Greater London · England
Sand Mastic in Hackney
Problem with your window and door surrounds in Hackney? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Modern sealant on a period surround
- Open joints round the window box
- Mastic that needs renewing before redecorating
DIY sealant or a professional job?
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
Sand mastic in Hackney
Our applicators renew the sand mastic around sash and case windows and doors in stone and brick. The old mastic is raked out, the joint is prepared and new mastic is shaped by hand. If you are dealing with cracked mastic round a front door frame and weathered mastic on the most exposed windows, we can help, whatever the surface.
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, in Hackney as anywhere.
There’s a 12-month guarantee on every job, large or small.
- Where
- Hackney (E9, E8, E3, E5)
- Region
- Greater London
- Cover
- One year on every job
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Hackney questions
Can you do sand mastic in Hackney?
Yes, Hackney is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or send us an email and let us know what needs doing, and we will give you a clear quote.
Is parking a problem for a job in Hackney?
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.
Is it possible to paint over sand mastic?
Traditional guidance is not to paint over sand mastic. If you’re redecorating the window, ask us first and we will talk you through it.
Should I try DIY first?
That depends on the joint. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional, while a short indoor joint may be within reach.
How much does sand mastic cost in Hackney?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
How long does sand mastic take to go off?
The surface skins quite quickly and it hardens fully over a longer time. Timing depends on the weather and the joint.
Where do you work from?
We are a Crawley-based firm, with over 20 years’ experience. Our area covers South East England, London and Scotland.
What do you put in the joint?
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.
How it works
All our tools and materials come with us in the van, so there’s nothing for you to buy. After a quick look at the joints together, the area is protected and the work begins. It normally takes anything from a few hours to a full day, depending on how many windows. In Hackney, 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 the window surrounds and agree which joints need renewing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Deep voids are packed so the mastic is the right thickness.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- We dress the surface so it sits neatly against the masonry.
Getting ready for the visit
- For indoor joints, keep the area dry beforehand if you can
- Let us know about earlier repairs to the joints
- Mention any leaks or damp you’ve noticed
Get a quote
To get a quote, ring 0345 464 0079 or email us and tell us where the job is and what the problem looks like. You will have a clear quote before any work starts.
Advice
Frames and glazing around Hackney
In London conversions and blocks, the lease decides who is responsible for the frames, so check that before booking. London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Schools such as Berger Primary School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s. Letting a property close to Homerton station? Then older sash windows in a rental need their mastic kept sound to keep the weather out.
Hackney is about 4 miles north-east of London, in Greater London. Across the E9 area, our applicators can take on sand mastic. Our Greater London coverage runs to 764 places, Hackney among them.
All of E9, E8, E3 and E5 is within our area for sand mastic, from the main roads to the quietest streets. Whether your property is on Homerton High Street, Primrose Square and St John's Church Road or anywhere close by, our applicators can take on the job. Hackney is on the A107 and B113, which makes it straightforward to reach with everything needed for sand mastic. We also cover Homerton (1 mile north), Lower Clapton (1 mile north), Hackney Central (1 mile west), London Fields (1 mile south-west) and Cambridge Heath (1 mile south-west). Larger places within reach include London (4 miles south-west), City of Westminster (5 miles south-west), Marylebone (5 miles south-west), Kensington (7 miles south-west), St Pancras (3 miles west) and Walthamstow (3 miles north).
Near you in Hackney
We work in homes and buildings around The Urswick School, Clapton Park and Chesham Arms. There’s a railway station in Hackney itself: Homerton station. Well-known places in the area include Hackney Walk (under half a mile north-west) and Cell Project Space (0.9 miles south-west). Open spaces near Hackney include Tower Hill and Old Ford Island.
Different surfaces, different methods
Sash and case windows
On a sash window, the mastic joint shows on the outside, so a neat, even finish matters.
Timber door frames
Doors face weather and wear and the mastic can crack early. It’s renewed by hand.
Why deal with it now?
Before painting the windows, it pays to renew the mastic. Paint over cracked mastic won’t stop the gaps, and the new mastic is traditionally left unpainted. 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 Hackney, the repair is bigger than the sealant job would have been.
Homes and businesses are quoted the same way: the amount of work, the access and the products needed. Call for a quick quote and we’ll go through it with you.
Why book with us
- We never seal over old sealant
- Quality sealants from Arbo and Everbuild
- Every job guaranteed for a year
- An ARBOMaster approved applicator
Read how sealant jobs are priced or our reviews.
Landlords, agents and businesses in Hackney
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
We also work for property managers and facilities teams in Hackney and across Greater London. Several sites can go on one quote.
Signs you need sand mastic in Hackney
Timber frames move with the seasons. The movement cracks the mastic little by little.
Common reasons people contact us include:
- Tired mastic found when preparing windows for paint
- Failed mastic on an exposed elevation
- Cracked mastic round a front door frame
- Gaps where the frame meets the masonry
As a London address, Hackney can be tricky for parking: let us know about parking bays, permits or a driveway.
What to look for in a quote
- Which sealant they’ll use, and why
- What happens if the job turns out different
- Whether you can choose the colour
- How the surfaces are prepared before sealing
When it isn’t the sealant
We’d rather tell you now than do work that will not last, so here’s what sealant cannot put right:
- Broken panes
- Rotten sashes, sills or window boxes (a joiner’s job)
- Planning or listed building consent (your local planning authority decides)
If you are not sure, just ring 0345 464 0079 or send us an email and we’ll give you a straight answer before you book.
Joints and surfaces we work on
- Timber door frames
- Period & listed homes
- Tenement windows
- Brick reveals
- Sash and case windows
- Stone surrounds