Hertfordshire · England
Sand mastic for sash & case windows in Hitchin, Hertfordshire
Our applicators work in Hitchin on traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly and a one-year guarantee.
- Silicone on a period window that looks wrong
- Failed mastic on an exposed elevation
- Gaps between timber frames and stone or brick
Sand mastic in Hitchin
For a listed home or one in a conservation area, ask your local planning authority whether consent is needed for work to windows. Sand mastic is often favoured as a like-for-like material. If you’re dealing with weathered mastic on the most exposed windows and mastic dropping out of the joint, we can help, on timber door frames, stone surrounds and brick reveals alike.
In a town like Hitchin, older houses sit alongside newer estates, with windows of every age. All of them depend on a sound bead of mastic between frame and wall.
All of our work is guaranteed for twelve months.
- Location
- Hitchin (SG4, SG5)
- Region
- Hertfordshire
- Guarantee
- A year, on every job
- Quotes
- A clear price before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Questions from Hitchin
Can you help a landlord with a rental near Hitchin station?
Yes, we work for landlords and agents. Just ring 0345 464 0079 or drop us an email and tell us about the property, and we will give you a clear price.
Is sand mastic in Hitchin guaranteed?
Every job comes with our 12-month guarantee, wherever it is. We are fully insured, and an ARBOMaster approved applicator.
Where do you work from?
Our base is Crawley, with over 20 years’ experience. We work across South East England, London and Scotland.
What does sand mastic cost?
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.
What’s sand mastic made of?
It’s sand mixed with a linseed-oil-based binder, used between timber frames and stone or brick.
What do you need from me for a quote?
Just the basics: where it is, what you’ve noticed and how we reach it. Then ring 0345 464 0079 or email us.
Do I need permission for sand mastic on a listed building?
Checking first is sensible. Your local planning authority can say if consent is needed for work on a listed home or in a conservation area.
Can I add another job to the visit?
Yes, and it often makes sense. Combining jobs makes good use of the visit, so mention them when you ask for a quote.
Different surfaces, different methods
Sash and case windows
Most of our sand mastic work is on sash windows. Each joint round the box is raked out and renewed.
Stone surrounds
Sand mastic sits naturally against stone. The finish blends with the masonry.
Aftercare tips
Aftercare is simple:
- Find out about consent before window work on a listed home
- Avoid heavy scraping on the mastic joint
- Clear gutters so water doesn’t pour onto the windows
- Do not paint over the new mastic
Avoid painting over the new mastic, which is the traditional advice. If you’re redecorating, ask us first.
Fine cracks show the mastic is starting to fail. It’s easier to renew it before it drops out.
Should I try it myself first?
If you are set on DIY, put the effort into 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.
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Frames and glazing around Hitchin
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.
For landlords with property near Hitchin station, any sash windows need sound mastic to keep draughts and rain out. In the older streets around Church of the Holy Saviour, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Hitchin is about 5 miles north-west of Stevenage, in Hertfordshire. Hitchin gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Our area takes in 381 places across Hertfordshire, from the larger towns to small villages. London is on our list too, about 32 miles from Hitchin.
All of SG4 and SG5 is within our area for sand mastic, from the main roads to the quietest streets. That includes homes and businesses on Market Place, London Road and Harrison Close. Hitchin is on the A505 and A600, which makes it straightforward to reach. Nearby, we also carry out sand mastic in Benslow (1 mile east), Poets Estate (1 mile east), Bearton (1 mile north-west), Walsworth (1 mile north-east) and Westmill (1 mile north-west). We also work in nearby towns such as Stevenage (5 miles south-east), St Albans (14 miles south), Welwyn Garden City (11 miles south), Harpenden (10 miles south), Hatfield (13 miles south) and Hertford (13 miles south-east). Hitchin is one of the larger places we cover in Hertfordshire.
Near you in Hitchin
Locally, jobs take us to homes and businesses close to Highbury Infant School and Nursery, Butts Close and Kingshott School, among other places. Other local landmarks include Radcliffe Arms (within half a mile north-east) and St Mary's Church (within half a mile south-west). There’s a railway station in Hitchin itself: Hitchin station. A little further out are Wymondley Castle (1.7 miles east) and Lister Hospital (3.1 miles south-east). Open spaces near Hitchin include Purwell Ninesprings and Markham's Hill.
What happens on the day
There isn’t much for you to do on the day. Show us the job and we’ll take it from there. The job generally takes a few hours for a single window, longer for several from start to finish. Parking in a town like Hitchin is normally straightforward, but tell us if there’s a driveway or any restrictions, and mention if the work is upstairs, in a flat or high on the outside.
- 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.
- Deep voids are packed so the mastic is the right thickness.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- We dress the surface so it sits neatly against the masonry.
Preparing for the visit
- Keep children and pets away from the work area
- Mention any sign-in or site rules at work premises
- Clear items away from the joints we’re working on
How to get a quote
Need a quote? Please call 0345 464 0079 or send us an email with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.
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For landlords and businesses
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
When something else is needed
New sealant cannot fix everything, and we’d rather say so up front. It won’t solve:
- Cracked or broken glass
- Decisions on consent for listed homes
- Decayed frames that need repair
Not sure which it is? You can call 0345 464 0079 or send us an email and we’ll tell you honestly.
Joints and surfaces we work on
- Sash and case windows
- Stone surrounds
- Timber door frames
- Period & listed homes
- Tenement windows
- Brick reveals
What we’re called out for in Hitchin
Over the years, sand mastic weathers. It dries out, cracks and loses its grip on the stone or timber.
Keep an eye out for these signs:
- Modern sealant on a period surround
- Old cement repairs round a window that have failed
- Mastic worn away on windows facing the weather
- Crumbling sand mastic round a window
Managing a site like Hitchin Girls' School? Then larger buildings have plenty of frames, and the mastic around each one ages.
Comparing quotes
- Is VAT in the price?
- How long to leave it before use
- Whether they’re fully insured
- What happens if they find a problem under the old sealant