Greater London · England
Sand Mastic in Blendon
Problem with your window and door surrounds in Blendon? We cut out the old, prepare the joints and apply the right sealant, with a one-year guarantee.
- Failed mastic on an exposed elevation
- Gaps round a timber door in stone or brick
- Gaps between timber frames and stone or brick
How we handle sand mastic in Blendon
On many period windows, sand mastic looks right and suits the building. Newer frames generally get a flexible sealant instead, and we will talk through which suits your home. If you have tired mastic found when preparing windows for paint and cement or filler used on old window joints that has cracked, we can put it right, whatever the surface.
London’s Victorian and Edwardian terraces were built with timber sash windows, and many still have them or their replacements. Either way, the mastic between frame and brickwork is what stops draughts and rain getting in, in Blendon as anywhere.
We guarantee the work for a year. If something is not right with it in that time, tell us and we will put it right.
- Place
- Blendon (DA5, DA15, DA6)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Windows and doors in Blendon
In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
In the older streets around St James the Great, frames set in older brick or stone need a sealant that suits the wall as well as the frame. Blendon is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. For landlords with property near Albany Park station, any sash windows need sound mastic to keep draughts and rain out.
Blendon is about 1 mile south-east of Welling, in Greater London. If you need sand mastic in Blendon, it’s easy to get a quote: please ring 0345 464 0079 or drop us an email. We cover Greater London from our Crawley base. Our Greater London coverage runs to 764 places, Blendon among them. We also work in London, around 10 miles away.
Our applicators cover all of DA5, DA15 and DA6 for sand mastic and the streets around it. That includes homes and businesses on Penn Lane, Hurst Road and Brook Lane and the roads around them. You’ll find Blendon on the A221, which makes it straightforward to reach with everything needed for sand mastic. Close by, we work in Bexley (1 mile south-east), Crook Log (1 mile north), Welling (1 mile north-west), Upton (1 mile north-east) and Bexleyheath (1 mile north-east). Further out, we also cover London (10 miles west), City of Westminster (13 miles west), Marylebone (13 miles north-west), Kensington (14 miles west), St Pancras (12 miles north-west) and Shoreditch (10 miles north-west).
Landmarks near Blendon
Around Blendon, our work takes us to homes and buildings near Danson Park, The Royal Oak Public House and Hurst Primary School and the streets around them. Blendon’s nearest station is Albany Park station, roughly 0.8 miles south. Other landmarks nearby include Metropolitan Police Museum (1.3 miles south-west) and Bexley Hospital (0.8 miles north-east). Green spaces nearby include Wansunt Pit and Summer Hill.
Also in Blendon
FAQs for Blendon
Is parking an issue for sand mastic in Blendon?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
Can you help a landlord with a rental near Albany Park station?
Yes. We work for letting agents and landlords as well as householders, 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 will give you a clear quote.
Can I add another job to the visit?
Yes. Tell us about everything you’d like done and we will quote it together.
Do you have insurance?
Yes, we are fully insured for every job we do.
Do I need permission for sand mastic on a listed building?
Checking first is sensible. Ask your local planning authority whether consent is needed for listed or conservation-area properties.
What guarantee comes with the work?
There’s a 12-month guarantee on every job.
Can sand mastic be painted?
It’s traditionally left unpainted, as guidance on traditional windows advises. Talk to us before any painting near it.
Do you take out the old sealant first?
Yes, always, and completely. New silicone doesn’t stick to old silicone, so the joint is cleaned back first.
When something else is needed
We’d rather tell you now than do work that will not last, so here’s what sealant can’t put right:
- Whether work needs listed building consent
- Decayed frames that need repair
- Masonry that needs repairing
If you’re not sure, just phone 0345 464 0079 or send us an email and we’ll give you a straight answer.
Surfaces we seal
- Period & listed homes
- Stone surrounds
- Brick reveals
- Sash and case windows
- Timber door frames
- Tenement windows
Work for landlords, hotels and businesses
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
We work for landlords and agents as well as householders. Resealing between tenancies keeps a property looking cared for before the next move-in.
Different surfaces, different methods
Tenement and terrace windows
Windows above ground floor need the right access. Let us know the floor and we will confirm access.
Stone surrounds
We take care not to mark the stone when the old mastic comes out.
Aftercare tips
Aftercare is simple:
- Inspect the joints round the windows every year or so
- Sort the mastic before the decorators arrive
- Take care around the mastic when scraping paint
- Ask us before painting near the mastic
Check the mastic when you check the paintwork. Catching cracks early keeps repairs small.
It’s best to renew mastic before painting the windows. Paint over cracked mastic only covers it up.
Why deal with it now?
Filling over old, loose mastic doesn’t last. We remove the loose material first so the new work lasts. Damp from a failed joint spreads quietly in older London brickwork and timber, and by the time it shows on a wall or ceiling in Blendon, the repair is bigger than the sealant job would have been.
Homes and businesses are quoted the same way: the amount of work, how we reach it and what it needs, along with when we can work on site. Call for a quick quote and we will explain what it covers.
Why book with us
- Over 20 years’ experience
- 12-month guarantee on every job
- Anti-fungal sanitary silicone in wet areas
- 4.9 on Google from 180+ five-star reviews
Take a look at how sealant jobs are priced and our reviews.
How the visit works
There is not much for you to do on the day. Point us to the joints and we’ll get on with it. The work itself takes anything from a few hours to a full day, depending on how many windows, including the tidy-up. In a London area like Blendon, the main things to plan are parking and access: let us know about parking, the floor we’ll be working on and any lift or shared entrance.
- Each surround is checked first.
- The joint is raked out and cleaned.
- Large voids are packed out.
- New sand mastic is applied and shaped by hand.
- We finish the mastic to a tidy line.
Preparing for the visit
- Let us know about parking restrictions
- Clear the area around the work
- Let us know if you’ve seen damp or leaks
Getting a quote
Every job is quoted individually. Just call 0345 464 0079 or email us with the details and send pictures if you have them.
Advice
DIY versus a professional finish
If you’ve already had a go yourself, that is fine. We cut it out and start again, so just mention it when you contact us.
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.