Greater London · England
Sand mastic for sash & case windows in Hackbridge, Greater London
Our applicators work in Hackbridge on traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly.
- Mastic dropping out of the joint
- Cracked mastic round a front door frame
- Patchy fillers round a sash window
What happens on the day
The work is kept neat and contained to the joints we are treating, so you can get on with your day. The job usually takes a few hours for a single window, longer for several, and we tell you how long to leave it before we go. In a London area like Hackbridge, the main things to plan are parking and access: tell us about permits, visitor bays or off-street space, which floor we are working on and whether there’s a lift.
- We check the window surrounds and agree which joints need renewing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic is not too thick.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- The finish is dressed so it sits neatly against the stone or brick.
Getting ready for the visit
- Let us know about stairs, lifts or work at height
- Let us know about earlier repairs to the joints
- Clear items away from the joints we are working on
Ask for a quote
Need a quote? Please ring 0345 464 0079 or send us an email with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.
Related advice
About our sand mastic in Hackbridge
Sand mastic is the traditional way to point the gap between a timber window frame and the stone or brick around it. It’s made from sand and a linseed-oil-based binder, applied by hand. On older homes, it suits the building far better than silicone. We work on period & listed homes, sash and case windows and timber door frames, and people most often call us about open joints round the window box and a silicone bead on a sash window that spoils the look.
Much of London’s older housing was built with timber sash windows, some still in place and some long since replaced. Whatever is in the opening now, the joint between frame and wall is what keeps the weather out, in Hackbridge as anywhere.
All of our work is guaranteed for twelve months, and the guarantee is the same wherever you are.
- Place
- Hackbridge (CR4, SW16, SM4)
- Region
- Greater London
- Cover
- One year on every job
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
What affects the quote in Hackbridge
Jobs vary more than people expect. The main factors:
- How much old sealant there is and how hard it is to remove
- The number of rooms or windows
- Whether there’s mould to deal with
- Any working-time requirements on site
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
Helping us quote
To make quoting easier, please include:
- A few photos by email, if you can
- Any previous sealing or DIY work
- Where the job is, and your postcode
- The problem you’ve noticed
Call for a quick quote, or email us if that is easier. Describe what needs sealing and we will talk you through the work before giving you a price.
Work for landlords, hotels and businesses
In hotels, rooms out of use cost money, so the work can be planned room by room. We’ve worked in hotels as well as homes and businesses.
Failed sealant is one of the commonest items on a check-out report. Several properties can be quoted together.
Common questions in Hackbridge
Can parking be tricky for a visit in Hackbridge?
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 cover Hackbridge for sand mastic?
Yes, Hackbridge is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or send us an email with a few details of the job, and we will give you a clear price.
Do you take out the old sealant first?
Always. Sealing over the old bead is the commonest cause of early failure, and it’s something we never do.
Do I have to be there?
For indoor joints, yes, someone needs to let us in. Once we’ve agreed the job, you don’t need to watch us work.
Where do you work from?
We’re a Crawley-based firm, with over 20 years’ experience. We work across South East England, London and Scotland.
What sealant do you use?
Each joint gets the product that suits it. Movement, water and weather all affect the choice, and we will tell you what we’re using.
What is sand mastic?
Sand mastic is a traditional material for pointing round windows and doors. It combines sand with a linseed-oil-based binder.
I rent my home. Can I book you?
We can work for tenants, landlords or agents. Just make sure your landlord agrees.
What sealant work can’t fix
Some problems need a builder, plumber or other trade rather than us:
- Timber that has rotted
- Planning or listed building consent (your local planning authority decides)
- Damaged stone surrounds
Not sure which it is? You can phone 0345 464 0079 or email us and we’ll tell you honestly before booking.
Surfaces we seal
- Period & listed homes
- Tenement windows
- Timber door frames
- Stone surrounds
- Brick reveals
- Sash and case windows
Places near Hackbridge
Also in Hackbridge
When to call us in Hackbridge
Previous repairs in cement or silicone often trap water or crack away. They don’t move with the timber, and they generally need raking out.
The most common problems we see are:
- A silicone bead on a sash window that spoils the look
- Window mastic to renew ahead of painting
- Wind and rain getting in round a sash window
- Mastic round period door frames that has failed
If you look after a building such as St Thomas of Canterbury Catholic Primary School, the mastic around its windows and doors needs looking after like any other building’s.
What to look for in a quote
- Whether the sealant suits the joint
- How long the guarantee is
- How much experience the applicator has
- When the joint can take water or movement
How to look after the new joints
Good habits help new joints last longer. Our tips:
- Make sure water runs off the sill
- Check the mastic when you check the paintwork
- Sort the mastic before the decorators arrive
- Take care around the mastic when scraping paint
Keep paint scrapers and sanders off the mastic when redecorating. Hard scraping can loosen it.
Renewing mastic before redecorating saves doing it twice. Painting over failed mastic hides the problem for a while.
Hackbridge 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. Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
As a London address, Hackbridge can be tricky for parking: let us know about parking bays, permits or a driveway. If you live in an older home near St. Mark's Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Hackbridge is about 2 miles west of Thornton Heath, in Greater London. Homes, rented property, offices and hotels in Hackbridge is covered for sand mastic. Every job comes with our 12-month guarantee. Hackbridge is one of 764 places in Greater London where we work. Our London page covers work nearby, about 7 miles away.
Every address in CR4, SW16 and SM4 is within our area for sand mastic, from the main roads to the quietest streets. Whether your property is on Kings Road, Baker Lane and Manor Road or a nearby road, our applicators can take on the job. Close by, we work in Mitcham (1 mile north), Eastfields (1 mile north), Colliers Wood (1 mile north-west), Merton Abbey (2 miles north-west) and Furzedown (2 miles north). Larger places within reach include London (7 miles north), City of Westminster (8 miles north), Marylebone (8 miles north), Kensington (7 miles north), St Pancras (9 miles north) and Shoreditch (9 miles north).
Landmarks near Hackbridge
Around Hackbridge, our work takes us to homes and buildings near The White Lion of Mortimer pub, The Archbishop Lanfranc School and St Mark's Church of England Academy. For rail, the closest station is Mitcham Eastfields station, about 0.5 miles north of the centre. Nearby you will also find Wandle Industrial Museum (0.7 miles west) and Wilson Hospital (0.5 miles south-west). Green spaces nearby include Duppas Hill and Cranmer Green.
Why it’s worth doing now in Hackbridge
An open joint round the frame lets weather in. Left, water can reach the timber and the wall, so dealing with it now protects both. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in Hackbridge, the repair is bigger than a sealant job.
What you pay reflects the work, not guesswork. That’s why we ask about the job first and send you a clear quote before we start.
Why book with us
- We are fully insured
- Old sealant always removed completely
- Quality sealants from Arbo and Everbuild
- More than 20 years in sealant work