Greater London · England
Sand Mastic in Perry Vale
Sand mastic for Perry Vale, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Wind and rain getting in round a sash window
- Modern sealant on a period surround
- Old sand mastic that has cracked, crumbled or fallen out
For landlords and businesses
For anyone letting property in or around Perry Vale, several properties can go on one quote. Send us the addresses and the work at each.
We also work for property managers and facilities teams. We can quote a run of properties together.
Sand mastic in Perry Vale, done properly
For a listed home or one in a conservation area, ask your local planning authority whether consent is needed for work to windows. Sand mastic is often favoured as a like-for-like material. If you’re dealing with mastic dropping out of the joint and open joints round the window box, we can put it right, whatever the surface.
Many London homes are flats, with windows high above the street. In a converted house or block, the lease generally says who is responsible for the windows, so it’s worth checking before booking, and access in Perry Vale is something to talk through when you book.
We stand behind the work with a 12-month guarantee, so you are not left on your own once the job is done.
- Location
- Perry Vale (SE23, SE26, SE6)
- Region
- Greater London
- Cover
- A year, on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
What happens on the day
On the day, there’s very little for you to do. Point us to the joints and we’ll get on with it. The job generally takes a few hours for a single window, longer for several, including the tidy-up. In Perry Vale, flats, stairs and shared entrances are part of the routine. If the building has a concierge, managing agent or access rules, tell us when you book.
- Each surround is checked first.
- We rake out the old mastic and clean the joint.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
Preparing for the visit
- Mention if the joints have been sealed before
- Keep children and pets away from the work area
- Try not to wet indoor joints just before the visit
How to get a quote
We quote each job on its own. Just phone 0345 464 0079 or send us an email with the details.
Advice
When something else is needed
We will always be straight with you, so here’s what sealant cannot fix:
- Timber that has rotted
- Damaged stone surrounds
- Cracked or broken glass
If in doubt, call 0345 464 0079 or drop us an email and we will say what we think before you book.
What we seal
- Stone surrounds
- Timber door frames
- Period & listed homes
- Sash and case windows
- Brick reveals
- Tenement windows
Looking after it afterwards
Looking after new joints is easy:
- Ask us before painting near the mastic
- Keep modern sealant off the mastic
- Ask a joiner to look at soft timber first
- Find out about consent before window work on a listed home
Make sure water drains away from the window surround. Water sitting against the mastic shortens its life.
Crumbling mastic lets rain into the joint. It can soak into the frame and the surrounding masonry so early renewal protects both.
FAQs for Perry Vale
Is parking an issue for sand mastic in Perry Vale?
Parking in Perry Vale, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
Do you work for landlords with property near Forest Hill station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. Just ring 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll send you a clear quote.
Do you take out the old sealant first?
Yes. We cut out all the old sealant and clean the joint before applying anything new.
Should I use sand mastic or silicone?
It depends on the window. Period windows in stone or brick generally suit sand mastic and newer frames normally get a flexible sealant.
What guarantee comes with the work?
Our 12-month guarantee covers every job, sand mastic included.
Which products do you use?
It depends on the joint: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
How long does sand mastic take to harden?
The surface skins quite quickly and it hardens fully over a longer time. Timing depends on the weather and the joint.
Does someone need to be in?
It depends on the job. For work indoors, someone needs to let us in.
Places near Perry Vale
What else we do in Perry Vale
Perry Vale homes and the weather
Historic houses like Kingswood House (about 1.7 miles west) are a reminder that the area around Perry Vale 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.
If you look after a building such as Perrymount Primary School, larger buildings have plenty of frames, and the mastic around each one ages. For landlords with property near Forest Hill station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Perry Vale is about 3 miles south of New Cross, in Greater London. Anywhere in SE23, our applicators can take on sand mastic. Our Greater London coverage runs to 764 places, Perry Vale among them.
We work across the SE23, SE26 and SE6 postcode area for sand mastic and the streets around it. We cover properties on Como Road, Mayow Road and South Road and the roads around them. Close by, we work in Bell Green (1 mile south-east), Sydenham (1 mile south-west), Bellingham (1 mile east), Southend (1 mile east) and Forest Hill (1 mile north-west). Within a short drive, we also cover London (5 miles north-west), City of Westminster (7 miles north-west), Marylebone (7 miles north-west), Kensington (8 miles north-west), St Pancras (7 miles north-west) and Shoreditch (6 miles north).
What’s near Perry Vale
Typical jobs here are in homes near Mayow Park, Capitol Cinema pub and Forest Hill School and the streets around them. The closest station to Perry Vale is Forest Hill station, about 0.5 miles north-west. Nearby you’ll also find Lewisham Shopping Centre (2.3 miles north-east) and Greenwich Castle (3.5 miles north-east). Open spaces near Perry Vale include Dacres Wood and Knight's Hill.
When to call us in Perry Vale
Rain on the window surround works into any crack and loosens it further. Exposed elevations usually fail first.
Keep an eye out for any of the following:
- Tired mastic found when preparing windows for paint
- Cement or filler used on old window joints that has cracked
- Gaps between timber frames and stone or brick
- Draughts and rain around sash boxes
As a London address, Perry Vale can be tricky for parking: let us know about parking bays, permits or a driveway.
What your quote should include
- How the colour is chosen
- Who does the work, and how experienced they are
- Whether they seal over old material or remove it
- Which sealant they’ll use, and why
What the job involves on each surface
Period and listed homes
On a listed home or in a conservation area, the right material matters. Sand mastic is often the preferred finish.
Sash and case windows
The box of a sash and case window sits in the stone or brick opening. The gap round it is pointed with sand mastic.
How we quote for sand mastic
For a quick quote, just ask. What matters most is:
- How many rooms, windows or areas are involved
- Access and height
- The size of the job
- Any mould that needs treating
The cost reflects the work involved, not guesswork. That’s why we ask a few questions first.
What we need to know
You do not need to know the technical terms. Just tell us:
- Where the property is
- Whether it has been sealed before
- What’s wrong with the joints now
- Roughly how big the job is
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is. Whenever you’re ready, phone 0345 464 0079 or drop us an email.