Surrey · England
Sand mastic for sash & case windows in West Bedfont, Surrey
Our applicators work in West Bedfont on traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old material cut out, joints cleaned and sealed neatly.
- Crumbling sand mastic round a window
- Gaps where the frame meets the masonry
- Failed mastic on an exposed elevation
Sand mastic in West Bedfont
Across West Bedfont, we renew sand mastic around sash and case windows. Each joint is raked out, prepared and pointed by hand for a neat, traditional finish. We work on tenement windows, brick reveals and timber door frames, and people most often call us about draughty sash windows at the surround and gaps between timber frames and stone or brick.
Outdoor sealant needs dry, clean surfaces, so work on frames around West Bedfont is planned for dry weather. Tell us about access to every side of the house, including upper-floor windows.
We guarantee the work for a year. If something isn’t right with it in that time, tell us and we will put it right.
- Place
- West Bedfont (TW19, TW6)
- Wider area
- Surrey
- Guarantee
- 12 months on all our work
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Can I do it myself?
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.
How we quote for sand mastic
You will get a clear quote before any work starts. It takes into account:
- Mould in or behind the old joints
- Whether the work is at height
- How much old sealant there is and how hard it is to remove
- The amount of work
The cost reflects the work involved, not a rough estimate. That is why we ask about the job first and give you a clear quote before any work starts.
Asking for a quote
You do not need to know the technical terms. It helps if you can tell us:
- Photos by email, if that is easy
- The address or postcode of the job
- If someone has resealed it before
- Access, such as stairs, a lift or height
For a quick quote, get us on the phone, or send an email if you’d rather. Tell us about the joints that need doing and we’ll talk you through the work.
How the visit works
All our tools and materials come with us in the van. Once we have agreed what’s being done, we protect the area and start. It normally takes a few hours for a single window, longer for several. In a small place like West Bedfont, access is normally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- 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.
Before we arrive
- Tell us about any previous sealing or DIY attempts
- Mention any leaks or damp you’ve noticed
- Clear the area around the work
Get a quote
For sand mastic in West Bedfont, call 0345 464 0079 or drop us an email. Tell us what the problem is and where, and we will agree the price before any work begins.
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West Bedfont: your questions answered
I let a flat near Heathrow Terminal 4 Rail station. Can you help?
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.
Is West Bedfont in your area for sand mastic?
Yes. We work across London and the South East, and West Bedfont is part of that. Just call 0345 464 0079 or email us with a few details of the job.
Can I do it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Does someone need to be in?
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 is Mr Mastic based?
Mr Mastic is based in Crawley. We cover West Bedfont and the rest of Surrey, along with the rest of our area.
Can I paint the new mastic?
It’s traditionally left unpainted, which is what traditional guidance recommends. Ask us before decorating.
What does sand mastic cost?
We do not publish prices, because the cost depends on the job: how much there is, what’s there now, how we reach it and what it needs. You’ll get a clear quote before work begins.
How long does sand mastic take to harden?
It forms a skin fairly soon, then hardens over a longer period. The weather and joint depth both affect it.
Do you need sand mastic in West Bedfont?
Previous repairs in cement or silicone often trap water or crack away. They do not suit the joint and we normally remove them.
Signs it’s time to call us include:
- A silicone bead on a sash window that spoils the look
- Wind and rain getting in round a sash window
- Patchy fillers round a sash window
- Crumbling sand mastic round a window
Letting a property close to Heathrow Terminal 4 Rail station? Then older sash windows in a rental need their mastic kept sound to keep the weather out.
Comparing quotes
- How long to leave it before use
- What guarantee comes with the work
- Which colour the sealant will be
- Who turns up on the day
What the job involves on each surface
Timber door frames
Door frames get knocked and soaked, so their mastic can fail sooner. We rake it out and renew it.
Brick reveals
We rake out the old mastic and pack deep voids before pointing.
Also in West Bedfont
Landlord and commercial work in West Bedfont
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together.
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we will quote.
When something else is needed
We won’t take on work that won’t last, so here’s what sealant can’t put right:
- Broken panes
- Crumbling stone or brickwork round the window
- Decayed frames that need repair
Not sure which it is? You can call 0345 464 0079 or email us and we will tell you honestly before you book.
Joints and surfaces we work on
- Period & listed homes
- Timber door frames
- Sash and case windows
- Stone surrounds
- Brick reveals
- Tenement windows
West Bedfont homes and the weather
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.
For site and facilities teams at buildings such as Stanwell Fields CofE Primary School, larger buildings have plenty of frames, and the mastic around each one ages. In the older streets around Church of St Mary, the joint between an old wall and a newer frame is normally the first place rain gets in.
West Bedfont is about 1 mile north of Ashford, in Surrey. West Bedfont gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a 12-month guarantee. Across Surrey, we cover 395 places, and West Bedfont is one of them. For nearby work, see our London page (16 miles or so).
Work in TW19 and TW6 works the same way as everywhere else we cover. That includes homes and businesses on Short Lane, The Nightingales and Long Lane. We also cover Stanwell (1 mile west), Bedfont (1 mile east), Heathrow (1 mile north-east), Ashford (1 mile south) and Ashford Common (2 miles south-east). Within a short drive, we also cover Guildford (15 miles south), Woking (10 miles south-west), Camberley (14 miles south-west), Epsom (12 miles south-east), Ewell (11 miles south-east) and Egham (4 miles south-west).
Landmarks near West Bedfont
In West Bedfont, that means homes and buildings near Spelthorne College, Thomas Knyvett College and The Swan Public House. The nearest railway station is Heathrow Terminal 4 Rail station, roughly 1 mile north-east. Other landmarks nearby include Spelthorne Museum (2.5 miles south-west) and Ashford Hospital (0.7 miles south). Not far away are Staines Reservoirs and Crane Meadows.