East Sussex · England
Hamsey Sand Mastic
Window and door surrounds in Hamsey need attention? We cut out the old, prepare the joints and apply the right sealant, with a 12-month guarantee.
- Crumbling sand mastic round a window
- Cement or filler used on old window joints that has cracked
- Tired mastic found when preparing windows for paint
For landlords and businesses
Housing providers, facilities teams and property managers book us too in Hamsey and across East Sussex. We can quote a run of properties together, and we are fully insured.
For anyone letting property in or around Hamsey, several properties can go on one quote. Send us the addresses and the work at each, and photos by email help.
Sand mastic in Hamsey, done properly
Sand mastic suits most period window surrounds. On modern frames we’d normally use a flexible sealant and we will explain which is best for yours. If you have gaps where the frame meets the masonry and a silicone bead on a sash window that spoils the look, we can put it right, whatever the surface.
Mastic can only go onto a dry, clean joint, so window work in Hamsey is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
The work is covered for a year after we finish. If anything is not right with it, call 0345 464 0079 or drop us an email.
- Location
- Hamsey (BN8)
- Region
- East Sussex
- Guarantee
- A year, on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Other services in Hamsey
Hamsey: your questions answered
Can you help a landlord with a rental near Cooksbridge station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. Just call 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll give you a clear price.
Is Hamsey within the area you cover?
Yes, we do. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Do you work for hotels and businesses?
Yes. Commercial and hotel work is a large part of what we do. Working times can be discussed when we quote.
Can sand mastic be painted?
It’s traditionally left unpainted, as guidance on traditional windows advises. Talk to us before any painting near it.
What does sand mastic cost?
We don’t publish prices, because the cost depends on the job: how much there is, what’s there now, how we reach it and what it needs. We agree the price before any work begins.
Which is right for my windows, sand mastic or modern sealant?
For period timber windows in stone or brick, sand mastic is often the better fit. On modern frames, we’d normally use a flexible sealant.
What exactly is sand mastic?
It’s a mix of sand and a linseed-oil-based binder. It’s built up in the joint by hand and finished to sit neatly against the masonry.
Can I do it myself?
You can, for simple jobs. The key is preparation: remove all the old material and work on a clean, dry joint. If it doesn’t work out, we can redo it.
What affects the quote in Hamsey
There’s no set price list. The quote depends on:
- The number of rooms or windows
- Mould in or behind the old joints
- Any working-time requirements on site
- How easy the joints are to reach
Doing several joints on one visit generally makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. We will send you a clear quote for the lot.
What to tell us for a quote
There’s no need for technical detail. Just tell us:
- How we’d reach the joints
- Where the job is, and your postcode
- If someone has resealed it before
- The rough size of the job
To get a quote, phone 0345 464 0079 or drop us an email with the location and a short description of the problem. You’ll have a clear quote before any work starts.
Different surfaces, different methods
Tenement and terrace windows
Rows of sash windows on tenements and terraces often need renewing together. We work on single windows or whole elevations.
Timber door frames
A neat sand mastic joint round a front door suits a period home.
Leave it or put it right?
Filling over old, loose mastic doesn’t last. Raking out and preparing the joint gives it a sound base so the new mastic stays put. Where a wall is exposed, as many are in small places like Hamsey, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Rather than a set price list, we price the job in front of us: the amount of work, the old material and the access. You will know the price before we begin.
Why choose Mr Mastic in Hamsey
- We’re fully insured
- Tidy, careful work
- Sanitary silicone with an anti-fungal additive in wet areas
- Arbo and Everbuild products
Read our cost guide and customer reviews.
What happens on the day
On the day, there’s very little for you to do. Show us the job and we’ll take it from there. The job generally takes a few hours for a single window, longer for several from start to finish. Somewhere like Hamsey needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- Each surround is checked first.
- The joint is raked out and cleaned.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
Preparing for the visit
- Mention any tricky access
- Move anything stored near the joints
- Keep pets and children clear of the area while we work
Get a quote
It all starts with a short chat. Describe the problem, the location and the size of the job, and we’ll explain how we’d tackle it. When it suits you, phone 0345 464 0079 or email us.
Read more
How to look after the new joints
Joint life depends on how it’s used and looked after. We suggest:
- Check the mastic when you check the paintwork
- Clear gutters so water does not pour onto the windows
- Get any rot dealt with first
- Avoid patching sand mastic with silicone
Make sure water drains away from the window surround. Constant wetting wears the mastic faster.
An open joint round the box lets weather through. Left, the gap tends to get bigger.
Hamsey homes and the weather
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. With historic houses such as Anne of Cleves House (about 1.9 miles south) nearby, there’s older building stock in the area around Hamsey as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
Rented homes near Cooksbridge station change hands often, and older sash windows in a rental need their mastic kept sound to keep the weather out. Homes close to The Parish Church of St Peter include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Schools such as Hamsey Community Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
Hamsey is about 1 mile north of Lewes, in East Sussex. For sand mastic in and around Hamsey, it’s easy to get a quote: please ring 0345 464 0079 or send us an email. We are based in Crawley and cover East Sussex, Hamsey included. Hamsey is one of 289 places in East Sussex where we work. For nearby work, see our Brighton page.
All of BN8 is covered for sand mastic, from the main roads to the quietest streets. Other places close to Hamsey include Offham (1 mile south-west), South Malling (1 mile south), Lewes (1 mile south), Cliffe (2 miles south) and Southover (2 miles south). Larger places within reach include Eastbourne (14 miles south-east), Seaford (9 miles south-east), Hailsham (11 miles east), Crowborough (13 miles north-east), Uckfield (7 miles north-east) and Newhaven (7 miles south).
What’s near Hamsey
Typical jobs here are in homes near Railway Land, Priory School and The Blacksmiths Arms, among other places. Hamsey’s nearest station is Cooksbridge station, about 0.8 miles north-west. Other landmarks nearby include Lewes Castle (1.6 miles south) and Lewes Victoria Hospital (1.5 miles south). The countryside around Hamsey includes Malling Down and Offham Hill.
Can I do it myself?
A DIY attempt does not rule out a professional job. We remove it and do the joint properly, so tell us about it when you ask for a quote.
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.