Greater London · England
Sand mastic for sash & case windows in Plaistow, Greater London
We cover Plaistow for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly and a 12-month guarantee.
- Silicone on a period window that looks wrong
- Mastic that needs renewing before redecorating
- Mastic dropping out of the joint
DIY sealant or a professional job?
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
Sand mastic in Plaistow
On many period windows, sand mastic looks right and suits the building. Newer frames normally get a flexible sealant instead and we will explain which is best for yours. Common call-outs are for patchy fillers round a sash window and draughty sash windows at the surround, on brick reveals, timber door frames and tenement windows.
London has a lot of flats and conversions, where windows are often on upper floors. In a converted house or block, the lease normally says who is responsible for the windows, so it’s worth checking before booking, and access in Plaistow is something to talk through when you book.
Whatever the size of the job, it’s backed by our one-year guarantee.
- Where
- Plaistow (BR1, BR2, BR3)
- Region
- Greater London
- Cover
- 12 months on all our work
- Price
- A clear price before work begins
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Places near Plaistow
Also in Plaistow
When it is not the sealant
In fairness, there are a few things sealant will not fix:
- Putty and glazing repairs
- Whether work needs listed building consent
- Sashes that need overhauling
Not sure which it is? You can call 0345 464 0079 or drop us an email and we will tell you honestly before booking.
Where we work in Plaistow
- Timber door frames
- Period & listed homes
- Tenement windows
- Stone surrounds
- Brick reveals
- Sash and case windows
Plaistow homes and the weather
With historic houses such as Bromley Palace (about 1.2 miles south-east) nearby, there’s older building stock in the area around Plaistow as well as newer homes. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window. 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.
Letting a property close to Sundridge Park station? Then older sash windows in a rental need their mastic kept sound to keep the weather out. For an older house near a landmark such as St Mary’s Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Plaistow is about 1 mile north of Bromley, in Greater London. From the centre of Plaistow to the outskirts, sand mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Our Greater London coverage runs to 764 places, and Plaistow is one of them. London is on our list too, around 7 miles away.
Every address in BR1, BR2 and BR3 is within our area for sand mastic, from the main roads to the quietest streets. Whether your property is on Saxon Road, Arcus Road and Croft Road or anywhere close by, we can help. Close by, we work in Downham (1 mile north), Sundridge (1 mile east), Grove Park (1 mile north-east), Bromley (1 mile south) and Chinbrook (1 mile north-east). Further out, we also cover London (7 miles north-west), City of Westminster (10 miles north-west), Marylebone (10 miles north-west), Kensington (11 miles north-west), St Pancras (9 miles north-west) and Shoreditch (8 miles north-west).
What’s near Plaistow
Locally, jobs take us to homes and businesses close to Holy Trinity College Bromley, The Railway Tavern and Haberdashers' Aske's Knights Academy, among other places. Plaistow’s nearest station is Sundridge Park station, roughly 0.6 miles south-east of the centre. Well-known places in the area include Greenwich Castle (4.1 miles north) and Prefab Museum (1.3 miles north-west). Not far away are Downham Woodland Walk and Summer Hill.
Plaistow: your questions answered
Can parking be tricky for a visit in Plaistow?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. That way the visit can be planned around it.
Do you work for landlords with property near Sundridge Park station?
Yes, landlords and agents are among the people we work for. Just phone 0345 464 0079 or send us an email with the address and what needs doing, and we’ll send you a clear quote.
Do I need to be at home?
That depends on where the joints are. For work indoors, someone needs to let us in, while outside work can sometimes be arranged differently.
Is it possible to take out silicone and use sand mastic instead?
Yes. The silicone is cut out and the joint cleaned before the sand mastic goes in.
Do the sealants smell?
There can be a smell while the sealant cures, but it fades. Ventilation helps.
Is it worth trying it myself?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. We can always put it right if it fails.
Should I use sand mastic or silicone?
That depends on your windows. Period windows in stone or brick usually suit sand mastic and newer frames generally get a flexible sealant.
Do you work in Plaistow?
Yes, we do. Plaistow is part of the area we cover.
Different surfaces, different methods
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.
Tenement and terrace windows
In shared buildings, the windows may be part of a wider repair so it’s worth checking responsibilities.
Looking after it afterwards
A little care helps the new joints last. Our advice:
- Take care around the mastic when scraping paint
- Renew mastic before redecorating the windows
- Ask a joiner to look at soft timber first
- Check with your local planning authority if your home is listed
Leave the new mastic unpainted, as traditional guidance advises. Ask us before any decorating around it.
Good mastic helps keep the frame dry. Once it fails, water can sit against the timber, which can lead to rot.
How we quote for sand mastic
We quote each job individually. These are the things that affect it:
- Mould in or behind the old joints
- The amount of work
- When we can work, for business premises
- How many rooms, windows or areas are involved
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
What to tell us for a quote
When you contact us, these details help:
- What the problem is, such as mould, gaps, leaks or cracking
- The rough size of the job
- Whether it has been sealed before
- A few pictures by email, if you can
We don’t publish a price list. Instead, your job gets its own clear quote. To get started, phone 0345 464 0079 or send us an email.
What we are called out for in Plaistow
Scraping and sanding before painting can loosen old mastic. Many people find it crumbling when they prepare the windows, which is a good time to renew it.
Look out for any of the following:
- Old sand mastic that has cracked, crumbled or fallen out
- Mastic worn away on windows facing the weather
- Gaps where the frame meets the masonry
- Draughts and rain around sash boxes
Schools such as Burnt Ash Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
Questions to ask before you book
- How the joint is cleaned and prepared
- Who turns up on the day
- How hidden problems are handled
- Whether the sealant suits the joint
What happens on the day
There is not much for you to do on the day. Show us the job and we will take it from there. The work itself takes a few hours per window, depending on the condition of the joints. In Plaistow, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- Large voids are packed out.
- New sand mastic is applied and shaped by hand.
- We finish the mastic to a tidy line.
How to prepare
- Mention any tricky access
- Let us know about parking restrictions
- Tell us about any previous sealing or DIY attempts
Get a quote
Asking for a quote is easy: let us know the job and the location, and roughly how big it is. A few pictures by email make the job easier to understand.