Greater London · England
Sand mastic for sash & case windows in Hanworth, Greater London
We cover Hanworth for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Cracked mastic round a front door frame
- Open joints round the window box
- Window mastic to renew ahead of painting
Sand mastic in Hanworth
On many period windows, sand mastic looks right and suits the building. Newer frames generally get a flexible sealant instead, and we’ll talk through which suits your home. If you are dealing with old cement repairs round a window that have failed and mastic that needs renewing before redecorating, we can help.
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.
Whatever the size of the job, you get the same 12-month guarantee.
- Where
- Hanworth (TW13, TW12, TW2)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Sand mastic in Hanworth: local notes
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. In London conversions and blocks, the lease decides who is responsible for the frames, so check that before booking.
Homes close to St Richard's Church include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. As a London address, Hanworth can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Hanworth is about 6 miles south of Hayes, in Greater London. Across the TW13 area, our applicators can take on sand mastic. Across Greater London, we cover 764 places, Hanworth among them. You can also see our page for London, about 13 miles away.
We cover every part of the TW13, TW12 and TW2 postcode area for sand mastic. Local streets include Fir Road, New Road and Bel Lane. If you’re just outside Hanworth, we cover Hampton (1 mile south-east), Hampton Hill (1 mile east), Fulwell (1 mile east), Whitton (2 miles north-east) and West Molesey (2 miles south). Within a short drive, we also cover London (13 miles east), City of Westminster (11 miles north-east), Marylebone (12 miles north-east), Kensington (9 miles north-east), St Pancras (13 miles north-east) and Shoreditch (15 miles north-east).
Local landmarks in Hanworth
Around Hanworth, our work takes us to homes and buildings near Hampton School, Hampton Academy and Crane Park, among other places. For rail, the closest station is Hampton station, about 1.1 miles south of the centre. Other landmarks nearby include Teddington Memorial Hospital (1.8 miles east) and Kempton Steam Museum (1.1 miles west). Green spaces nearby include Garden Lake and Oak Avenue Local Nature Reserve.
What affects the cost of sand mastic
The quote reflects the job in front of us. We take into account:
- How much there is to do
- The number of rooms or windows
- Whether there’s mould to deal with
- The old material and how stubborn it is
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, along with when we can work on site. Ask us for a quote and we’ll explain what it covers.
Helping us quote
Before you ask for a quote, have a think about:
- Any previous sealing or DIY work
- A few photos by email, if you can
- What’s wrong with the joints now
- How we’d reach the joints
Every job is quoted individually, so start by telling us what you need. Simply call 0345 464 0079 or drop us an email and describe the job.
Landlords, agents and businesses in Hanworth
Landlords and letting agents in Hanworth can book us as well as householders. Sealant work between tenants is a simple way to keep a property in good order before the next move-in.
In hotels, rooms out of use cost money, so we plan the work room by room. Hotel work is part of what we do, alongside homes and businesses.
Honest limits
A few problems are outside what sealant work can do:
- Sashes that need overhauling
- Whether work needs listed building consent
- Crumbling stone or brickwork round the window
If you’re not sure, just phone 0345 464 0079 or email us and we’ll give you a straight answer before booking.
Joints and surfaces we work on
- Timber door frames
- Stone surrounds
- Brick reveals
- Period & listed homes
- Sash and case windows
- Tenement windows
Signs you need sand mastic in Hanworth
Sand mastic slowly weathers. It dries out, cracks and loses its grip on the stone or timber.
These are the problems we are asked about most:
- Tired mastic found when preparing windows for paint
- Draughts and rain around sash boxes
- Mastic dropping out of the joint
- Gaps where the frame meets the masonry
Schools such as Buckingham Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
Questions to ask before booking
- The length of the guarantee
- What insurance they hold
- Whether VAT is included
- What happens if they find a problem under the old sealant
Places near Hanworth
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What happens if it’s left?
Not every draught comes from the sashes themselves. Gaps between the frame and the wall can be just as bad, and renewing the mastic closes them. In a London flat, a failed joint rarely stays your problem alone: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
A failed joint rarely gets cheaper to fix by waiting, because water and mould keep working on it. If you are not sure whether it needs doing, ring 0345 464 0079 or drop us an email and we’ll give you an honest view and a quote.
Why us?
- Arbo and Everbuild products
- Anti-fungal silicone where joints get wet
- One-year guarantee on every job
- We never seal over old sealant
What happens on the day
Good joint work is mostly preparation, so that’s where we spend the time. Joints are cleaned back and dried before anything new goes in. In total, it usually takes anything from a few hours to a full day, depending on how many windows. In a London area like Hanworth, the main things to plan are parking and access: let us know about parking, the floor we will be working on and any lift or shared entrance.
- First, we look at the surrounds with you and agree what needs doing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- We pack any deep gaps so the mastic sits at the right depth.
- The mastic is mixed, pressed into the joint by hand and shaped.
- We dress the surface so it sits neatly against the masonry.
How to prepare
- Let us know if you’ve seen damp or leaks
- Clear the area around the work
- Keep pets and children clear of the area while we work
How to get a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is.
Read more
Questions from Hanworth
Do you cover Hanworth for sand mastic?
Yes. Our work covers London and the South East, and Hanworth is part of that. You can call 0345 464 0079 or drop us an email and tell us what needs doing, and we will give you a clear price.
Can you help a landlord with a rental near Hampton station?
Yes, rental work is part of what we do. You can ring 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before any work starts.
Will there be a smell?
It depends on the product. Some smell for a while, some hardly at all, and any smell fades as they cure.
Is sand mastic better than silicone for my windows?
For period timber windows in stone or brick, sand mastic is often the better fit. Modern frames normally suit a flexible sealant.
Do you take out the old sealant first?
Yes. We cut out all the old sealant and clean the joint.
Which products do you use?
Each joint gets the product that suits it. Movement, water and weather all affect the choice, and we’ll explain our choice.
How long does the job take?
Typically it takes anything from a few hours to a full day, depending on how many windows. Bigger jobs take longer, and we’ll tell you how long to expect.
Does someone need to be in?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
DIY sealant or a professional job?
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 doesn’t work out, we can still put it right.
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so just mention it when you contact us.