West Sussex · England
Westergate Sand Mastic
We cover Westergate for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly.
- Mastic worn away on windows facing the weather
- Gaps where the frame meets the masonry
- Mastic round period door frames that has failed
How we handle sand mastic in Westergate
Sand mastic skins over fairly quickly, but it takes longer to harden fully. Traditional guidance is not to paint over it and we will advise if you are redecorating. If you are dealing with mastic worn away on windows facing the weather and cracked mastic round a front door frame, we can put it right.
In a smaller place like Westergate, some walls face open ground and catch the full force of the weather. That is hard on the mastic around frames and sills.
Your job is guaranteed for a year, as with all our work.
- Where
- Westergate (PO20)
- Region
- West Sussex
- Cover
- 12 months on all our work
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
When to call us in Westergate
Water gets into small cracks in the mastic and loosens it further. Exposed elevations normally fail first.
Look out for any of the following:
- Mastic dropping out of the joint
- Patchy fillers round a sash window
- Silicone on a period window that looks wrong
- Draughty sash windows at the surround
Goodwood House, about 4 miles north-west, is one of the historic houses in the wider area around Westergate.
What your quote should include
- Who turns up on the day
- Whether VAT is included
- Whether the sealant suits the joint
- How hidden problems are handled
What we do, step by step
Our applicators work methodically: protect, prepare, seal, tidy. Typically it takes a few hours per window, depending on the condition of the joints. For a job in Westergate, we agree the time, the access and parking before the day. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- First, we look at the surrounds with you and agree what needs doing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic is not too thick.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- The mastic is finished to sit tidily against the stone or brick.
Getting ready for the visit
- Where the joints are inside, avoid wetting them before we arrive
- Let us know if you’ve seen damp or leaks
- On commercial sites, let us know about site rules
Ask for a quote
It all starts with a short chat. Describe the problem, the location and the size of the job, and we will talk you through what we’d do. Whenever you are ready, call 0345 464 0079 or send us an email.
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Also near Westergate
What else we do in Westergate
What happens if it’s left?
Not every filler suits an old window surround. Sand mastic matches what was there and that can be important for listed homes. In an older home around Westergate, damp from a failed joint can get into timber and plaster, and that’s a much bigger job than renewing the sealant.
Doing several joints on one visit normally makes better use of the time than several visits. You’ll get one clear quote for the whole job.
Why book with us
- 4.9 on Google from 180+ five-star reviews
- Over 20 years’ experience
- We never seal over old sealant
- Fully insured
See our cost guide and what customers say.
Common questions in Westergate
Will you come out to Westergate?
Yes, we do. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Is Westergate in your area for sand mastic?
Yes. Our work covers London and the South East, and Westergate is part of that. You can phone 0345 464 0079 or send us an email and let us know what needs doing, and we’ll send you a clear quote.
How much does sand mastic cost in Westergate?
There’s no set price, as it depends on the job: how much there is, what’s there now, how we reach it and what it needs. We agree the price before any work begins.
Where do you work from?
We are based in Crawley, and we work across South East England, London and Scotland.
Can you match the sealant colour?
Yes. Sealants come in white, clear, grey and other colours, and we’ll agree it with you first.
Do you work for landlords and businesses?
Yes, often. We can quote for several properties at once.
Do you take out the old sealant first?
Yes, every time. New silicone doesn’t stick to old silicone, so any old material comes out before anything new goes in.
What exactly is sand mastic?
Sand plus a binder based on linseed oil. It’s applied by hand and finished to sit neatly against the masonry.
Landlords, agents and businesses in Westergate
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance.
From a single let to a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
Should I try it myself first?
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
What affects the cost of sand mastic
The quote reflects the job in front of us. We take into account:
- The amount of work
- Access and height
- How many areas need sealing
- Whether old sealant or filler has to be cut out
What it costs depends on the amount of work, how hard the old material is to remove and access to the work. We give a clear quote before work begins.
Helping us quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- If someone has resealed it before
- A few pictures by email, if you can
- The problem you’ve noticed
- Any access issues, like height or stairs
For a quick quote, get us on the phone, or email us if that’s easier. Describe what needs sealing and we’ll explain what’s involved and give you a clear price.
Sand mastic in Westergate: local notes
Historic houses like Goodwood House (about 4 miles north-west) are a reminder that the area around Westergate has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window. 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.
For landlords with property near Barnham station, any sash windows need sound mastic to keep draughts and rain out. For site and facilities teams at buildings such as Aldingbourne Primary School, larger buildings have plenty of frames, and the mastic around each one ages.
Westergate is about 3 miles north of Bognor Regis, in West Sussex. Westergate gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Westergate is one of 371 towns and villages in West Sussex where we work for sand mastic. You can also see our page for Portsmouth, about 18 miles away.
Every address in PO20 is covered for sand mastic. Local streets include Oaks Close, Westergate Street and Rosvara Avenue, all of which we cover. Neighbouring places we cover for sand mastic include Nyton (1 mile north-west), Eastergate (1 mile east), Aldingbourne (1 mile west), Norton (1 mile north-west) and West Barnham (1 mile east). Larger places within reach include Worthing (12 miles east), Bognor Regis (3 miles south), Chichester (5 miles west), Selsey (9 miles south-west), Littlehampton (6 miles east) and Lancing (15 miles east).
Local landmarks in Westergate
Typical jobs here are in homes near Ormiston Six Villages Academy, among other places. For rail, the closest station is Barnham station, roughly 1.3 miles east of the centre. Other landmarks nearby include Tote Copse Castle (1 mile west) and Bognor Regis War Memorial Hospital (3.1 miles south).
What we can’t put right
New sealant can’t fix everything, and we’d rather say so up front. It will not solve:
- Decayed frames that need repair
- Sashes that need overhauling
- Whether work needs listed building consent
Not sure which it is? You can call 0345 464 0079 or drop us an email and we’ll tell you honestly before booking.
Surfaces we seal
- Tenement windows
- Period & listed homes
- Brick reveals
- Timber door frames
- Stone surrounds
- Sash and case windows