East Sussex · England
Sand mastic for sash & case windows in Upper Dicker, East Sussex
We cover Upper Dicker for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old material cut out, joints cleaned and sealed neatly.
- Old sand mastic that has cracked, crumbled or fallen out
- Weathered mastic on the most exposed windows
- Draughty sash windows at the surround
Honest limits
New sealant cannot fix everything, and we’d rather say so up front. It won’t solve:
- Decisions on consent for listed homes
- Broken panes
- Sash cords, weights and draught-proofing of the sashes
If in doubt, phone 0345 464 0079 or email us and we will say what we think before you book.
Surfaces we seal
- Period & listed homes
- Tenement windows
- Sash and case windows
- Stone surrounds
- Brick reveals
- Timber door frames
About our sand mastic in Upper Dicker
Sand mastic suits most period window surrounds. Newer frames generally get a flexible sealant instead, and we’ll talk through which suits your home. We are often asked to deal with mastic that needs renewing before redecorating and patchy fillers round a sash window, across sash and case windows, period & listed homes and timber door frames.
Mastic can only go onto a dry, clean joint, so window work in Upper Dicker is booked around the forecast. Let us know about access to all the frames, upstairs ones included.
Your job is guaranteed for a year, as with all our work.
- Place
- Upper Dicker (BN27)
- Region
- East Sussex
- Guarantee
- 12 months on all our work
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Also near Upper Dicker
More services for Upper Dicker
How it works
Once we’re on site, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. Most jobs then take anything from a few hours to a full day, depending on how many windows. Somewhere as small as Upper Dicker, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- Each surround is checked first.
- The joint is raked out and cleaned.
- Large voids are packed out.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
How to prepare
- Tell us about any previous sealing or DIY attempts
- Mention any tricky access
- Move anything stored near the joints
How to get a quote
If you’re in Upper Dicker and need sand mastic, phone 0345 464 0079 or drop us an email. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Related advice
Common problems we fix in Upper Dicker
Timber frames move with the seasons. That movement opens up the mastic joint over time.
Common reasons people contact us include:
- Silicone on a period window that looks wrong
- Gaps where the frame meets the masonry
- Crumbling sand mastic round a window
- Mastic round period door frames that has failed
Homes close to Holy Trinity include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Comparing quotes
- Whether the sealant suits the joint
- What happens if the job turns out different
- How the joint is cleaned and prepared
- Whether they seal over old material or remove it
What sand mastic looks like in Upper Dicker
Historic houses like Michelham Priory (about 0.6 miles south-east) are a reminder that the area around Upper Dicker 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. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Schools such as Bede's Prep School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages. If you let a flat or house near Berwick (Sussex) station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Upper Dicker is about 2 miles west of Hailsham, in East Sussex. Whether you’re in the middle of Upper Dicker or further out, we cover sand mastic for every kind of property, from flats and houses to offices and hotels. 289 places in East Sussex are on our list, from the larger towns to small villages. You can also see our page for Brighton, roughly 15 miles from Upper Dicker.
Work in BN27 is quoted and booked the same way as anywhere else. That includes homes and businesses on Camberlot Road, Old Forge Close and Coldharbour Road. If you’re just outside Upper Dicker, we cover Lower Dicker (1 mile north-east), Tile Hurst (1 mile east), Lower Horsebridge (2 miles north-east), Nash Street (2 miles north) and Upper Horsebridge (2 miles east). Larger places within reach include Eastbourne (7 miles south-east), Bexhill-on-Sea (12 miles east), Seaford (8 miles south-west), Lewes (9 miles west), Crowborough (13 miles north) and St Leonards (15 miles east).
Local landmarks in Upper Dicker
We work in homes and buildings around The Plough Inn, Park Mead Primary School and Hailsham Community College. For rail, the closest station is Berwick (Sussex) station, about 2.5 miles south-west of the centre. A little further out are Agricultural Museum (3.6 miles south) and Hellingly Hospital Railway (2.8 miles north-east). The countryside around Upper Dicker includes Firle Beacon.
What affects the quote in Upper Dicker
The price is agreed before any work begins. It’s based on:
- Which sealant suits the joint
- How many areas need sealing
- Whether old sealant or filler has to be cut out
- Whether there’s mould to deal with
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all play a part.
Asking for a quote
Photos by email are helpful but not essential. Try to tell us:
- Photos by email, if that is easy
- The type of property
- Any previous sealing or DIY work
- The address or postcode of the job
For a quote, phone 0345 464 0079 or email us and tell us where the job is and what the problem looks like. We’ll give you a clear quote before any work starts.
Keeping the joints in good condition
Good habits help new joints last longer. Our tips:
- Plan mastic work ahead of painting
- Check the mastic when you check the paintwork
- Make sure water runs off the sill
- Get any rot dealt with first
Don’t touch or press the mastic while it hardens. It skins over quickly, but takes longer to harden fully.
Gaps round a sash box let in draughts and rain. The longer it’s left, the more the joint opens as more mastic falls out.
What happens if it’s left?
Replacing sash windows is a big decision for a period home and on a listed home, consent may be needed. Where the frames are in good order, new mastic seals the surround. Around Upper Dicker, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
A few things move the cost up or down: the old material and how easily it comes out, any mould to treat, and whether the work is at height. We take all of that into account in your quote.
What you get with us
- We leave the area clean and tidy
- Anti-fungal sanitary silicone in wet areas
- Arbo and Everbuild products
- Domestic, commercial and hotel work
FAQs for Upper Dicker
Can you do sand mastic in Upper Dicker?
Yes, Upper Dicker is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or email us with a few details of the job.
Can you help a landlord with a rental near Berwick (Sussex) station?
Yes. We work for letting agents and landlords as well as householders, and several properties can go on one quote. You can phone 0345 464 0079 or email us with the details for a clear quote.
Can I paint the new mastic?
Traditional guidance is not to paint over sand mastic. Ask us before you decorate around it and we’ll advise.
Do you offer different sealant colours?
Usually, yes. Sealants come in white, clear, grey and other colours for many products, and we will agree it with you first.
Do you take out the old sealant first?
Yes, every time. New silicone does not stick to old silicone, so any old material comes out before anything new goes in.
How long does sand mastic take to go off?
Not straight away. It skins first and hardens fully later and we will give you an idea for your job.
Can old silicone round a sash window be swapped for sand mastic?
Often, yes. With the silicone removed and the joint cleaned we point it with sand mastic.
Do you have insurance?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
How the job changes by surface
Sash and case windows
On a sash window, the mastic joint shows on the outside, so a neat, even finish matters.
Timber door frames
Round a period front door, sand mastic gives the right look.