Kent · England
Sand mastic for sash & case windows in Westwood, Kent
Sand mastic for Westwood, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Weathered mastic on the most exposed windows
- Open joints round the window box
- Silicone on a period window that looks wrong
Can I do it myself?
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
Sand mastic for homes and businesses in Westwood
For a listed home or one in a conservation area, ask your local planning authority whether consent is needed for work to windows. Like-for-like sand mastic is often the preferred finish. If you have mastic that needs renewing before redecorating and mastic round period door frames that has failed, we can help, whatever the surface.
Mastic can only go onto a dry, clean joint, so window work in Westwood is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
Each job carries a 12-month guarantee.
- Place
- Westwood (DA13, DA2)
- Region
- Kent
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Looking after it afterwards
A little care helps the new joints last. We recommend:
- Have rotten timber repaired before new mastic goes in
- Ask the planning authority about consent for listed or conservation-area homes
- Take care around the mastic when scraping paint
- Ask us before painting near the mastic
Leave the new mastic unpainted, as traditional guidance advises. If you are redecorating, ask us first.
An open joint round the box lets weather through. Left, the gap tends to get bigger as more mastic falls out.
Questions from Westwood
Do you cover smaller places like Westwood?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Can you help a landlord with a rental near Longfield station?
Yes, landlords and agents are among the people we work for. Just phone 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll give you a clear quote.
Will the old sealant be removed?
Yes. All of the old material is cut out and the joint cleaned before resealing.
What do you need from me for a quote?
The location, the problem and the rough size of the job. Photos by email help too.
How do I get a quote for sand mastic in Westwood?
Size, access and the old material all affect the cost. Call for a quick quote and we’ll talk you through it.
Is it possible to paint over sand mastic?
Sand mastic is normally left unpainted, which is what traditional guidance recommends. Ask us before decorating.
Which products do you use?
Products from Arbo and Everbuild, among others, chosen to suit the joint. We’ll tell you what we’re using and why.
Will there be a smell?
It depends on the product. Some products have a noticeable smell, others very little.
Places near Westwood
What else we do in Westwood
Surface by surface
Brick reveals
Sand mastic is also used where timber frames meet brick. It suits older brickwork.
Tenement and terrace windows
Upper-floor windows need access planning. Let us know the floor and we’ll confirm access.
Windows and doors in Westwood
Historic houses like Cobham College (about 4.6 miles east) are a reminder that the area around Westwood has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. The South East is one of the drier parts 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 Longfield station, older sash windows in a rental need their mastic kept sound to keep the weather out. Homes close to Church of Saint Mary Magdalene include some older properties, and the joint between an old wall and a newer frame is normally the first place rain gets in. If you look after a building such as Bean Primary School, its window and door frames need their mastic kept sound, just like a home’s.
Westwood is about 3 miles south of Swanscombe, in Kent. From the centre of Westwood to the outskirts, we cover sand mastic for every kind of property, from flats and houses to offices and hotels. Across Kent, we cover 922 places, and Westwood is one of them. There’s also a page for London, about 18 miles away.
Every address in DA13 and DA2 is within our area for sand mastic, from the main roads to the quietest streets. Whether your property is on Westwood Road and Highcross Road or a nearby road, our applicators can take on the job. Other places close to Westwood include Grubb Street (1 mile south-west), Green Street Green (1 mile west), Bean (1 mile north-west), St Margarets (2 miles west) and Darenth (2 miles west). Within a short drive, we also cover Maidstone (14 miles south-east), Dartford (4 miles north-west), Sevenoaks (10 miles south-west), Gravesend (4 miles east), Tonbridge (15 miles south) and Northfleet (3 miles north-east).
Near you in Westwood
Locally, jobs take us to homes and businesses close to Longfield Academy, Longfield Chalk Bank and Railway Tavern and the streets around them. The nearest railway station is Longfield station, about 1 mile south of the centre. Well-known places in the area include Stone Museum of Geology (3.3 miles north-west) and Bluewater (2.3 miles north-west). Green spaces nearby include Sawyers Lake.
What we cannot put right
Sealant isn’t the answer to every problem, and we’ll tell you before we start. It won’t solve:
- Whether work needs listed building consent
- Timber that has rotted
- Damaged stone surrounds
Not sure which it is? You can phone 0345 464 0079 or email us and we will tell you honestly.
Surfaces we seal
- Tenement windows
- Brick reveals
- Sash and case windows
- Stone surrounds
- Timber door frames
- Period & listed homes
Why deal with it now?
Draughts round a sash window are not always the sashes. Gaps between the frame and the wall can be just as bad, and renewing the mastic closes them. Around Westwood, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
The cost reflects the work involved, not guesswork. That’s why we ask a few questions first and agree the price before starting.
Why Westwood customers choose us
- An ARBOMaster approved applicator
- Sanitary silicone with an anti-fungal additive in wet areas
- 20+ years of sealant experience
- One-year guarantee on every job
How the visit works
Our applicators work methodically: protect, prepare, seal, tidy. Typically it takes a few hours for a single window, longer for several, and the area is left clean. Somewhere like Westwood needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- We look at the surrounds with you and agree the joints to renew.
- Old mastic and any loose material are raked out.
- Deep gaps are packed so the mastic sits at the right depth.
- The sand mastic is mixed and pressed into the joint by hand.
- We dress the finish so it sits neatly against the masonry.
How to prepare
- Let us know about parking restrictions
- Tell us about any water getting in
- For business premises, tell us about site rules or sign-in
Getting a quote
Asking for a quote is easy: tell us what needs doing and where. Photos by email help us understand the job.
Read more
How we quote for sand mastic
Some jobs are bigger than they look, and some smaller. What affects the quote:
- The number of rooms or windows
- Whether old sealant or filler has to be cut out
- The product the joint needs
- Any working-time requirements on site
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. We take all of that into account in your quote.
Helping us quote
Before you ask for a quote, have a think about:
- Photos by email, if that is easy
- How we’d reach the joints
- Where the job is, and your postcode
- The type of property
For a quote, call 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. You’ll have a clear quote before any work starts.