Greater London · England
Sand mastic for sash & case windows in Bounds Green, Greater London
Sand mastic for Bounds Green and the surrounding area: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Cracked mastic round a front door frame
- Old cement repairs round a window that have failed
- Draughts and rain around sash boxes
About our sand mastic in Bounds Green
Our applicators renew the sand mastic around sash and case windows and doors set in stone or brick. The old mastic is raked out, the joint is prepared and new mastic is shaped by hand. If you have failed mastic on an exposed elevation and open joints round the window box, we can help.
Much of London’s older housing was built with timber sash windows, some still in place and some long since replaced. Either way, the mastic between frame and brickwork is what stops draughts and rain getting in.
A one-year guarantee comes as standard, so you’re not left on your own once the job is done.
- Location
- Bounds Green (N22, N11, N13)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Keeping the joints in good condition
No joint lasts for ever, but care makes a real difference. Our tips:
- Find out about consent before window work on a listed home
- Look over the window mastic once a year
- Avoid heavy scraping on the mastic joint
- Sort the mastic before the decorators arrive
Look at the mastic when you look over the windows. Catching cracks early keeps repairs small.
Good mastic helps keep the frame dry. Once it fails, water can sit against the timber, which can lead to rot.
Leave it or put it right?
Filling over old, loose mastic does not last. Raking out and preparing the joint gives it a sound base so the new work lasts. In a London flat, a failed joint rarely stays your problem alone: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
Combining jobs into one visit is usually more efficient than separate visits, so it’s worth mentioning everything you’d like done. We will give you a clear price for the lot.
What you get with us
- Old sealant always removed completely
- Fully insured
- Domestic, commercial and hotel work
- 180+ five-star Google reviews
Take a look at what affects the cost or customer reviews.
What we are called out for in Bounds Green
Over the years, sand mastic weathers. It dries out, cracks and loses its grip on the stone or timber.
Common reasons people contact us are:
- Cracked mastic round a front door frame
- Mastic that needs renewing before redecorating
- Draughty sash windows at the surround
- Crumbling sand mastic round a window
Bounds Green is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Questions to ask before booking
- Whether the sealant suits the joint
- Whether VAT is included
- What happens if the job turns out different
- How long to leave it before use
When something else is needed
Some problems need a builder, plumber or other trade rather than us:
- Timber that has rotted
- Broken panes
- Sash cords, weights and draught-proofing of the sashes
If in doubt, phone 0345 464 0079 or send us an email and we will say what we think.
Joints and surfaces we work on
- Timber door frames
- Period & listed homes
- Stone surrounds
- Sash and case windows
- Tenement windows
- Brick reveals
FAQs for Bounds Green
Can you do sand mastic in Bounds Green?
Yes. We work across London and the South East, and Bounds Green is part of that. You can phone 0345 464 0079 or send us an email and tell us what needs doing.
Can parking be tricky for a visit in Bounds Green?
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.
What exactly is sand mastic?
It’s the traditional filler for the joint round timber windows and doors. It’s made with sand and a linseed-oil-based binder.
Are you an approved applicator?
Yes. We’re an ARBOMaster approved applicator.
Can new sealant go over the old?
No. Fresh sealant does not stick to old sealant, and it traps any mould or water underneath. It all has to come out first.
Will it make a mess?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.
Do you take out the old sealant first?
Yes. We cut out all the old sealant and clean the joint before applying anything new.
Where is Mr Mastic based?
We work from Crawley. Our applicators cover Bounds Green.
For landlords and businesses
If you manage several properties in or around Bounds Green, several properties can go on one quote. Send us the addresses and the work at each.
From a single let to a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Bounds Green homes and the weather
In London conversions and blocks, the lease decides who is responsible for the frames, so it’s worth checking before booking. Historic houses like Bruce Castle (about 2.2 miles east) are a reminder that the area around Bounds Green has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
In the older streets around St Barnabas Greek Orthodox Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. Managing a site like Bounds Green Infant School? Then its window and door frames need their mastic kept sound, just like a home’s.
Bounds Green is about 2 miles east of Finchley, in Greater London. We carry out sand mastic for householders, landlords and businesses in Bounds Green. We cover 764 towns and villages across Greater London, large and small. Our London page covers work nearby.
Jobs for sand mastic in N22, N11 and N13 works the same way as everywhere else we cover. We cover properties on Oak Lane, York Road and Park Road and the roads around them. Being close to the A109, Bounds Green is simple for us to get to. Neighbouring places we cover for sand mastic include Bowes Park (1 mile south-east), Arnos Grove (1 mile north), New Southgate (1 mile north-west), Oakthorpe Park (1 mile north-east) and Palmers Green (1 mile north-east). Larger places within reach include London (8 miles south), City of Westminster (6 miles south), Marylebone (6 miles south), Kensington (8 miles south-west), St Pancras (6 miles south) and Shoreditch (6 miles south).
Near you in Bounds Green
We work in homes and buildings around Ming-Ai, O. R. Tambo Recreation Ground and The Springfield pub. There’s a railway station in Bounds Green itself: Bowes Park station. Nearby you’ll also find Broomfield House Museum (0.8 miles north-east) and Greentrees Hospital (1.1 miles east). The countryside around Bounds Green includes Glebelands Local Nature Reserve and Darland's Lake.
Towns and villages near Bounds Green
Also in Bounds Green
The process
When we arrive, we look over the joints with you first, so you know exactly what we are doing. We protect the surfaces around the joints before any work begins. Most jobs take anything from a few hours to a full day, depending on how many windows. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Bounds Green. A visitor permit or a nearby bay makes the visit run more smoothly.
- We start by checking each surround and agreeing the joints to renew.
- Old, loose mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic isn’t too thick.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- The finish is dressed so it sits neatly against the stone or brick.
Preparing for the visit
- Keep children and pets away from the work area
- Mention if the joints have been sealed before
- On commercial sites, let us know about site rules
How to get a quote
Want a quote for sand mastic? Please phone 0345 464 0079 or send us an email and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.
Related advice
Quotes for sand mastic in Bounds Green
We do not publish a price list. The quote depends on:
- How many areas need sealing
- The size of the job
- Whether old sealant or filler has to be cut out
- Working hours on commercial sites
The cost depends on the size of the job, how much old material has to come out and how easy the joints are to reach. You will have a clear quote before any work starts, so you know where you stand.
Helping us quote
When you call or email, these details help:
- If someone has resealed it before
- Where the property is
- If it’s domestic, commercial or a hotel
- What the problem is, such as mould, gaps, leaks or cracking
Every job is quoted individually, so start by telling us what you need. Just ring 0345 464 0079 or email us with the details.