Hertfordshire · England
Sand Mastic in Poynders End
Professional sand mastic in and around Poynders End, with every bit of old sealant taken out first.
- Crumbling sand mastic round a window
- Window mastic to renew ahead of painting
- Wind and rain getting in round a sash window
Sand mastic in Poynders End, done properly
Sand mastic suits most period window surrounds. On modern frames we’d normally use a flexible sealant and we will explain which is best for yours. We work on tenement windows, stone surrounds and sash and case windows, and common reasons people get in touch are old sand mastic that has cracked, crumbled or fallen out and wind and rain getting in round a sash window.
In a village or hamlet like Poynders End, older cottages and farmhouses often have timber windows set in stone or brick. Older buildings like these don’t always suit modern silicone, so the sealant has to be chosen to suit the building.
The work is guaranteed for twelve months. If something is not right with it in that time, tell us and we will put it right.
- Where
- Poynders End (SG4)
- Wider area
- Hertfordshire
- Guarantee
- A year, on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Why it’s worth doing now in Poynders End
Not every draught comes from the sashes themselves. Gaps between the frame and the wall can be just as bad, and renewing the mastic closes them. Where a wall is exposed, as many are in small places like Poynders End, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, along with when we can work on site. Ask us for a quote and we will go through it with you.
Why Poynders End customers choose us
- Full insurance on every job
- 180+ five-star Google reviews
- Tidy, careful work
- ARBOMaster approved applicator
Read our cost guide and customer reviews.
Quotes for sand mastic in Poynders End
The price is agreed before any work begins. It’s based on:
- How much old sealant there is and how hard it is to remove
- Whether the work is at height
- The size of the job
- When we can work, for business premises
What you pay reflects the work, not a rough estimate. That is why we ask about the job first.
What to tell us for a quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- How many joints, rooms or windows are involved
- Where the job is, and your postcode
- If someone has resealed it before
- What’s wrong with the joints now
For sand mastic in Poynders End, phone 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and you’ll get a clear quote before work begins.
Sand mastic in Poynders End: local notes
Historic houses like Knebworth House (about 3.5 miles south-east) are a reminder that the area around Poynders End has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For an older house near a landmark such as Church of St Martin, frames set in older brick or stone need a sealant that suits the wall as well as the frame. If you let a flat or house near Stevenage station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Poynders End is about 3 miles south of Hitchin, in Hertfordshire. Wherever you are in the SG4 postcode area, we can carry out sand mastic at your property. Across Hertfordshire, we cover 381 places, Poynders End among them. We also work in London, about 29 miles from Poynders End.
We work across the SG4 postcode area for sand mastic. We also cover the places around Poynders End: Temple Dinsley (1 mile south-west), Preston (1 mile west), Langley End (1 mile south-east), Little Almshoe (1 mile north-east) and St Ibbs (1 mile north). Within a short drive, we also cover Hemel Hempstead (13 miles south-west), Stevenage (4 miles east), St Albans (11 miles south), Welwyn Garden City (8 miles south-east), Harpenden (7 miles south-west) and Hitchin (3 miles north).
Local landmarks in Poynders End
Around Poynders End, our work takes us to homes and buildings near The Red Lion Public House. For rail, the closest station is Stevenage station, roughly 2.8 miles east. Other landmarks nearby include Wymondley Castle (2.8 miles north-east) and North Hertfordshire Museum (2.8 miles north). Not far away are Purwell Ninesprings and Markham's Hill.
What we do, step by step
There is not much for you to do on the day. Show us the job and we will take it from there. The job generally takes a few hours per window, depending on the condition of the joints from start to finish. Somewhere like Poynders End 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 look at the surrounds with you and agree the joints to renew.
- Old mastic and any loose material are raked out.
- We pack any deep voids first.
- We apply the mastic by hand and shape it.
- We dress the finish so it sits neatly against the masonry.
Getting ready for the visit
- Tell us about any water getting in
- Move anything stored near the joints
- Mention any sign-in or site rules at work premises
Getting a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we will talk you through the work.
Advice
Poynders End questions
Can you help a landlord with a rental near Stevenage station?
Yes, rental work is part of what we do. You can phone 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before work begins.
Do you cover smaller places like Poynders End?
Yes, Poynders End is covered. We work across London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
What exactly is sand mastic?
It’s sand mixed with a linseed-oil-based binder for the joint between timber frames and masonry.
Do you offer different sealant colours?
Most of the time, yes. We will tell you which colours the right product comes in and agree one before any work starts.
Will there be a smell?
It depends on the product. Some products have a noticeable smell, others very little.
How long does sand mastic take to harden?
Not straight away. The skin forms first, and the full set comes later, and we’ll tell you what to expect.
How long does sand mastic take?
Most jobs take a few hours per window, depending on the condition of the joints, including the preparation. Your quote will say how long we expect yours to take.
What should I tell you?
Just the basics: where it is, what you’ve noticed and how we reach it. Then ring 0345 464 0079 or email us.
For landlords and businesses
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a one-year guarantee.
For anyone letting property in or around Poynders End, several properties can be quoted together. Just tell us the addresses and what each one needs.
When it is not the sealant
To be straight with you, there are a few things sealant will not fix:
- Sash cords, weights and draught-proofing of the sashes
- Broken panes
- Planning or listed building consent (your local planning authority decides)
If you are not sure, just phone 0345 464 0079 or drop us an email and we will give you a straight answer.
Joints and surfaces we work on
- Sash and case windows
- Period & listed homes
- Tenement windows
- Timber door frames
- Brick reveals
- Stone surrounds
Signs you need sand mastic in Poynders End
Paint, silicone or cement used over old mastic causes problems. They don’t move with the timber and we normally remove them.
Look out for these signs:
- A silicone bead on a sash window that spoils the look
- Mastic dropping out of the joint
- Gaps between timber frames and stone or brick
- Patchy fillers round a sash window
Schools such as Preston Primary School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s.
Before booking anyone
- Whether all the old sealant comes out first
- Whether the sealant suits the joint
- Whether they’re fully insured
- How long the guarantee is
DIY versus a professional finish
A DIY attempt does not rule out a professional job. We cut it out and start again, so just mention it when you contact us.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.