East Sussex · England
Sand mastic for sash & case windows in Holywell, East Sussex
Traditional burnt sand mastic around sash and case windows and doors in stone and brick in Holywell, with a one-year guarantee on every job. Call for a quick quote.
- Crumbling sand mastic round a window
- Cracked mastic round a front door frame
- Silicone on a period window that looks wrong
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.
Brick reveals
An open joint at a brick reveal lets weather in. New mastic seals the gap.
Sand mastic in Holywell
For a listed home or one in a conservation area, ask your local planning authority if consent is needed before window work. Sand mastic is often favoured as a like-for-like material. We work on stone surrounds, sash and case windows and brick reveals, and people most often call us about old sand mastic that has cracked, crumbled or fallen out and draughts and rain around sash boxes.
In smaller places like Holywell, homes range from older cottages to newer houses, with windows to match: timber, uPVC and aluminium. Each frame material needs the right sealant against the right wall.
All our work comes with a one-year guarantee.
- Place
- Holywell (BN20, BN21)
- Wider area
- East Sussex
- Cover
- 12 months on all our work
- Quotes
- A clear price before work begins
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
How we quote for sand mastic
Jobs vary more than people expect. What affects the quote:
- How much there is to do
- Which sealant suits the joint
- Working hours on commercial sites
- How much old sealant there is and how hard it is to remove
There are no prices on our website, because each job is priced on what it involves. Call for a quick quote and we will talk you through it.
Asking for a quote
When you contact us, these details help:
- What the problem is, such as mould, gaps, leaks or cracking
- Whether it has been sealed before
- Any access issues, like height or stairs
- The address or postcode of the job
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we’ll explain what’s involved and give you a clear quote.
For landlords and businesses
We also work for property managers and facilities teams in Holywell and across East Sussex. We can quote a run of properties together.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements.
Frames and glazing around Holywell
Holywell is within about 1 mile of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That is hard on the mastic around older windows and doors, especially on the side facing the sea. Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For landlords with property near Eastbourne station, any sash windows need sound mastic to keep draughts and rain out. Managing a site like St John's Meads Church of England Primary School? Then larger buildings have plenty of frames, and the mastic around each one ages.
Holywell is about 2 miles south of Eastbourne, in East Sussex. For sand mastic in and around Holywell, please call 0345 464 0079 or send us an email for a quick quote. We cover East Sussex from our Crawley base, Holywell included. Holywell is one of 289 towns and villages in East Sussex we cover. There’s also a page for Brighton, about 18 miles away.
Work in BN20 and BN21 is quoted and booked the same way as anywhere else. Local streets include Mount Road, Cliff Road and Denton Road, all of which we cover. Nearby, we also carry out sand mastic in Meads (1 mile north-west), Old Town (1 mile north), Upperton (1 mile north), Eastbourne (2 miles north) and Ratton Village (3 miles north). We also work in nearby towns such as Hastings (15 miles north-east), Bexhill-on-Sea (11 miles north-east), Seaford (7 miles west), Lewes (14 miles north-west), Hailsham (8 miles north) and St Leonards (14 miles north-east).
What’s near Holywell
Around Holywell, our work takes us to homes and buildings near Gildredge House, Roedean Moira House and Gildrege Park. The closest station to Holywell is Eastbourne station, roughly 1.2 miles north of the centre. Nearby you’ll also find Eastbourne District General Hospital (2.3 miles north) and Rnli Eastbourne Lifeboat Museum (0.8 miles north-east). Not far away are Combe Hill.
Places near Holywell
Other services in Holywell
What we are called out for in Holywell
Scraping and sanding before painting can loosen old mastic. Many people find it crumbling when they prepare the windows.
Common reasons people contact us include:
- Mastic round period door frames that has failed
- Open joints round the window box
- Failed mastic on an exposed elevation
- Old cement repairs round a window that have failed
If you live in an older home near St John the Evangelist, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
What to look for in a quote
- What happens if the job turns out different
- Which colour the sealant will be
- How much experience the applicator has
- How long to leave it before use
What we do, step by step
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 a few hours for a single window, longer for several. For a job in Holywell, we agree the time, the access and parking before the day. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- 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.
- The mastic is mixed, pressed into the joint by hand and shaped.
- The mastic is finished to sit tidily against the stone or brick.
Getting ready for the visit
- For indoor joints, keep the area dry beforehand if you can
- On commercial sites, let us know about site rules
- Let us know about parking restrictions
Getting a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and add pictures by email if you can.
Advice
Questions from Holywell
Is Holywell within the area you cover?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Does the coastal weather in Holywell affect outside sealant?
Near the sea, outside joints face more wind, rain and salt than they would inland, so preparation and the right sealant matter all the more. It’s worth checking the walls that face the sea first.
Can I add another job to the visit?
Of course. Doing several areas at once is normally more efficient, so mention them when you ask for a quote.
Is it possible to paint over sand mastic?
The usual advice is to leave sand mastic unpainted. Ask us before you decorate around it and we will advise.
Do I have to be there?
For indoor joints, yes, someone needs to let us in. Once we’ve agreed the job, you don’t need to watch us work.
Is there any odour?
There can be a smell while the sealant cures, which fades as it sets. Opening a window helps.
Do you guarantee sand mastic work?
Our one-year guarantee covers every job, sand mastic included.
Do you work for hotels and businesses?
Yes. We work in offices, washrooms, hotels and other commercial premises. We can talk about working times when we quote.
What sealant work can’t fix
Some problems need a builder, plumber or other trade rather than us:
- Cracked or broken glass
- Decisions on consent for listed homes
- Timber that has rotted
If in doubt, phone 0345 464 0079 or send us an email and we will say what we think before booking.
What we seal
- Period & listed homes
- Tenement windows
- Stone surrounds
- Timber door frames
- Brick reveals
- Sash and case windows
Aftercare tips
So the new joints stay in good condition:
- Avoid patching sand mastic with silicone
- Plan mastic work ahead of painting
- Ask a joiner to look at soft timber first
- Avoid heavy scraping on the mastic joint
When preparing windows for paint, take care around the mastic. It can be damaged by heavy scraping.
Renewing mastic before redecorating saves doing it twice. Painting over failed mastic hides the problem for a while.