Greater London · England
Sand mastic for sash & case windows in Bow, Greater London
Window and door surrounds in Bow need attention? We remove the old material, prepare the joints and seal them properly.
- Weathered mastic on the most exposed windows
- Crumbling sand mastic round a window
- Mastic round period door frames that has failed
Do you need sand mastic in Bow?
Age is the main cause. Even well-laid mastic needs renewing in time, depending on exposure and upkeep.
The most common problems we see are:
- Cement or filler used on old window joints that has cracked
- Failed mastic on an exposed elevation
- Mastic that needs renewing before redecorating
- Cracked mastic round a front door frame
Bow is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Comparing quotes
- How the colour is chosen
- How hidden problems are handled
- The length of the guarantee
- How the surfaces are prepared before sealing
Sand mastic in Bow, done properly
Sand mastic suits most period window surrounds. On modern frames we’d normally use a flexible sealant, and we’ll talk through which suits your home. If you have mastic dropping out of the joint and silicone on a period window that looks wrong, we can put it right, on timber door frames, stone surrounds and period & listed homes alike.
From mansion-block windows to modern glazing in new flats, London has every kind of frame. Over the years, the sealant around them shrinks, cracks and pulls away, letting in draughts and water.
Each job carries a 12-month guarantee.
- Where
- Bow (E3)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
The process
On the day, there’s very little for you to do. Point us to the joints and we will 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 Bow, as in most of London, parking needs a little planning. It helps if you can point us to a visitor permit or a bay close to the door.
- We look at the surrounds with you and agree the joints to renew.
- Old mastic and any loose material are raked out.
- Deep gaps are packed so the mastic sits at the right depth.
- The sand mastic is mixed and pressed into the joint by hand.
- The surface is finished to suit the stone or brick.
How to prepare
- Let us know about stairs, lifts or work at height
- Let us know if you’ve seen damp or leaks
- Where the joints are inside, avoid wetting them before we arrive
Getting a quote
If you are in Bow and need sand mastic, phone 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and we’ll agree the price before any work begins.
Related advice
Sand mastic in Bow: local notes
Historic houses like Sutton House (about 1.6 miles north-west) are a reminder that the area around Bow has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
If you live in an older home near St Paul Old Ford, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. If you let a flat or house near Hackney Wick station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Bow is about 1 mile south-east of Hackney, in Greater London. Bow gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Bow is one of 764 towns and villages in Greater London where we work for sand mastic.
All of E3 is within our area for sand mastic, from the main roads to the quietest streets. We cover properties on Trellis Square, Sheffield Square and Bromley High Street and the roads around them. With the B142 close by, Bow is simple for us to get to for sand mastic. Neighbouring places we cover for sand mastic include Donnybrook Quarter (1 mile north), Old Ford (1 mile north-east), Mile End (1 mile south), Fish Island (1 mile north) and Bromley (1 mile south-east). Within a short drive, we also cover London (4 miles south-west), City of Westminster (6 miles west), Marylebone (5 miles west), Kensington (8 miles west), St Pancras (4 miles west) and Walthamstow (4 miles north).
Around Bow
In Bow, that means homes and buildings near Lord Tredegar Public House, Grove Hall Park and Mulberry UTC. Bow’s nearest station is Hackney Wick station, about 0.9 miles north of the centre. Other landmarks nearby include V&A East (0.9 miles north-east) and St Clement's Hospital (within half a mile south). Green spaces nearby include Hollow Pond and Old Ford Island.
Nearby places to Bow
Also in Bow
What affects the quote in Bow
Every job gets its own quote. This is what makes a difference:
- Access and height
- The type of sealant required
- How much old sealant there is and how hard it is to remove
- When we can work, for business premises
What it costs depends on the size of the job, how hard the old material is to remove and access to the work. You will have a clear quote before any work starts.
Helping us quote
What to tell us when you ask for a quote:
- The problem you’ve noticed
- Whether it has been sealed before
- A few pictures by email, if you can
- Where the property is
We quote each job on its own, so the first step is telling us about yours. Simply phone 0345 464 0079 or email us and describe the job.
Aftercare tips
Good habits help new joints last longer. Our tips:
- Do not run silicone over sand mastic
- Inspect the joints round the windows every year or so
- Ask the planning authority about consent for listed or conservation-area homes
- Have rotten timber repaired before new mastic goes in
Don’t run silicone over the new mastic. If anything cracks, get it looked at rather than patching it.
Renewing mastic before redecorating saves doing it twice. Painting over failed mastic hides the problem for a while.
Landlords, agents and businesses in Bow
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. We can quote for more than one property at once.
We also work for property managers and facilities teams in Bow and across Greater London. We can quote a run of properties together.
Different surfaces, different methods
Brick reveals
Sand mastic is also used where timber frames meet brick. It gives a traditional finish.
Sash and case windows
Most of our sand mastic work is on sash windows. We renew the mastic round each box.
Can I do it myself?
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
Bow questions
Can you do sand mastic in Bow?
Yes. We work across London and the South East, and Bow is part of that. Just call 0345 464 0079 or send us an email with a few details of the job.
Is parking a problem for a job in Bow?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly.
When will the new mastic be hard?
It forms a skin fairly soon, then hardens over a longer period. The weather and joint depth both affect it.
How much does sand mastic cost in Bow?
We don’t publish prices, because the cost depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
Is the work guaranteed?
You get our one-year guarantee on every job.
Can you replace silicone on a period window with sand mastic?
In most cases. We remove the silicone and clean the joint, then point it with sand mastic.
Do you have insurance?
Yes. We’re fully insured.
Do you offer different sealant colours?
We help you choose a colour that suits, from white and clear to greys and other shades. The product needed can limit the range.