after heavy rain and old mastic that has gone black or come away.
Around Coolham, many homes face open ground, so their windows and doors take the full weather. That exposure dries out and cracks the mastic around frames and sills faster.
You get a one-year guarantee, the same in Coolham as everywhere else we work.
- Location
- Coolham (RH13)
- Wider area
- West Sussex
- Guarantee
- 12 months on all our work
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Honest limits
It helps to know what we can’t do too:
- Faulty window hardware
- Condensation trapped between the panes
- Worn gaskets, brush seals or a door that has dropped
If you are not sure, just ring 0345 464 0079 or drop us an email and we’ll give you a straight answer.
What we seal
- Composite doors
- uPVC windows
- Window sills
- Timber windows & doors
- Aluminium frames
- Patio & French doors
Why it’s worth doing now in Coolham
Failed mastic isn’t a reason to replace sound windows. Where the frames are sound, new mastic generally deals with draughts and leaks at the edges. If we find failed glass units or worn seals, we will tell you. Around Coolham, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, plus any working-time requirements on site. Call for a quick quote and we’ll explain what it covers.
Why us?
- Colour picked to suit the job
- Trusted Arbo and Everbuild sealants
- You choose the colour before work begins
- A choice of colours where the product allows
Read our cost guide or customer reviews.
Can I do it myself?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Towns and villages near Coolham
Other services in Coolham
What we are called out for in Coolham
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.
People normally contact us when they notice one of these:
- Black, perished sealant on frames
- Gaps left after new windows were fitted
- Hard, cracked sealant around windows
- Cracked sealant at the sill ends
Letting a property close to Billingshurst station? Then cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Comparing quotes
- What the cure time is
- Whether they’re fully insured
- The length of the guarantee
- What happens if they find a problem under the old sealant
How it works
There isn’t much for you to do on the day. Point us to the joints and we’ll get on with it. The job generally takes a few hours for a few frames, or a day or more for a whole house from start to finish. In a small place like Coolham, access is usually the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- First, we confirm safe access to each frame.
- All the failed sealant is cut away.
- Frame and wall are cleaned and must be dry before sealing, and primed where the sealant calls for it.
- Backing rod fills deep voids and the sealant goes in on top.
- We tool the joint so water runs off, then clear up.
Preparing for the visit
- Clear the area around the work
- Keep pets and children clear of the area while we work
- Tell us about access, such as stairs, a lift or high-level joints
Ask for a quote
Call for a quick quote, or email us if that’s easier. Tell us about the joints that need doing and we will explain what’s involved before giving you a price.
Related advice
Different surfaces, different methods
Composite doors
Front doors take the weather head on. Those corners get the most care.
Aluminium frames
Metal frames expand in the sun and are often slim, with little room for error. A neat, narrow bead in a colour to match keeps the clean look.
How we quote for window mastic
Call for a quick quote. What matters most is:
- How much old sealant there is and how hard it is to remove
- Which sealant suits the joint
- How many rooms, windows or areas are involved
- When we can work, for business premises
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
What to tell us for a quote
To help us quote quickly, please include:
- What the problem is, such as mould, gaps, leaks or cracking
- Whether it’s a home or a business
- Roughly how big the job is
- Any access issues, like height or stairs
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, ring 0345 464 0079 or send us an email.
Common questions in Coolham
Do you cover smaller places like Coolham?
Yes, we do. Our work covers London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Can you help a landlord with a rental near Billingshurst station?
Yes. We work for landlords and agents as well as homeowners, and several properties can go on one quote. Just ring 0345 464 0079 or drop us an email with the address and what needs doing, and we will give you a clear price.
Do you hold any approvals?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
Can new sealant go over the old?
No. The old sealant always comes out first.
Do you work for hotels and businesses?
Yes. We have worked for hotels, offices and other businesses.
Can you do upstairs windows?
Normally, yes. Access is planned before we start.
Which products do you use?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Are you insured?
Yes. We are fully insured, and we can confirm the details when we quote.
Windows and doors in Coolham
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.
For an older house near a landmark such as St Mary's Mission Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. If you look after a building such as William Penn School, the mastic around its windows and doors needs looking after like any other building’s.
Coolham is about 6 miles south-west of Horsham, in West Sussex. Homes, rented property, offices and hotels in Coolham can book us for window mastic. Every job comes with our 12-month guarantee. Coolham is one of 371 towns and villages in West Sussex where we work for window mastic. Crawley is on our list too, around 12 miles away.
Our applicators cover all of the RH13 postcode area for window mastic. You will find streets such as Coolham Road and West Chiltington Lane. Other places close to Coolham include Goose Green (3 miles south), Gay Street (3 miles south-west), Adversane (3 miles west), North Heath (3 miles west) and West Chiltington (3 miles south-west). Further out, we also cover Crawley (12 miles north-east), Horsham (6 miles north-east), Worthing (12 miles south), Haywards Heath (13 miles east), Burgess Hill (12 miles east) and Littlehampton (14 miles south-west).
What’s near Coolham
Around Coolham, our work takes us to homes and buildings near The Selsey Arms Public House. The nearest railway station is Billingshurst station, roughly 2.4 miles north-west. A little further out are Christs Hospital School Museum (3.9 miles north-east). Not far away are Knepp Wildland.