West Sussex · England
Sand mastic for sash & case windows in Coldwaltham, West Sussex
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in Coldwaltham and across West Sussex. Fully insured, ARBOMaster approved and guaranteed for a year.
- Draughts and rain around sash boxes
- Old sand mastic that has cracked, crumbled or fallen out
- Modern sealant on a period surround
About our sand mastic in Coldwaltham
Old sand mastic cracks, crumbles and falls out over time, leaving gaps round the window. Renewing it closes the gap so the surround looks right again. We work on period & listed homes, tenement windows and brick reveals, and people most often call us about mastic round period door frames that has failed and weathered mastic on the most exposed windows.
Somewhere as small as Coldwaltham, 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.
Each job carries a 12-month guarantee, large or small.
- Location
- Coldwaltham (RH20)
- Wider area
- West Sussex
- Guarantee
- 12 months on all our work
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Landlord and commercial work in Coldwaltham
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.
If you manage several properties in or around Coldwaltham, several properties can be quoted together. Send us the addresses and the work at each, and photos by email help.
Nearby places to Coldwaltham
Also in Coldwaltham
Keeping the joints in good condition
To keep the joints looking good and working properly:
- Check the mastic when you check the paintwork
- Make sure water runs off the sill
- Keep modern sealant off the mastic
- Leave the new mastic unpainted
Make sure water drains away from the window surround. Constant wetting wears the mastic faster.
It’s best to renew mastic before painting the windows. Painting over failed mastic hides the problem for a while.
Signs you need sand mastic in Coldwaltham
Previous repairs in cement or silicone often trap water or crack away. They don’t move with the timber and we normally remove them.
Keep an eye out for these signs:
- Failed mastic on an exposed elevation
- Mastic dropping out of the joint
- A silicone bead on a sash window that spoils the look
- Draughts and rain around sash boxes
If you look after a building such as St James' CofE Primary School, larger buildings have plenty of frames, and the mastic around each one ages.
What your quote should include
- How the surfaces are prepared before sealing
- The length of the guarantee
- How the colour is chosen
- Whether the sealant suits the joint
How it works
We bring everything the job needs with us, so you do not need to buy or prepare anything. Once we have agreed what’s being done, we protect the area and start. It normally takes a few hours for a single window, longer for several. Somewhere as small as Coldwaltham, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We check the window surrounds and agree which joints need renewing.
- Old, loose mastic is raked out and the joint cleaned.
- Deep voids are packed so the mastic is the right thickness.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- The mastic is finished to sit tidily against the stone or brick.
How to prepare
- Mention any sign-in or site rules at work premises
- Let us know about stairs, lifts or work at height
- Clear the area around the work
Ask for a quote
For sand mastic in Coldwaltham, call 0345 464 0079 or email us. Tell us what the problem is and where, and we will agree the price before any work begins.
Advice
Coldwaltham questions
Can you do sand mastic in Coldwaltham?
Yes, Coldwaltham is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or email us and tell us what needs doing.
Do you cover smaller places like Coldwaltham?
Yes, we do. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Can you quote for more than one area?
Yes, and it often makes sense. Combining jobs makes good use of the visit, so mention them when you ask for a quote.
What is sand mastic?
A traditional pointing material made from sand and a linseed-oil-based binder, used between timber frames and stone or brick.
Do you have insurance?
Yes. We are fully insured for domestic and commercial work.
How long does sand mastic take to harden?
Not right away. The skin forms first, and the full set comes later, and we will tell you what to expect.
Does someone need to be in?
It depends on the job. Inside work needs someone to give us access, while outside work can sometimes be arranged differently.
Is the work guaranteed?
Our 12-month guarantee applies on every job.
What sand mastic looks like in Coldwaltham
With historic houses such as Old Place Manor (about 2 miles north-east) nearby, there’s older building stock in the area around Coldwaltham as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
In the older streets around The Parish Church of St Giles, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. Letting a property close to Pulborough station? Then older sash windows in a rental need their mastic kept sound to keep the weather out.
Coldwaltham is about 9 miles north of Littlehampton, in West Sussex. Jobs in Coldwaltham get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. 371 places in West Sussex are on our list. For nearby work, see our Crawley page, about 19 miles away.
Here we cover the RH20 postcode area for sand mastic. We cover properties on London Road, Old London Road and Silverdale and the roads around them. Other places close to Coldwaltham include Watersfield (1 mile south-west), Hardham (1 mile north-east), Lower Horncroft (1 mile north-west), Coates (2 miles north-west) and Fittleworth (2 miles north-west). Further out, we also cover Horsham (13 miles north-east), Worthing (10 miles south-east), Bognor Regis (12 miles south-west), Chichester (12 miles south-west), Littlehampton (9 miles south) and Shoreham-by-Sea (14 miles south-east).
Landmarks near Coldwaltham
Typical jobs here are in homes near The Labouring Man pub and Lodge Hill Residential Centre. Coldwaltham’s nearest station is Pulborough station, about 1.8 miles north-east of the centre. A little further out are Amberley Museum (2.8 miles south) and Amberley Castle (2 miles south). Not far away are Amberley Wildbrooks RSPB Reserve and Bignor Hill.
Quotes for sand mastic in Coldwaltham
We quote each job individually. This is what makes a difference:
- Access and height
- Which sealant suits the joint
- Any mould that needs treating
- The size of the job
We don’t show prices on the website, because each job is priced on what it involves. Call for a quick quote and we’ll talk you through it.
What to tell us for a quote
What to tell us when you ask for a quote:
- If it’s domestic, commercial or a hotel
- What the problem is, such as mould, gaps, leaks or cracking
- The rough size of the job
- Pictures of the joints, sent by email
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we will talk you through the work before giving you a price.
What the job involves on each surface
Sash and case windows
The box of a sash and case window sits in the stone or brick opening. Sand mastic seals the joint round it.
Timber door frames
Doors face weather and wear, so their mastic can fail sooner. It’s renewed by hand.
When it isn’t the sealant
We will not take on work that will not last, so these are the limits:
- Crumbling stone or brickwork round the window
- Sash cords, weights and draught-proofing of the sashes
- Cracked or broken glass
If you’re not sure, just ring 0345 464 0079 or email us and we’ll give you a straight answer before booking.
What we seal
- Stone surrounds
- Timber door frames
- Tenement windows
- Sash and case windows
- Brick reveals
- Period & listed homes