East Sussex · England
Sand mastic for sash & case windows in Mount Pleasant, East Sussex
Window and door surrounds in Mount Pleasant need attention? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Mastic round period door frames that has failed
- Mastic worn away on windows facing the weather
- Mastic dropping out of the joint
About our sand mastic in Mount Pleasant
On many period windows, sand mastic looks right and suits the building. Newer frames normally get a flexible sealant instead and we’ll explain which is best for yours. If you are dealing with draughts and rain around sash boxes and gaps between timber frames and stone or brick, we can help.
Around Mount Pleasant, many homes face open ground, so their windows and doors take the full weather. Exposed frames and sills lose their mastic sooner than sheltered ones.
A 12-month guarantee comes as standard, so you’re covered after we’ve gone.
- Place
- Mount Pleasant (BN8)
- Wider area
- East Sussex
- Guarantee
- One year on every job
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
What the job involves on each surface
Sash and case windows
Most of our sand mastic work is on sash windows. Each joint round the box is raked out and renewed.
Tenement and terrace windows
Rows of sash windows on tenements and terraces often need renewing together. We can do one window or several.
How it works
The work is kept neat and contained to the joints we’re treating. Expect the work to take a few hours per window, depending on the condition of the joints, and we explain the cure time before we leave. In a small place like Mount Pleasant, access is generally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- First, we look at the surrounds with you and agree what needs doing.
- We rake out the old mastic and clean the joint.
- 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 finish is dressed so it sits neatly against the stone or brick.
Getting ready for the visit
- For indoor joints, keep the area dry beforehand if you can
- Move anything stored near the joints
- Mention any leaks or damp you’ve noticed
How to get a quote
Asking for a quote is easy: let us know the job and the location. Photos by email help us understand the job, and we will come back to you with a quote.
Related advice
What we cannot put right
Some problems need a builder, plumber or other trade rather than us:
- Masonry that needs repairing
- Sashes that need overhauling
- Timber that has rotted
If in doubt, call 0345 464 0079 or drop us an email and we’ll say what we think before booking.
What we seal
- Timber door frames
- Brick reveals
- Period & listed homes
- Sash and case windows
- Stone surrounds
- Tenement windows
What affects the quote in Mount Pleasant
The quote reflects the job in front of us. We look at:
- The amount of work
- How many rooms, windows or areas are involved
- Any mould that needs treating
- When we can work, for business premises
We don’t show prices on the website, because the cost depends so much on the job itself. Call for a quick quote.
What we need to know
You do not need to know the technical terms. It helps if you can tell us:
- Access, such as stairs, a lift or height
- Pictures of the joints, sent by email
- Any previous sealing or DIY work
- The rough size of the job
If you are in Mount Pleasant and need sand mastic, phone 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and we will agree the price before any work begins.
Common problems we fix in Mount Pleasant
Most of it is simply age. Sand mastic is a maintenance item like any pointing and how long it lasts depends on the weather it faces.
The most common problems we see are:
- Old cement repairs round a window that have failed
- Silicone on a period window that looks wrong
- Tired mastic found when preparing windows for paint
- Mastic round period door frames that has failed
For site and facilities teams at buildings such as Barcombe Church of England Primary School, larger buildings have plenty of frames, and the mastic around each one ages.
Before you book anyone
- What preparation is included
- What happens if the job turns out different
- What the cure time is
- What guarantee comes with the work
Also near Mount Pleasant
What else we do in Mount Pleasant
FAQs for Mount Pleasant
Is Mount Pleasant within the area you cover?
Yes, Mount Pleasant is covered. 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.
Do you cover Mount Pleasant for sand mastic?
Yes. We work across London and the South East, and Mount Pleasant is part of that. Just ring 0345 464 0079 or drop us an email with a few details of the job, and we will give you a clear quote.
Do you guarantee sand mastic work?
You get our 12-month guarantee on every job.
How much does sand mastic cost in Mount Pleasant?
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. You will get a clear quote before work begins.
Is it worth trying it myself?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. We can always put it right if it fails.
Can you work on commercial sites?
Yes. Commercial and hotel work is a large part of what we do. We can talk about working times when we quote.
Can I paint the new mastic?
It’s traditionally left unpainted, as guidance on traditional windows advises. Talk to us before any painting near it.
Where is Mr Mastic based?
We are based in Crawley, and we cover South East England, London and all of Scotland.
What sand mastic looks like in Mount Pleasant
With historic houses such as Glyndebourne (about 4.1 miles south-east) nearby, there’s older building stock in the area around Mount Pleasant 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. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you let a flat or house near Cooksbridge station, cracked sand mastic around sash windows lets in the draughts tenants complain about. In the older streets around St Bartholomews, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Mount Pleasant is about 4 miles north of Lewes, in East Sussex. We carry out sand mastic for homes and businesses in Mount Pleasant and nearby, as part of our work across East Sussex. Mount Pleasant is one of 289 towns and villages in East Sussex where we work for sand mastic. We also work in Brighton, about 10 miles from Mount Pleasant.
We cover every part of the BN8 postcode area for sand mastic and the streets around it. Close by, we work in Barcombe Cross (1 mile south-west), Barcombe Mills (1 mile south), Barcombe (1 mile south), Isfield (2 miles east) and Upper Wellingham (2 miles south). Larger places within reach include Eastbourne (15 miles south-east), Seaford (11 miles south), Lewes (4 miles south), Hailsham (11 miles south-east), Crowborough (10 miles north-east) and Uckfield (4 miles north-east).
Near you in Mount Pleasant
Locally, jobs take us to homes and businesses close to Royal Oak pub and Chailey School and the streets around them. The closest station to Mount Pleasant is Cooksbridge station, about 2.5 miles south-west of the centre. Nearby you will also find Museum of Agricultural Bygones (3.9 miles south-east) and Uckfield Community Hospital (4.2 miles north-east). Open spaces near Mount Pleasant include Offham Hill and Malling Down.
Can I do it myself?
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Looking after it afterwards
So the new joints stay in good condition:
- Leave the new mastic unpainted
- Take care around the mastic when scraping paint
- Have rotten timber repaired before new mastic goes in
- Sort the mastic before the decorators arrive
Avoid sealing over the mastic with silicone. If anything cracks, get it looked at rather than patching it.
Fine cracks show the mastic is starting to fail. Renewing it then is simpler than waiting until it falls out.