Surrey · England
Stanwell Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in Stanwell and across Surrey. Fully insured, ARBOMaster approved and guaranteed for a year.
- Draughty sash windows at the surround
- Mastic round period door frames that has failed
- Old sand mastic that has cracked, crumbled or fallen out
How we handle sand mastic in Stanwell
Sand mastic has long been used to fill the joint between timber frames and masonry. It’s a mix of sand and a linseed-oil-based binder, applied by hand. On period homes, it looks right where silicone wouldn’t. We work on sash and case windows, brick reveals and tenement windows, and common reasons people get in touch are a silicone bead on a sash window that spoils the look and wind and rain getting in round a sash window.
Homes around Stanwell range from older properties to newer houses, and their windows range just as widely. The right sealant depends on the frame and on what it sits in.
Whatever the size of the job, you get the same one-year guarantee in Stanwell and across Surrey.
- Location
- Stanwell (TW19)
- 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
FAQs for Stanwell
I let a flat near Ashford Surrey station. Can you help?
Yes, we work for landlords and agents. You can call 0345 464 0079 or email us with the address and a few details, and we’ll give you a fixed price before any work starts.
Do you cover Stanwell for sand mastic?
Yes. Our work covers London and the South East, and Stanwell is part of that. Just phone 0345 464 0079 or send us an email with a few details of the job, and we’ll give you a clear quote.
Do you remove the old sealant?
Always. Sealing over the old bead is the commonest cause of early failure, so we never do it.
Is it possible to take out silicone and use sand mastic instead?
Yes. We remove the silicone and clean the joint before the sand mastic goes in.
Do you do commercial work?
Yes. We can plan bigger jobs in stages to suit the site.
Do you hold any approvals?
Yes. Mr Mastic is an ARBOMaster approved applicator.
Can you do several jobs on one visit?
Yes, and it often makes sense. Combining jobs makes good use of the visit.
When will the new mastic be hard?
The surface skins quite quickly and it hardens fully over a longer time. The weather and joint depth both affect it.
DIY versus a professional finish
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
Signs you need sand mastic in Stanwell
Paint, silicone or cement used over old mastic causes problems. They don’t move with the timber and we normally remove them.
The most common problems we see are:
- Gaps round a timber door in stone or brick
- Patchy fillers round a sash window
- A silicone bead on a sash window that spoils the look
- Mastic that needs renewing before redecorating
If you let a flat or house near Ashford Surrey station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Questions to ask before you book
- What insurance they hold
- How the joint is cleaned and prepared
- Is VAT in the price?
- How long the guarantee is
The process
We bring everything the job needs with us, so you do not need to buy or prepare anything. Once we have agreed what’s being done, we protect the area and start. Most jobs take a few hours for a single window, longer for several. Parking around Stanwell is generally easier than in a town centre, but mention any lanes, gates or long drives. If the job is outside, tell us about side access and how high the joints are.
- We start by checking each surround and agreeing the joints to renew.
- 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.
- 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.
How to prepare
- For indoor joints, keep the area dry beforehand if you can
- Keep pets and children clear of the area while we work
- On commercial sites, let us know about site rules
How to get a quote
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we’ll explain how we’d tackle it. When it suits you, call 0345 464 0079 or email us.
Read more
How to look after the new joints
Aftercare is simple:
- Keep sills and gutters clear so water drains away
- Get any rot dealt with first
- Inspect the joints round the windows every year or so
- Don’t paint over the new mastic
When preparing windows for paint, take care around the mastic. It can be damaged by heavy scraping.
It’s best to renew mastic before painting the windows. Painting over failed mastic hides the problem for a while.
Windows and doors in Stanwell
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For an older house near a landmark such as Church of St Mary, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. If you look after a building such as Stanwell Fields CofE Primary School, the mastic around its windows and doors needs looking after like any other building’s.
Stanwell is about 2 miles north of Ashford, in Surrey. Wherever you are in the TW19 postcode area, we can carry out sand mastic at your property. 395 places in Surrey are on our list. We also work in London, about 17 miles from Stanwell.
Jobs for sand mastic in TW19 works the same way as everywhere else we cover. You will find streets such as High Street, Britannia Way and Frobisher Gardens, all of which we cover. Neighbouring places we cover for sand mastic include West Bedfont (1 mile east), Heathrow (1 mile north-east), Ashford (2 miles south), Bedfont (2 miles east) and Longford (2 miles north-west). We also work in nearby towns such as Guildford (15 miles south), Woking (10 miles south-west), Camberley (14 miles south-west), Epsom (12 miles south-east), Ewell (12 miles south-east) and Egham (3 miles south-west).
Near you in Stanwell
In Stanwell, that means homes and buildings near Spelthorne College, The Swan Public House and Thomas Knyvett College. The closest station to Stanwell is Ashford Surrey station, about 1.2 miles south. Nearby you’ll also find Ashford Hospital (0.9 miles south) and Spelthorne Museum (2.1 miles south-west). The countryside around Stanwell includes Staines Reservoirs and St Ann's Hill.
What affects the quote in Stanwell
Some jobs are bigger than they look, and some smaller. What affects the quote:
- The size of the job
- Whether there’s mould to deal with
- Which sealant suits the joint
- Working hours on commercial sites
There are no prices on our website, because each job is priced on what it involves. Call for a quick quote and we’ll talk you through it.
Helping us quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- Pictures of the joints, sent by email
- Access, such as stairs, a lift or height
- Where the job is, and your postcode
- The type of property
For sand mastic in Stanwell, call 0345 464 0079 or send us an email. Tell us what the problem is and where, and you will get a clear quote before we start.
Work for landlords, hotels and businesses
Mouldy or split sealant often shows up at the end of a tenancy. We can quote for more than one property at once.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
Surface by surface
Tenement and terrace windows
Tenements and terraces often have many sash windows with ageing mastic. We can do one window or several.
Period and listed homes
Many older homes were built with sand mastic round the windows. On listed buildings, check with your planning authority first.