Hertfordshire · England
Sand mastic for sash & case windows in Wallington, Hertfordshire
Our applicators work in Wallington 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 and every job guaranteed for a year.
- Weathered mastic on the most exposed windows
- Tired mastic found when preparing windows for paint
- Wind and rain getting in round a sash window
How we handle sand mastic in Wallington
On many period windows, sand mastic looks right and suits the building. On modern frames we’d normally use a flexible sealant and we will explain which is best for yours. We are often asked to deal with crumbling sand mastic round a window and draughty sash windows at the surround, on brick reveals, sash and case windows and timber door frames.
Mastic can only go onto a dry, clean joint, so window work in Wallington is booked around the forecast. 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.
- Where
- Wallington (SG7)
- Wider area
- Hertfordshire
- Guarantee
- One year on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
What affects the quote in Wallington
Call for a quick quote. What matters most is:
- Any mould that needs treating
- Whether the work is at height
- How many areas need sealing
- How much there is to do
What it costs depends on the size of the job, how much old material has to come out and how easy the joints are to reach. You will have a clear quote before any work starts, so you know where you stand.
What we need to know
When you contact us, these details help:
- Any access issues, like height or stairs
- Pictures of the joints, sent by email
- Roughly how big the job is
- Whether it has been sealed before
Asking for a quote is easy: let us know the job and the location, and roughly how big it is. A few pictures by email make the job easier to understand, and we’ll take it from there.
Also near Wallington
Other services in Wallington
How it works
At the end, we look at the finished work together. The work normally takes a few hours for a single window, longer for several, depending on the amount of work. In a small place like Wallington, access is normally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- Each surround is checked first.
- The joint is raked out and cleaned.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
How to prepare
- Let us know about earlier repairs to the joints
- Tell us about any water getting in
- Tell us if parking is tricky
How to get a quote
To get a quote, ring 0345 464 0079 or email us with the location and a short description of the problem. You’ll have a clear quote before any work starts.
Advice
Signs you need sand mastic in Wallington
Decorating can disturb tired mastic. It’s often found when windows are being prepared for paint, which is a good time to renew it.
Keep an eye out for any of the following:
- Patchy fillers round a sash window
- Modern sealant on a period surround
- Tired mastic found when preparing windows for paint
- Mastic round period door frames that has failed
For landlords with property near Ashwell & Morden station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Before you book anyone
- What preparation is included
- Which sealant they’ll use, and why
- When the joint can take water or movement
- What insurance they hold
Wallington homes and the weather
With historic houses such as Hinxworth Place (about 4.9 miles north-west) nearby, there’s older building stock in the area around Wallington as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Homes close to Church of St Mary include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Wallington is about 5 miles east of Letchworth, in Hertfordshire. Anywhere in SG7, our applicators can take on sand mastic. Wallington is one of 381 places in Hertfordshire we cover for sand mastic. Our Chelmsford page covers work nearby (31 miles or so).
We work across SG7 for sand mastic. If you need sand mastic at a property on The Street and Kit's Lane or anywhere close by, our applicators can take on the job. If you’re just outside Wallington, we cover Clothall (2 miles south-west), Baldock (3 miles west), Weston (3 miles south-west), Walkern (5 miles south) and St Nicholas (5 miles south-west). We also work in nearby towns such as Stevenage (6 miles south-west), Bishop's Stortford (14 miles south-east), Welwyn Garden City (14 miles south), Harpenden (15 miles south-west), Hitchin (7 miles west) and Hertford (13 miles south).
Local landmarks in Wallington
The closest station to Wallington is Ashwell & Morden station, about 2.9 miles north of the centre. A little further out are Ashwell Village Museum (3.9 miles north-west) and Fairfield Hospital (5.6 miles west). Not far away are Hawkins Wood.
What sealant work can’t fix
Honest advice matters more to us than a booking, so here’s what sealant can’t fix:
- Masonry that needs repairing
- Sash cords, weights and draught-proofing of the sashes
- Whether work needs listed building consent
If you’re not sure, just ring 0345 464 0079 or send us an email and we’ll give you a straight answer before you book.
Joints and surfaces we work on
- Stone surrounds
- Timber door frames
- Brick reveals
- Sash and case windows
- Period & listed homes
- Tenement windows
Landlord and commercial work in Wallington
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a 12-month guarantee.
If you manage several properties in or around Wallington, jobs at different addresses can be quoted together. Send us the addresses and the work at each, and photos by email help.
How to look after the new joints
A little care helps the new joints last. Our advice:
- Don’t run silicone over sand mastic
- Plan mastic work ahead of painting
- Look over the window mastic once a year
- Avoid heavy scraping on the mastic joint
Make sure water drains away from the window surround. Constant wetting wears the mastic faster.
Sound mastic protects the frame. Failed mastic lets water reach the timber and timber that stays wet can rot.
Common questions in Wallington
Is Wallington in your area for sand mastic?
Yes. Our work covers London and the South East, and Wallington is part of that. Just call 0345 464 0079 or drop us an email with a few details of the job.
Do you cover smaller places like Wallington?
Yes, Wallington is covered. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Do you guarantee sand mastic work?
Every job comes with our one-year guarantee.
Are you ARBOMaster approved?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we are part of it.
I rent my home. Can I book you?
We can work for tenants, landlords or agents. Get your landlord’s agreement first.
Do I have to be there?
It depends on the job. Inside work needs someone to give us access, while outside work can sometimes be arranged differently.
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.
Can you work on commercial sites?
Yes. Commercial and hotel work is a large part of what we do. We can talk about working times when we quote.
Can I do it myself?
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.
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly, so tell us about it when you ask for a quote.