West Sussex · England
Sand mastic for sash & case windows in Cocking, West Sussex
Professional sand mastic in and around Cocking, with old sealant always removed completely and a 12-month guarantee.
- A silicone bead on a sash window that spoils the look
- Mastic dropping out of the joint
- Mastic worn away on windows facing the weather
Windows and doors in Cocking
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 Cowdray House (about 2.6 miles north) are a reminder that the area around Cocking 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 is traditional sand mastic.
Around Cocking, as everywhere, sand mastic is only as good as the preparation behind it.
Cocking is about 8 miles north of Chichester, in West Sussex. Across the GU29 area, our applicators can take on sand mastic. Cocking is one of 371 places in West Sussex where we work. There’s also a page for Portsmouth, roughly 17 miles from Cocking.
Jobs for sand mastic in GU29 is quoted and booked the same way as anywhere else. We cover properties on Bell Lane, The Croft and Cherry Close. Neighbouring places we cover for sand mastic include Bepton (1 mile north-west), Heyshott Green (1 mile north-east), Cocking Causeway (1 mile north), Heyshott (1 mile east) and Bepton Common (2 miles north). Within a short drive, we also cover Bognor Regis (12 miles south), Chichester (8 miles south), Selsey (15 miles south), Littlehampton (14 miles south-east), Emsworth (11 miles south-west) and Rustington (14 miles south-east).
Local landmarks in Cocking
Other landmarks nearby include Midhurst Community Hospital (3 miles north) and Midhurst Museum (2.5 miles north). Not far away are Levin Down and Iping and Stedham Commons.
Sand mastic in Cocking, 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 period homes, it looks right where silicone wouldn’t. Common call-outs are for old cement repairs round a window that have failed and silicone on a period window that looks wrong, on sash and case windows, timber door frames and brick reveals.
Homes in small places like Cocking often stand in the open, with little to shelter their windows from wind and rain. Exposed frames and sills lose their mastic sooner than sheltered ones.
Each job carries a 12-month guarantee, whatever its size.
- Place
- Cocking (GU29)
- Region
- West Sussex
- Cover
- A year, on every job
- Quote
- A clear price before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Towns and villages near Cocking
Other services in Cocking
How it works
On the day, we start by going over the job with you, so there are no surprises. We protect the surfaces around the joints before we start. Most jobs take a few hours per window, depending on the condition of the joints. For a village or hamlet like Cocking, the journey is planned in advance: 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.
- We fill deep gaps so the new mastic is not too thick.
- We point the joint with sand mastic by hand.
- We finish the mastic to a tidy line.
Before we arrive
- For business premises, tell us about site rules or sign-in
- For indoor joints, keep the area dry beforehand if you can
- Tell us about access, such as stairs, a lift or high-level joints
Ask for a quote
Getting a quote is simple: let us know the job and the location, and roughly how big it is. Photos by email help us understand the job, and we will come back to you with a quote.
Read more
Why it’s worth doing now in Cocking
New sash windows are a major, costly change and on a listed home, consent may be needed. If the frames are sound, renewing the mastic deals with gaps and draughts at the surround. Older cottages and farmhouses around Cocking can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
There are no prices on our website, because each job is priced on what it involves. For a quick quote, please ring 0345 464 0079 or send us an email and we will talk you through it.
Why book with us
- Rated 4.9 stars on Google
- Every job guaranteed for a year
- Anti-fungal silicone where joints get wet
- Old sealant always removed completely
See what affects the cost and what customers say.
Different surfaces, different methods
Timber door frames
Door frames get knocked and soaked, so their mastic can fail sooner. It’s renewed by hand.
Tenement and terrace windows
In shared buildings, the windows may be part of a wider repair, so check who is responsible first.
Honest limits
To be straight with you, some problems need a different trade:
- Masonry that needs repairing
- Timber that has rotted
- Cracked or broken glass
If in doubt, phone 0345 464 0079 or drop us an email and we will say what we think.
Joints and surfaces we work on
- Timber door frames
- Period & listed homes
- Brick reveals
- Stone surrounds
- Sash and case windows
- Tenement windows
How we quote for sand mastic
You will get a clear quote before any work starts. It’s based on:
- How much old sealant there is and how hard it is to remove
- How many rooms, windows or areas are involved
- How easy the joints are to reach
- Any working-time requirements on site
Doing several joints on one visit normally makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. We’ll give you a clear price for the lot.
Helping us quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- Roughly how big the job is
- What the problem is, such as mould, gaps, leaks or cracking
- A few pictures by email, if you can
- How we’d reach the joints
We do not publish a price list, as no two jobs are quite the same. Instead, we give you a clear price for your job. To arrange one, ring 0345 464 0079 or email us.
Aftercare tips
Aftercare is simple, and it makes a real difference:
- Renew mastic before redecorating the windows
- Take care around the mastic when scraping paint
- Keep modern sealant off the mastic
- Don’t paint over the new mastic
Do not run silicone over the new mastic. If anything cracks, get it looked at rather than patching it.
Small cracks are a sign the mastic is ageing. Renewing it then is simpler than waiting until it falls out.
Cocking questions
Is there a guarantee on sand mastic in Cocking?
Every job comes with our one-year guarantee, wherever it is. We’re also fully insured and ARBOMaster approved.
Do you cover Cocking for sand mastic?
Yes. Our work covers London and the South East, and Cocking is part of that. You can call 0345 464 0079 or email us and tell us what needs doing.
Are you ARBOMaster approved?
Yes. We’re approved under the ARBOMaster scheme.
Do you remove the old sealant?
Yes. We cut out all the old sealant and clean the joint before resealing.
Can old silicone round a sash window be swapped for sand mastic?
Yes, we do this often. The old silicone has to come out completely so the mastic beds in well.
Is it worth trying it myself?
You can, for simple jobs. Preparation is everything: all the old sealant out, and a clean, dry joint. If it does not work out, we can redo it.
Is sand mastic better than silicone for my windows?
We’ll talk it through with you. Sand mastic suits many period homes, and modern sealants suit newer frames.
Can sand mastic be painted?
It’s traditionally left unpainted, as guidance on traditional windows advises. Ask us before decorating.
Common problems we fix in Cocking
Water gets into small cracks in the mastic and pushes it out. Windows facing the weather tend to go first.
If you can see any of these, it’s time to have the joints looked at:
- A silicone bead on a sash window that spoils the look
- Mastic round period door frames that has failed
- Mastic dropping out of the joint
- Wind and rain getting in round a sash window
If you live in an older home near St Catherine of Siena Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Before booking anyone
- When the joint can take water or movement
- What insurance they hold
- How long the guarantee is
- How much experience the applicator has