West Sussex · England
Sand mastic for sash & case windows in Colworth, West Sussex
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in Colworth and across West Sussex. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Cement or filler used on old window joints that has cracked
- Silicone on a period window that looks wrong
- Mastic dropping out of the joint
How we handle sand mastic in Colworth
Our applicators renew the sand mastic around sash and case windows and doors in stone and brick. The old mastic is raked out, the joint is prepared and new mastic is shaped by hand. We are often asked to deal with mastic round period door frames that has failed and silicone on a period window that looks wrong, on tenement windows, sash and case windows and stone surrounds.
Somewhere as small as Colworth, older homes often have timber frames set in stone or brickwork. Not every older frame suits a modern silicone bead, and sometimes a traditional sand mastic is the better choice.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Location
- Colworth (PO20)
- Wider area
- West Sussex
- Cover
- A year, on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Landlord and commercial work in Colworth
If you manage several properties in or around Colworth, jobs at different addresses can go on one quote. Send us the addresses and the work at each, and photos by email help.
Landlords and letting agents in Colworth can book us as well as householders. Resealing between tenancies is a simple way to keep a property in good order.
What else we do in Colworth
Keeping the joints in good condition
How long the joints last depends on use and care. Here’s what we suggest:
- Check the mastic when you check the paintwork
- Ask the planning authority about consent for listed or conservation-area homes
- Avoid patching sand mastic with silicone
- Plan mastic work ahead of painting
Make sure water drains away from the window surround. Water sitting against the mastic shortens its life.
It’s best to renew mastic before painting the windows. Painting over failed mastic hides the problem for a while.
Honest limits
A few problems are outside what sealant work can do:
- Broken panes
- Decayed frames that need repair
- Sash cords, weights and draught-proofing of the sashes
Not sure which it is? You can call 0345 464 0079 or drop us an email and we will tell you honestly.
Where we work in Colworth
- Stone surrounds
- Timber door frames
- Sash and case windows
- Brick reveals
- Period & listed homes
- Tenement windows
Leave it or put it right?
If you’re redecorating, renew the mastic first. Painting over failed mastic doesn’t seal it and traditional guidance is to leave the new mastic unpainted. Where a wall is exposed, as many are in small places like Colworth, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Rather than a set price list, we price the job in front of us: the amount of work, the old material and the access. The price is agreed before we begin.
Why Colworth clients choose us
- Over 20 years’ experience
- Experience in homes, commercial sites and hotels
- Every job guaranteed for a year
- Old sealant always removed completely
Take a look at what affects the cost or customer reviews.
Common questions in Colworth
Do you work for landlords with property near Bognor Regis station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can ring 0345 464 0079 or email us with the details for a clear quote.
Will you come out to Colworth?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Will the old sealant be removed?
Yes. We cut out all the old sealant and clean the joint before applying anything new.
Do you do commercial work?
Yes, regularly. Larger jobs can be planned room by room or area by area.
How much does sand mastic cost in Colworth?
We do not publish prices, because the cost depends on the job: its size, the old material, access and the product needed. You’ll get a clear quote before any work starts.
Is it worth trying it myself?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Will it make a mess?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.
What guarantee comes with the work?
All our work has a one-year guarantee, and we’re fully insured.
Sand mastic in Colworth: local notes
Colworth is within about 3 miles of the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. Both are hard on the mastic around older windows and doors, which can dry out and crack sooner where a building faces the weather. Historic houses like Goodwood House (about 4 miles north-west) are a reminder that the area around Colworth 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.
For landlords with property near Bognor Regis station, any sash windows need sound mastic to keep draughts and rain out. Managing a site like Bartons Primary School? Then its window and door frames need their mastic kept sound, just like a home’s. Historic houses such as Goodwood House, about 4 miles north-west, show how far back building around Colworth goes, and older homes nearby need a sealant that suits their walls.
Colworth is about 2 miles north of Bognor Regis, in West Sussex. We provide sand mastic to homes and businesses in Colworth and the surrounding area. Across West Sussex, we cover 371 places, Colworth among them. We also work in Portsmouth, about 16 miles from Colworth.
We cover every part of PO20 for sand mastic. Other places close to Colworth include Merston (1 mile west), Oving (2 miles north-west), Lagness (2 miles south-west), Runcton (2 miles west) and Shopwyke (2 miles north-west). We also work in nearby towns such as Worthing (13 miles east), Chichester (4 miles north-west), Selsey (7 miles south-west), Littlehampton (8 miles east), Emsworth (10 miles west) and Rustington (9 miles east).
Around Colworth
Around Colworth, our work takes us to homes and buildings near The Regis School and The Brooks Local Nature Reserve and the streets around them. The nearest railway station is Bognor Regis station, about 2.5 miles south-east. A little further out are Bognor Regis Museum (2.7 miles south-east) and Tote Copse Castle (1.3 miles north-east).
What affects the cost of sand mastic
The price is agreed before any work begins. It’s based on:
- Any mould that needs treating
- How many rooms, windows or areas are involved
- Working hours on commercial sites
- Access and height
No two jobs are quite the same, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all make a difference.
What we need to know
You don’t need to know the technical terms. It helps if you can tell us:
- Photos by email, if that is easy
- What’s wrong with the joints now
- Any previous sealing or DIY work
- Any access issues, like height or stairs
For sand mastic in Colworth, phone 0345 464 0079 or send us an email. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Can I do it myself?
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
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 fails, we can still redo it.
How it works
Our applicators work methodically: protection first, then preparation, sealing and a tidy-up. Typically it takes a few hours for a single window, longer for several, and the area is left clean. Somewhere like Colworth needs a little journey planning: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- We fill deep gaps so the new mastic isn’t too thick.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
Preparing for the visit
- For business premises, tell us about site rules or sign-in
- For indoor joints, keep the area dry beforehand if you can
- Plan for the work area to be out of bounds to pets and children
Getting a quote
It all starts with a short chat. Describe the problem, the location and the size of the job. Whenever you are ready, phone 0345 464 0079 or send us an email.