West Sussex · England
Sand Mastic in Flansham
Sand mastic in Flansham from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Mastic round period door frames that has failed
- Patchy fillers round a sash window
- Mastic worn away on windows facing the weather
Sand mastic in Flansham
We work across Flansham renewing sand mastic on sash windows and doors. Each joint is raked out, prepared and pointed by hand for a neat, traditional finish. We work on sash and case windows, tenement windows and brick reveals, and common reasons people get in touch are draughts and rain around sash boxes and open joints round the window box.
Around Flansham, 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.
All of our work is guaranteed for twelve months, and the guarantee is the same wherever you are.
- Location
- Flansham (PO22)
- Region
- West Sussex
- Cover
- One year on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
How we quote for sand mastic
We don’t publish a price list, because jobs vary so much. The quote depends on:
- Any mould that needs treating
- Whether old sealant or filler has to be cut out
- Which sealant suits the joint
- The amount of work
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs, along with when we can work on site. Ask us for a quote and we will go through it with you.
What we need to know
To help us quote quickly, let us know:
- Whether it has been sealed before
- The rough size of the job
- Where the job is, and your postcode
- How we’d reach the joints
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and add photos by email if you can.
The process
On the day, there’s very little for you to do. Show us the job and we’ll take it from there. The work itself takes anything from a few hours to a full day, depending on how many windows. In a small place like Flansham, access is usually the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- Each surround is checked first.
- We rake out the old mastic and clean the joint.
- We fill deep gaps so the new mastic is not too thick.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
Preparing for the visit
- Where the joints are inside, avoid wetting them before we arrive
- Keep pets and children clear of the area while we work
- Tell us about access, such as stairs, a lift or high-level joints
Getting a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll explain how we’d tackle it. When it suits you, call 0345 464 0079 or drop us an email.
Advice
Different surfaces, different methods
Stone surrounds
The stone is treated with care while raking out the old mastic.
Sash and case windows
Most of our sand mastic work is on sash windows. We renew the mastic round each box.
Your questions about sand mastic in Flansham
Does the coastal weather in Flansham affect outside sealant?
Coastal homes put outside sealant through more weather than inland ones, so preparation and the right sealant matter all the more. It’s worth checking the walls that face the sea first.
Can you help a landlord with a rental near Barnham station?
Yes. We work for landlords and agents as well as householders. You can ring 0345 464 0079 or drop us an email with the details for a clear quote.
Do you have insurance?
Yes. Mr Mastic is fully insured, and we’ve been doing sealant work for more than 20 years.
Should I try DIY first?
You can, for simple jobs. The key is preparation: remove all the old material and work on a clean, dry joint. If it doesn’t work out, we can redo it.
Will there be a smell?
That depends on the sealant. Some smell for a while, some hardly at all, and any smell fades as they cure.
Can you work on commercial sites?
Yes. Hotels, offices and other businesses use us, and we’re fully insured.
Should I check with the council before work on a listed or conservation-area home?
Checking first is sensible. Ask your local planning authority whether consent is needed for listed or conservation-area properties.
Do you come to Flansham?
We do. Flansham is part of the area we cover.
Looking after it afterwards
Looking after new joints is easy:
- Find out about consent before window work on a listed home
- Check the mastic when you check the paintwork
- Plan mastic work ahead of painting
- Do not paint over the new mastic
Leave the new mastic unpainted, which is the traditional advice. Ask us before any decorating around it.
Good mastic helps keep the frame dry. Failed mastic lets water reach the timber, which can lead to rot.
Landlord and commercial work in Flansham
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
Landlords and letting agents in Flansham can book us as well as householders. Sealant work between tenants is a simple way to keep a property in good order.
Common problems we fix in Flansham
Paint, silicone or cement used over old mastic causes problems. They don’t suit the joint and we normally remove them.
It’s worth asking for a quote if you see:
- Gaps between timber frames and stone or brick
- Patchy fillers round a sash window
- A silicone bead on a sash window that spoils the look
- Wind and rain getting in round a sash window
If you look after a building such as Bishop Tufnell CofE Primary School, larger buildings have plenty of frames, and the mastic around each one ages.
Comparing quotes
- Whether they’re fully insured
- How the surfaces are prepared before sealing
- Who does the work, and how experienced they are
- Whether all the old sealant comes out first
Places near Flansham
More services for Flansham
Can I do it myself?
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
Frames and glazing around Flansham
Flansham is within about 2 miles of the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. 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, 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 Barnham station, older sash windows in a rental need their mastic kept sound to keep the weather out. Homes close to Bilsham Chapel include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Flansham is about 2 miles north-east of Bognor Regis, in West Sussex. Flansham gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Flansham is one of 371 towns and villages in West Sussex we cover for sand mastic. There’s also a page for Portsmouth, about 19 miles away.
All of PO22 is covered for sand mastic. Close by, we work in Bilsham (1 mile east), Lidsey (2 miles north-west), Shripney (2 miles west), Yapton (2 miles north-east) and Barnham (2 miles north). We also work in nearby towns such as Worthing (11 miles east), Chichester (7 miles west), Selsey (8 miles south-west), Littlehampton (5 miles east), Lancing (14 miles east) and Emsworth (13 miles west).
Local landmarks in Flansham
Around Flansham, our work takes us to homes and buildings near Felpham Community College and The Brooks Local Nature Reserve. The nearest railway station is Barnham station, roughly 1.9 miles north of the centre. Well-known places in the area include Tote Copse Castle (3.1 miles north-west) and Bognor Regis Museum (2.3 miles south-west).