West Sussex · England
Sand mastic for sash & case windows in Bosham, West Sussex
Sand mastic in Bosham from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Draughty sash windows at the surround
- Old cement repairs round a window that have failed
- Mastic round period door frames that has failed
Sand mastic in Bosham: local notes
Bosham is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on the mastic around older windows and doors, which can dry out and crack sooner where a building faces the weather. Historic houses like Warblington Castle (about 4.9 miles west) are a reminder that the area around Bosham has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
Homes close to The United Reformed Church include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. For landlords with property near Bosham station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Bosham is about 3 miles west of Chichester, in West Sussex. Homes, rented property, offices and hotels in Bosham is covered for sand mastic, old or new, large or small. Every job comes with our one-year guarantee. Across West Sussex, we cover 371 places, Bosham among them. Our Portsmouth page covers work nearby (10 miles or so).
We cover every part of the PO18 postcode area for sand mastic and the streets around it. Whether your property is on High Street, Viking Way and Merryweather Road or anywhere close by, we can help. If you are just outside Bosham, we cover Broadbridge (1 mile north-east), Chidham (1 mile west), Bosham Hoe (1 mile south), Nutbourne (2 miles north-west) and Fishbourne (2 miles east). Within a short drive, we also cover Bognor Regis (8 miles east), Chichester (3 miles east), Selsey (7 miles south-east), Littlehampton (14 miles east), Emsworth (4 miles west) and Rustington (15 miles east).
Near you in Bosham
Around Bosham, our work takes us to homes and buildings near The Berkeley Arms Public House, among other places. For rail, the closest station is Bosham station, roughly 0.8 miles north-east. A little further out are Chichester Cathedral Treasury (3.2 miles east) and St Richard's Hospital (3.8 miles east). The countryside around Bosham includes Nutborne Marshes and Stoke Down.
About our sand mastic in Bosham
Our applicators renew the sand mastic around sash and case windows and doors in stone and brick. Out comes the old, loose mastic, the joint is prepared and new mastic is shaped by hand. We work on tenement windows, brick reveals and period & listed homes, and the jobs we see most are silicone on a period window that looks wrong and gaps round a timber door in stone or brick.
Homes in small places like Bosham often stand in the open, with little to shelter their windows from wind and rain. That exposure dries out and cracks the mastic around frames and sills faster.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Where
- Bosham (PO18)
- Region
- West Sussex
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Bosham: your questions answered
Does the coastal weather in Bosham affect outside sealant?
Coastal weather is harder on outside sealant: there’s more wind-driven rain and, closer to the shore, salt in the air. The right product, a clean joint and the right depth all help it cope.
Do you work for landlords with property near Bosham station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. Just phone 0345 464 0079 or email us with the address and what needs doing, and we will send you a clear quote.
How long does sand mastic take to go off?
The surface skins quite quickly and it hardens fully over a longer time. The weather and joint depth both affect it.
Do you cover Bosham?
Yes, we do. Bosham is part of the area we cover.
What information do you need?
The location, the problem and the rough size of the job. If you can, email a few pictures.
Should I try DIY first?
Some simple jobs can be done by a careful DIYer. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Should I use sand mastic or silicone?
We’ll talk it through with you. Period homes often look best with sand mastic, and modern sealants suit newer frames.
Do you work for hotels and businesses?
Yes. Hotels, offices and other businesses use us, and we are fully insured.
What affects the cost of sand mastic
We quote each job individually. These are the things that affect it:
- The number and length of the joints
- How many areas need sealing
- Working hours on commercial sites
- Whether there’s mould to deal with
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote.
Asking for a quote
When you call or email, it’s useful to know:
- A few photos by email, if you can
- Any previous sealing or DIY work
- Whether it’s a home or a business
- What’s wrong with the joints now
For sand mastic in Bosham, phone 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and we will agree the price before any work begins.
DIY versus a professional finish
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Ask the planning authority about consent for listed or conservation-area homes
- Leave the new mastic unpainted
- Keep modern sealant off the mastic
- Ask a joiner to look at soft timber first
Avoid painting over the new mastic, which is the traditional advice. If you are redecorating, ask us first.
Renewing mastic before redecorating saves doing it twice. Painting over failed mastic hides the problem for a while.
The process
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. It normally takes anything from a few hours to a full day, depending on how many windows. Somewhere like Bosham needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- We look at the surrounds with you and agree the joints to renew.
- We remove the old, loose mastic.
- Deep gaps are packed so the mastic sits at the right depth.
- We apply the mastic by hand and shape it.
- The surface is finished to suit the stone or brick.
Preparing for the visit
- For business premises, tell us about site rules or sign-in
- Where the joints are inside, avoid wetting them before we arrive
- Tell us about access, such as stairs, a lift or high-level joints
Ask for a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we will explain how we’d tackle it. When it suits you, call 0345 464 0079 or drop us an email.
Read more
Also in Bosham
Do you need sand mastic in Bosham?
Timber frames move with the seasons. That movement opens up the mastic joint over time.
The problems people generally mention when they call are:
- Draughty sash windows at the surround
- Modern sealant on a period surround
- Failed mastic on an exposed elevation
- Old sand mastic that has cracked, crumbled or fallen out
Managing a site like Bosham Primary School? Then larger buildings have plenty of frames, and the mastic around each one ages.
Before you book anyone
- How the joint is cleaned and prepared
- How much experience the applicator has
- How long to leave it before use
- What happens if the job turns out different
When something else is needed
We will always be straight with you, so here’s what new sealant won’t do:
- Sash cords, weights and draught-proofing of the sashes
- Decayed frames that need repair
- Crumbling stone or brickwork round the window
If you’re not sure, just phone 0345 464 0079 or email us and we will give you a straight answer.
Joints and surfaces we work on
- Sash and case windows
- Tenement windows
- Brick reveals
- Period & listed homes
- Stone surrounds
- Timber door frames
For landlords and businesses
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements.
Failed sealant is one of the commonest items on a check-out report. Several properties can be quoted together.