East Sussex · England
Sand mastic for sash & case windows in Newhaven, East Sussex
Professional sand mastic in and around Newhaven, with old sealant always removed completely.
- Gaps round a timber door in stone or brick
- Modern sealant on a period surround
- Wind and rain getting in round a sash window
Sand mastic for homes and businesses in Newhaven
We work across Newhaven renewing sand mastic on sash windows and doors. Every joint is cleaned out and filled by hand for a neat, traditional finish. We work on brick reveals, tenement windows and sash and case windows, and people most often call us about draughts and rain around sash boxes and old sand mastic that has cracked, crumbled or fallen out.
Plenty of homes in a town like Newhaven have had conservatories, patio doors or new windows added over the years. Every addition brings more joints, each wearing at its own pace. Sills, frame heads and glazing joints are where leaks usually start.
You get a one-year guarantee, the same in Newhaven as everywhere else we work.
- Place
- Newhaven (BN9)
- Wider area
- East Sussex
- Cover
- One year on every job
- Price
- A clear price before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Newhaven: your questions answered
Does the coastal weather in Newhaven affect outside sealant?
Near the sea, outside joints face more wind, rain and salt than they would inland, so the choice of sealant and the preparation matter even more. Walls facing the sea are generally the first to need attention.
Do you work for landlords with property near Newhaven Town station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. Just ring 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll give you a clear quote.
Will there be a smell?
It depends on the product. Some smell for a while, some hardly at all, and any smell fades as they cure.
Can I add another job to the visit?
Yes. Several rooms, windows or areas can go on one quote.
Do you cover Newhaven?
Yes. We cover Newhaven, as part of our work across South East England, London and Scotland. To book, call 0345 464 0079 or send us an email.
Do you have insurance?
Yes. Full insurance covers our work.
Do I need to be at home?
If the work is inside, we need someone to let us in. Once we’ve agreed the job, you don’t need to watch us work.
Should I use sand mastic or silicone?
Sand mastic usually suits period timber windows best. On modern frames, we’d normally use a flexible sealant.
When to call us in Newhaven
Shallow joints are a common cause. Mastic that’s too thin cracks and drops out, which is why we pack deep voids first and get the depth right.
It’s worth asking for a quote if you see:
- Mastic round period door frames that has failed
- Weathered mastic on the most exposed windows
- Old cement repairs round a window that have failed
- Draughty sash windows at the surround
If you let a flat or house near Newhaven Town station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
What your quote should include
- Are they insured?
- How the surfaces are prepared before sealing
- What happens if they find a problem under the old sealant
- When the joint can take water or movement
What we do, step by step
We bring everything the job needs with us, so there’s nothing for you to buy. After a quick look at the joints together, we protect the area and start. Most jobs take a few hours per window, depending on the condition of the joints. For a job in Newhaven, we need access to where the work is and somewhere nearby to park. For outside work, let us know about side access, gates and any upper-floor joints.
- We check each window surround and the condition of the joint.
- 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
- Clear the area around the work
- Plan for the work area to be out of bounds to pets and children
- Let us know about stairs, lifts or work at height
How to get a quote
For a quick quote, get us on the phone, or email us if that is easier. Describe what needs sealing and we will explain what’s involved and give you a clear quote.
Related advice
What we can’t put right
A few problems are outside what sealant work can do:
- Whether work needs listed building consent
- Masonry that needs repairing
- Rotten sashes, sills or window boxes (a joiner’s job)
Not sure which it is? You can call 0345 464 0079 or email us and we’ll tell you honestly.
Where we work in Newhaven
- Brick reveals
- Tenement windows
- Stone surrounds
- Sash and case windows
- Period & listed homes
- Timber door frames
Windows and doors in Newhaven
Newhaven 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’s hard on the mastic around older windows and doors, especially on the side facing the sea. The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Schools such as UTC@Harbourside are buildings too, and the mastic around its windows and doors needs looking after like any other building’s. Homes close to Church of St Michael and All Angels include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Newhaven is about 8 miles east of Brighton, in East Sussex. For sand mastic in and around Newhaven, it’s easy to get a quote: please call 0345 464 0079 or send us an email. We cover East Sussex from our Crawley base. 289 places in East Sussex are on our list. There’s also a page for Brighton, roughly 8 miles from Newhaven.
Every address in BN9 is covered for sand mastic. You’ll find streets such as High Street, Station Road and Dacre Road. You’ll find Newhaven on the A26 and A259, which makes it straightforward to reach. Other places close to Newhaven include Denton (1 mile north-east), South Heighton (1 mile north), Piddinghoe (1 mile north-west), Tide Mills (1 mile south-east) and Norton (2 miles east). We also work in nearby towns such as Eastbourne (10 miles east), Seaford (3 miles south-east), Lewes (6 miles north), Hailsham (10 miles north-east), Uckfield (12 miles north) and Telscombe (3 miles west). Newhaven is among the bigger towns we cover in East Sussex.
What’s near Newhaven
Typical jobs here are in homes near Harbour Primary and Nursery School, The Ship Hotel and Castle Hill, among other places. There’s a railway station in Newhaven itself: Newhaven Town station. Other landmarks nearby include Chailey Heritage Marine Hospital (1.2 miles south-east) and Newhaven Museum (0.5 miles north-east). For a walk, there’s Itford Hill.
DIY sealant or a professional job?
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it peels away and traps moisture behind it. 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 the joint depth matters as much as the finish.
How we quote for sand mastic
We quote each job individually. This is what makes a difference:
- How much old sealant there is and how hard it is to remove
- Working hours on commercial sites
- Which sealant suits the joint
- Any mould that needs treating
What you pay reflects the work, not guesswork. That is why we ask about the job first and agree the price before starting.
What to tell us for a quote
Photos help, but a description is a good start. Try to tell us:
- If someone has resealed it before
- The type of property
- What the problem is, such as mould, gaps, leaks or cracking
- How many joints, rooms or windows are involved
Getting a quote is simple: let us know what needs doing and where and its rough size. A few pictures by email make the job easier to understand, and we will take it from there.
Towns and villages near Newhaven
Also in Newhaven
What happens if it’s left?
Not every draught comes from the sashes themselves. Open mastic joints round the box can let air in, and renewing the mastic closes them. In Newhaven, as anywhere, most leaks start as a small gap in a joint, and early is when they’re cheapest and quickest to sort.
Rather than a set price list, we price the job in front of us: how many joints, what’s in them now and how we reach them. You’ll know the price before we begin.
Why Newhaven customers choose us
- Tidy, careful work
- We are fully insured
- Any old sealant cut out fully, not covered over
- Homes, businesses and hotels
Read what affects the cost or customer reviews.
Landlord and commercial work in Newhaven
From a single let to a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we will quote.