Hertfordshire · England
Sand Mastic in Burnham Green
Sand mastic for Burnham Green, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Modern sealant on a period surround
- Gaps where the frame meets the masonry
- Gaps round a timber door in stone or brick
About our sand mastic in Burnham Green
Sand mastic is the traditional way to point the gap between a timber window frame and the stone or brick around it. It’s made from sand and a linseed-oil-based binder and built up by hand. On older homes, it suits the building far better than silicone. We work on period & listed homes, sash and case windows and tenement windows, and people most often call us about draughty sash windows at the surround and mastic dropping out of the joint.
In a village or hamlet like Burnham Green, older cottages and farmhouses often have timber windows set in stone or brick. Older buildings like these do not always suit modern silicone, and sometimes a traditional sand mastic is the better choice.
Your job is guaranteed for a year, as with all our work.
- Where
- Burnham Green (AL6)
- Region
- Hertfordshire
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Honest limits
Before booking, it’s worth knowing the limits too:
- Masonry that needs repairing
- Planning or listed building consent (your local planning authority decides)
- Broken panes
Not sure which it is? You can call 0345 464 0079 or send us an email and we’ll tell you honestly before booking.
Joints and surfaces we work on
- Period & listed homes
- Brick reveals
- Stone surrounds
- Tenement windows
- Sash and case windows
- Timber door frames
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 does not work out, we can still put it right.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
Different surfaces, different methods
Stone surrounds
The stone is treated with care while raking out the old mastic.
Sash and case windows
Most of our sand mastic work is on sash windows. Each joint round the box is raked out and renewed.
What affects the quote in Burnham Green
You will get a clear quote before work begins. It’s based on:
- The size of the job
- Whether the work is at height
- The old material and how stubborn it is
- Mould in or behind the old joints
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 we need extra access for height. Your quote takes all of that into account.
What we need to know
When you contact us, these details help:
- What the problem is, such as mould, gaps, leaks or cracking
- Access, such as stairs, a lift or height
- Where the job is, and your postcode
- Roughly how big the job is
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. Whenever you’re ready, ring 0345 464 0079 or email us.
Why it’s worth doing now in Burnham Green
New mastic over crumbling mastic will not hold. Raking out and preparing the joint gives it a sound base so the new work lasts. In a small place like Burnham Green, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
Homes and businesses are quoted the same way: how much there is to do, how we reach it and what it needs, along with when we can work on site. Ask us for a quote and we’ll explain what it covers.
Why book with us
- Rated 4.9 stars on Google
- 20+ years of sealant experience
- Homes, businesses and hotels
- We leave the area clean and tidy
Take a look at what affects the cost and what customers say.
What happens on the day
Before we leave, we go over the finished joints with you. The visit itself normally takes a few hours per window, depending on the condition of the joints, depending on how much there is to do. Somewhere like Burnham Green needs a little journey planning: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- We fill deep gaps so the new mastic isn’t 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 about any water getting in
- Let us know about parking restrictions
- Move anything stored near the joints
How to get a quote
There’s no standard price list. Instead, your job gets its own clear quote. To get started, call 0345 464 0079 or send us an email.
Advice
Burnham Green homes and the weather
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. Historic houses like Digswell House (about 1.9 miles south-west) are a reminder that the area around Burnham Green has older buildings as well as new. 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.
Rented homes near Welwyn North station change hands often, and cracked sand mastic around sash windows lets in the draughts tenants complain about. Digswell House, about 1.9 miles south-west, is one of the historic houses in the wider area around Burnham Green, and older homes nearby need a sealant that suits their walls.
Burnham Green is about 3 miles north-east of Welwyn Garden City, in Hertfordshire. Across the AL6 area, our applicators can take on sand mastic. 381 places in Hertfordshire are on our list, from the larger towns to small villages. London is on our list too, around 23 miles away.
Work in AL6 works the same way as everywhere else we cover. Whether your property is on Burnham Close, Burgess Close and Burnham Green Road or anywhere close by, our applicators can take on the job. We also cover the places around Burnham Green: Tewin Wood (1 mile south-east), Harmer Green (1 mile west), Bull's Green (1 mile north-east), Tewin (1 mile south-east) and Oaklands (1 mile north-west). Larger places within reach include Watford (15 miles south-west), Hemel Hempstead (14 miles south-west), Stevenage (5 miles north), St Albans (9 miles south-west), Bishop's Stortford (14 miles east) and Welwyn Garden City (3 miles south-west).
Landmarks near Burnham Green
Around Burnham Green, our work takes us to homes and buildings near Belmont pub, among other places. The nearest railway station is Welwyn North station, about 1.2 miles south-west of the centre. Other landmarks nearby include Datchworth Museum (1.1 miles north) and Queen Elizabeth II Hospital (3.6 miles south). Green spaces nearby include Tewin Orchard and Hopkyns Wood.
Towns and villages near Burnham Green
More services for Burnham Green
When to call us in Burnham Green
Age is the main cause. Sand mastic is a maintenance item like any pointing, depending on exposure and upkeep.
If you can see any of these, it’s time to have the joints looked at:
- Weathered mastic on the most exposed windows
- A silicone bead on a sash window that spoils the look
- Cement or filler used on old window joints that has cracked
- Gaps where the frame meets the masonry
For site and facilities teams at buildings such as Monk's Walk School, the mastic around its windows and doors needs looking after like any other building’s.
What to look for in a quote
- Whether all the old sealant comes out first
- How the colour is chosen
- What insurance they hold
- When the joint can take water or movement
FAQs for Burnham Green
Will you come out to Burnham Green?
Yes, we do. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Can you do sand mastic in Burnham Green?
Yes. Our work covers London and the South East, and Burnham Green is part of that. Just phone 0345 464 0079 or drop us an email with a few details of the job, and we will give you a clear price.
Can you replace silicone on a period window with sand mastic?
Often, yes. Once the silicone is out and the joint prepared, sand mastic is applied by hand.
What’s sand mastic made of?
A traditional pointing material made from sand and a linseed-oil-based binder for the joint between timber frames and masonry.
Can tenants book the work?
Of course. Check with your landlord; we can send the quote to them too.
Is it OK to seal over old sealant?
No, it will not last. It may look fine at first, but the new bead soon lifts. Removing the old sealant completely is the only lasting way.
How long does sand mastic take to harden?
A skin forms quite soon, but full hardening takes longer. We’ll explain what to expect before we leave.
Where are you based?
We are based in Crawley, West Sussex, and we cover South East England, London and all of Scotland.