Hertfordshire · England
Sand Mastic in Hunsdon
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for Hunsdon, backed by a one-year guarantee. Ask us for a quote.
- Draughts and rain around sash boxes
- Gaps round a timber door in stone or brick
- Mastic dropping out of the joint
Aftercare tips
Aftercare is simple, and it makes a real difference:
- Keep sills and gutters clear so water drains away
- Go gently near the mastic when preparing windows
- Ask us before painting near the mastic
- Find out about consent before window work on a listed home
Keep gutters and sills clear so water runs away from the surround. Constant wetting wears the mastic faster.
Crumbling mastic lets rain into the joint. That water can reach the timber frame and the wall so early renewal protects both.
Sand mastic in Hunsdon, done properly
Sand mastic suits most period window surrounds. On modern frames we’d normally use a flexible sealant and we’ll explain which is best for yours. Typical jobs include wind and rain getting in round a sash window and open joints round the window box, on stone surrounds, period & listed homes and brick reveals.
In a village or hamlet like Hunsdon, older cottages and farmhouses often have timber windows set in stone or brick. Not every older frame suits a modern silicone bead, and sometimes a traditional sand mastic is the better choice.
Our work is backed for twelve months, in Hunsdon and everywhere else we cover.
- Location
- Hunsdon (SG12)
- Wider area
- Hertfordshire
- Cover
- One year on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Towns and villages near Hunsdon
Also in Hunsdon
Sand mastic in Hunsdon: local notes
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. With historic houses such as Much Hadham Palace (about 3.6 miles north) nearby, there’s older building stock in the area around Hunsdon as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
If you live in an older home near St Francis Chapel, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. If you look after a building such as Hunsdon Junior Mixed and Infant School, its window and door frames need their mastic kept sound, just like a home’s. If you let a flat or house near Roydon station, any sash windows need sound mastic to keep draughts and rain out.
Hunsdon is about 4 miles north-west of Harlow, in Hertfordshire. Hunsdon gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. 381 places in Hertfordshire are on our list. You can also see our page for Chelmsford, roughly 19 miles from Hunsdon.
Every address in SG12 is covered for sand mastic, from the main roads to the quietest streets. If you need sand mastic at a property on High Street, Cunningham Grove and Wicklands Road or anywhere close by, we can help. Neighbouring places we cover for sand mastic include Hunsdonbury (1 mile south), Widford (1 mile north), Nether Street (1 mile north), Wareside (2 miles north-west) and Babbs Green (2 miles north-west). Within a short drive, we also cover Stevenage (12 miles north-west), Bishop's Stortford (6 miles north-east), Welwyn Garden City (11 miles west), Hoddesdon (5 miles south-west), Cheshunt (8 miles south-west) and Hatfield (13 miles west).
What’s near Hunsdon
Around Hunsdon, our work takes us to homes and buildings near The Crown pub and the streets around them. For rail, the closest station is Roydon station, about 2.4 miles south of the centre. Other landmarks nearby include Harlow Mill (3.3 miles east) and Henry Moore Studios and Gardens (2.4 miles north-east). Open spaces near Hunsdon include Hunsdon Mead.
Questions from Hunsdon
Can you do sand mastic in Hunsdon?
Yes, Hunsdon is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or send us an email with a few details of the job.
Can you help a landlord with a rental near Roydon station?
Yes, we work for letting agents and landlords. You can ring 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before any work starts.
Are you ARBOMaster approved?
Yes. We hold ARBOMaster approved applicator status.
Is it possible to take out silicone and use sand mastic instead?
In most cases. The silicone is cut out and the joint cleaned, then point it with sand mastic.
How long does sand mastic take?
That depends on how much there is to do, but most jobs take a few hours for a single window, longer for several. We’ll tell you when we quote.
Can I choose the sealant colour?
Most of the time, yes. We’ll explain which colours are available.
Are you fully insured?
Yes, we are fully insured for domestic and commercial work.
Can I do it myself?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
What affects the cost of sand mastic
Your quote is based on your job. We take into account:
- Any mould that needs treating
- How much old sealant there is and how hard it is to remove
- Whether the work is at height
- The type of sealant required
No two jobs are quite the same, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all play a part.
What we need to know
When you contact us, these details help:
- What’s wrong with the joints now
- If someone has resealed it before
- How we’d reach the joints
- The address or postcode of the job
Every job is quoted individually, so start by telling us what you need. Simply ring 0345 464 0079 or email us and describe the job, and photos are welcome.
Honest limits
We will not take on work that will not last, so these are the limits:
- Putty and glazing repairs
- Crumbling stone or brickwork round the window
- Sashes that need overhauling
If you are not sure, just call 0345 464 0079 or drop us an email and we will give you a straight answer.
Surfaces we seal
- Tenement windows
- Stone surrounds
- Period & listed homes
- Sash and case windows
- Brick reveals
- Timber door frames
What happens if it’s left?
Silicone might seem the quicker option, but on period stone or brick it often looks out of place. Sand mastic is the traditional material and finishes neatly against the masonry. Where a wall is exposed, as many are in small places like Hunsdon, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, any mould to treat, and whether the work is at height. Your quote takes all of that into account.
Why choose Mr Mastic in Hunsdon
- A 12-month guarantee on all work
- Homes, businesses and hotels
- We never seal over old sealant
- Arbo and Everbuild products
Take a look at our cost guide or what customers say.
Can I do it myself?
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
If you’ve already had a go yourself, that’s fine. We cut it out and start again, so just mention it when you contact us.
How the job changes by surface
Stone surrounds
Stone openings are rarely perfectly straight, so the gap isn’t the same all the way round. Sand mastic is shaped by hand to suit.
Period and listed homes
Period homes look their best with traditional materials.
How the visit works
When we arrive, we start by going over the job with you, so there are no surprises. Surfaces next to the work are protected before any work begins. The work usually takes anything from a few hours to a full day, depending on how many windows. Somewhere as small as Hunsdon, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- Each surround is checked first.
- We rake out the old mastic and clean the joint.
- We fill deep gaps so the new mastic is not too thick.
- New sand mastic is applied and shaped by hand.
- We finish the mastic to a tidy line.
Getting ready for the visit
- Tell us if parking is tricky
- Where the joints are inside, avoid wetting them before we arrive
- Tell us about any previous sealing or DIY attempts
Get a quote
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and email pictures if that’s easy.