West Sussex · England
Sand mastic for sash & case windows in Eastergate, West Sussex
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in Eastergate and across West Sussex. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Tired mastic found when preparing windows for paint
- Crumbling sand mastic round a window
- A silicone bead on a sash window that spoils the look
Sand mastic in Eastergate, done properly
Sand mastic is the traditional way to point the gap between a timber window frame and the stone or brick around it. It’s made from sand and a linseed-oil-based binder, applied by hand. On older homes, it suits the building far better than silicone. If you are dealing with window mastic to renew ahead of painting and gaps round a timber door in stone or brick, we can help, on period & listed homes, tenement windows and stone surrounds alike.
Mastic can only go onto a dry, clean joint, so window work in Eastergate is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Where
- Eastergate (PO20)
- Wider area
- West Sussex
- Guarantee
- 12 months on all our work
- Price
- A clear price before work begins
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
What sealant work cannot fix
Some problems need a builder, plumber or other trade rather than us:
- Damaged stone surrounds
- Sashes that rattle, stick or will not open
- Decisions on consent for listed homes
If in doubt, ring 0345 464 0079 or drop us an email and we will say what we think.
What we seal
- Brick reveals
- Tenement windows
- Stone surrounds
- Timber door frames
- Period & listed homes
- Sash and case windows
Windows and doors in Eastergate
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like Goodwood House (about 4.2 miles north-west) are a reminder that the area around Eastergate has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
Managing a site like Eastergate CofE Primary School? Then its window and door frames need their mastic kept sound, just like a home’s. In the older streets around St George's Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. For landlords with property near Barnham station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Eastergate is about 4 miles north of Bognor Regis, in West Sussex. From the centre of Eastergate to the outskirts, sand mastic is available for homes and businesses alike, from flats and houses to offices and hotels. 371 places in West Sussex are on our list. Portsmouth is on our list too, around 19 miles away.
Our applicators cover all of the PO20 postcode area for sand mastic. Sand mastic is available to properties on St Georges Walk, Highview Road and Critchmere Drive. If you’re just outside Eastergate, we cover Westergate (1 mile west), Nyton (1 mile west), West Barnham (1 mile south-east), Fontwell (1 mile north) and Barnham (1 mile south-east). We also work in nearby towns such as Worthing (11 miles east), Bognor Regis (4 miles south), Chichester (5 miles west), Selsey (9 miles south-west), Littlehampton (6 miles east) and Lancing (15 miles east).
Near you in Eastergate
Around Eastergate, our work takes us to homes and buildings near Ormiston Six Villages Academy, among other places. The nearest railway station is Barnham station, roughly 1 mile south-east of the centre. A little further out are Bognor Regis War Memorial Hospital (3.4 miles south) and Tote Copse Castle (1.5 miles west). The countryside around Eastergate includes WWT Arundel.
Also near Eastergate
Also in Eastergate
DIY sealant or a professional job?
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions.
Questions from Eastergate
Is Eastergate within the area you cover?
Yes, Eastergate 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.
Is Eastergate in your area for sand mastic?
Yes. Our work covers London and the South East, and Eastergate is part of that. Just ring 0345 464 0079 or send us an email with a few details of the job, and we will give you a clear price.
Do I have to be there?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
Is it OK to seal over old sealant?
No, because it fails. We remove every bit of old sealant first, so the new joint bonds to clean surfaces.
Do you hold any approvals?
Yes. We are approved under the ARBOMaster scheme.
Is consent needed for window work on a listed home?
Yes, it’s worth checking. Ask your local planning authority whether consent is needed for work on a listed home or in a conservation area.
How long will you be here?
Typically it takes a few hours for a single window, longer for several. Bigger jobs take longer, and we will say how long yours will take.
Do you have insurance?
Yes. Mr Mastic is fully insured, with over 20 years’ experience in sealant work.
What we do, step by step
Before we leave, we go over the finished joints with you. The visit itself generally takes a few hours per window, depending on the condition of the joints, depending on the size of the job. Somewhere like Eastergate needs a little journey planning: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- Large voids are packed out.
- New sand mastic is applied and shaped by hand.
- We finish the mastic to a tidy line.
Preparing for the visit
- Tell us about any previous sealing or DIY attempts
- Let us know about stairs, lifts or work at height
- Mention any parking rules near the property
Get a quote
For a quote, phone 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. We will give you a clear quote before any work starts.
Advice
Landlord and commercial work in Eastergate
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. Several properties can be quoted together.
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
How to look after the new joints
So the new joints stay in good condition:
- Ask us before painting near the mastic
- Get any rot dealt with first
- Keep modern sealant off the mastic
- Renew mastic before redecorating the windows
Avoid sealing over the mastic with silicone. If anything cracks, get it looked at rather than patching it.
Good mastic helps keep the frame dry. Failed mastic lets water reach the timber and timber that stays wet can rot.
How we quote for sand mastic
You will get a clear quote before we start. It’s based on:
- Working hours on commercial sites
- How much there is to do
- Whether the work is at height
- The number of rooms or windows
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all make a difference, and we’ll explain the quote if you ask.
Helping us quote
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- Any previous sealing or DIY work
- Where the property is
- How many joints, rooms or windows are involved
- Whether it’s a home or a business
Asking for a quote is easy: tell us what needs doing and where, and roughly how big it is. A few pictures by email make the job easier to understand.
How the job changes by surface
Stone surrounds
Stone openings are rarely perfectly straight, so the gap isn’t the same all the way round. Sand mastic is shaped by hand to suit.
Period and listed homes
A traditional finish suits a period property, and sand mastic is one of them.