Hertfordshire · England
Sand mastic for sash & case windows in High Leigh, Hertfordshire
Problem with your window and door surrounds in High Leigh? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Tired mastic found when preparing windows for paint
- Draughts and rain around sash boxes
- A silicone bead on a sash window that spoils the look
How the visit works
Once we are on site, we check the joints match what you told us. If anything is different, we explain it before carrying on. After that, the work takes a few hours per window, depending on the condition of the joints. For a village or hamlet like High Leigh, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- Each surround is checked first.
- We rake out the old mastic and clean the joint.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- We finish the mastic to a tidy line.
How to prepare
- Let us know about parking restrictions
- Tell us about access, such as stairs, a lift or high-level joints
- Tell us about any previous sealing or DIY attempts
Ask for a quote
Need a quote? Please call 0345 464 0079 or drop us an email and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.
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About our sand mastic in High Leigh
Sand mastic suits most period window surrounds. On modern frames we’d normally use a flexible sealant, and we’ll talk through which suits your home. If you’re dealing with old sand mastic that has cracked, crumbled or fallen out and patchy fillers round a sash window, we can put it right.
Around High Leigh, many homes face open ground, so their windows and doors take the full weather. That exposure dries out and cracks the mastic around frames and sills faster.
Whatever the size of the job, you get the same 12-month guarantee.
- Place
- High Leigh (EN11)
- Wider area
- Hertfordshire
- Guarantee
- A year, on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Common questions in High Leigh
Can you help a landlord with a rental near Broxbourne station?
Yes, rental work is part of what we do. You can phone 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.
Do you cover smaller places like High Leigh?
Yes, High Leigh is covered. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
How much does sand mastic cost in High Leigh?
Every job is different, so each one gets its own quote. For a quick quote, phone 0345 464 0079 or drop us an email and let us know what needs doing and where.
Are you an approved applicator?
Yes. Mr Mastic is an ARBOMaster approved applicator, and we are fully insured.
Should I use sand mastic or silicone?
It depends on the window. Period windows in stone or brick generally suit sand mastic and newer frames usually get a flexible sealant.
Do you offer different sealant colours?
Most of the time, yes. We will tell you which colours the right product comes in.
Will there be a smell?
That depends on the sealant. Some smell for a while, some hardly at all, and any smell fades as they cure.
What exactly is sand mastic?
Sand mastic is a traditional material for pointing round windows and doors. It’s made with sand and a linseed-oil-based binder.
Quotes for sand mastic in High Leigh
Some jobs are bigger than they look, and some smaller. What affects the quote:
- The number and length of the joints
- Mould in or behind the old joints
- Whether the work is at height
- When we can work, for business premises
Every job is a little different, 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, it’s useful to know:
- The address or postcode of the job
- What’s wrong with the joints now
- How many joints, rooms or windows are involved
- The type of property
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and email photos if that’s easy.
Keeping the joints in good condition
Once the sealant has cured, a few habits help it last:
- Inspect the joints round the windows every year or so
- Do not run silicone over sand mastic
- Don’t paint over the new mastic
- Clear gutters so water does not pour onto the windows
Leave the new mastic unpainted, as traditional guidance advises. If you are redecorating, ask us first.
Once mastic starts to crumble, rain gets in. It can soak into the frame and the surrounding masonry, so renewing it early is worth it.
When something else is needed
Honest advice matters more to us than a booking, so here’s what new sealant will not do:
- Rotten sashes, sills or window boxes (a joiner’s job)
- Broken panes
- Decisions on consent for listed homes
If in doubt, phone 0345 464 0079 or email us and we’ll say what we think.
Joints and surfaces we work on
- Timber door frames
- Brick reveals
- Stone surrounds
- Period & listed homes
- Sash and case windows
- Tenement windows
What we are called out for in High Leigh
Shallow joints are a common cause. A thin layer does not hold well so we make sure the new mastic is the right thickness.
Look out for these signs:
- Mastic that needs renewing before redecorating
- Open joints round the window box
- Gaps round a timber door in stone or brick
- Mastic dropping out of the joint
Schools such as Westfield Community Primary School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s.
Before booking anyone
- When the joint can take water or movement
- Whether VAT is included
- How the colour is chosen
- Who does the work, and how experienced they are
Places near High Leigh
What else we do in High Leigh
Windows and doors in High Leigh
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Homes close to Church of St Catherine & St Paul include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. For landlords with property near Broxbourne station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
High Leigh is about 1 mile north-west of Hoddesdon, in Hertfordshire. From the centre of High Leigh to the outskirts, we cover sand mastic for every kind of property. High Leigh is one of 381 towns and villages in Hertfordshire we cover for sand mastic. London is on our list too, about 18 miles from High Leigh.
Here we cover the EN11 postcode area for sand mastic. If you need sand mastic at a property on Lord Street, Sedgwick Grove and Box Lane or anywhere close by, we can help. Neighbouring places we cover for sand mastic include Woollensbrook (1 mile north), Goose Green (1 mile west), Hoddesdon (1 mile south-east), Broxbourne (1 mile south) and Hailey (1 mile north). Larger places within reach include Stevenage (12 miles north-west), St Albans (13 miles west), Bishop's Stortford (11 miles north-east), Welwyn Garden City (8 miles west), Harpenden (14 miles west) and Cheshunt (4 miles south).
Near you in High Leigh
In High Leigh, that means homes and buildings near Barclay Park, King William IV Public House and Robert Barclay Academy, among other places. High Leigh’s nearest station is Broxbourne station, roughly 1.3 miles south-east. Well-known places in the area include Lowewood Museum (0.8 miles south-east) and Hertford County Hospital (3.5 miles north-west). The countryside around High Leigh includes Danemead and Cheshunt Lake.
Landlords, agents and businesses in High Leigh
We work for landlords and letting agents as well as householders. Sealant work between tenants keeps a property looking cared for.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Should I try it myself first?
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 fails, we can still redo it.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.