Hertfordshire · England
Window Mastic in Daw's End
Mastic around window and door frames, sills and patio doors in Daw's End, with a one-year guarantee on every job. Call for a quick quote.
- Gaps between the frame and the inside reveal
- Water coming in at the bottom corners of a door
- Draughts coming in around windows and doors
Different surfaces, different methods
uPVC windows
Plastic frames move a lot between a hot afternoon and a cold night, so the joint needs a low-modulus sealant that stays flexible. White is the usual colour, with brown, anthracite grey and black for coloured frames.
Timber windows & doors
Soft or rotten wood cannot be sealed successfully. We will point out any rot we find, as that is a job for a joiner.
How we handle window mastic in Daw's End
Over two decades of sealing frames has taught us which products suit which walls. We’re fully insured ARBOMaster approved applicators, and every job is covered by a 12-month guarantee. We work on patio & French doors, timber windows & doors and uPVC windows, and common reasons people get in touch are water coming in at the bottom corners of a door and gaps left after new windows were fitted.
In a village or hamlet like Daw's End, 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.
Each job carries a 12-month guarantee.
- Place
- Daw's End (SG9)
- Wider area
- Hertfordshire
- Cover
- 12 months on all our work
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
How to look after the new joints
Looking after new joints is easy:
- Repaint timber before it’s bare
- Keep paint off silicone joints
- Wash the frames with mild soapy water
- Ventilate rooms so frames don’t stay wet inside
Silicone cannot normally be painted, so if you are planning to paint the frames or walls, tell us beforehand. We can use a paintable sealant where that matters.
Draughts get worse, not better. As old mastic keeps shrinking, the gap widens, and a cold room gets colder. A new joint closes it up.
Common problems we fix in Daw's End
On timber frames, paint and putty build up around the joint. Old mastic gets painted over and cracks under the paint, and the wood moves with damp as well as heat.
People generally contact us after spotting one of these:
- White mastic on grey or black frames
- Gaps left after new windows were fitted
- Gaps between the frame and the inside reveal
- Black, perished sealant on frames
For site and facilities teams at buildings such as Anstey First School, its window and door frames need their mastic kept sound, just like a home’s.
Comparing quotes
- What product goes in the joint
- How long to leave it before use
- Who does the work, and how experienced they are
- Whether VAT is included
How we quote for window mastic
You’ll get a clear quote before work begins. It’s based on:
- How much old sealant there is and how hard it is to remove
- The type of sealant required
- Mould in or behind the old joints
- The number and length of the joints
What it costs depends on how much there is to do, how hard the old material is to remove and how easy the joints are to reach. You’ll have a clear quote before any work starts.
Helping us quote
Before you ask for a quote, have a think about:
- The type of property
- If someone has resealed it before
- Photos by email, if that’s easy
- Any access issues, like height or stairs
To get a quote, phone 0345 464 0079 or email us and tell us where the job is and what the problem looks like. You’ll have a clear quote before any work starts.
Why deal with it now?
A quick bead over the top of old mastic looks like an easy fix, but new sealant cannot bond to old, crumbling mastic. It soon lifts and the leak carries on behind it. Proper resealing starts with removing the old joint. Older cottages and farmhouses around Daw's End can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
We don’t show prices on the website, because the cost depends so much on the job itself. For a quick quote, please call 0345 464 0079 or drop us an email.
What you get with us
- You choose the colour before work begins
- Full insurance on every job
- Tidy, careful work
- Sealant colour chosen to suit
Take a look at how sealant jobs are priced and 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 need the right product, the right access and the right method.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
What happens on the day
When we arrive, we start by going over the job with you. Surfaces next to the work are protected before any work begins. The work normally takes most of a day for a typical house, less for a few frames. Somewhere as small as Daw's End, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- First, we confirm safe access to each frame.
- All the failed sealant is cut away, along with any loose debris.
- Frame and wall are cleaned and must be dry before sealing.
- Backing rod fills deep voids and the sealant goes in on top.
- We tool the joint so water runs off, then clear up.
Preparing for the visit
- Let us know about stairs, lifts or work at height
- Let us know if you’ve seen damp or leaks
- Keep pets and children clear of the area while we work
How to get a quote
For a quick quote, get us on the phone, or email us if that’s easier. Tell us about the joints that need doing and we’ll talk you through the work.
Advice
Your questions about window mastic in Daw's End
What guarantee comes with window mastic in Daw's End?
All our work, in Daw's End and everywhere else, comes with a 12-month guarantee. We are fully insured, and an ARBOMaster approved applicator.
Is Daw's End within the area you cover?
Yes, smaller places are covered as well as towns. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Where do you work from?
Our base is in Crawley, West Sussex, and we cover South East England, London and all of Scotland.
Can you get sealant to suit coloured frames?
Yes, we choose a colour to suit the frame. Grey and black frames get grey or black sealant, and wood-effect frames usually suit brown.
Will resealing my frames help with draughts?
Often, yes. Air often gets in between the frame and the wall, and resealing inside and out closes it.
Are you ARBOMaster approved?
Yes. We’re approved under the ARBOMaster scheme.
Do I need to be at home?
It depends on the job. Inside work needs someone to give us access, and for outside work we will agree access with you when we book.
Can new sealant go over the old?
No, it will not last. It may look fine at first, but the new layer lifts away from the old one. Removing the old sealant completely is the only lasting way.
Also near Daw's End
Other services in Daw's End
What window mastic looks like in Daw's End
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.
If you live in an older home near Church of St George, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Daw's End is in Hertfordshire. Whether you’re in the middle of Daw's End or further out, we cover window mastic for every kind of property, from flats and houses to offices and hotels. We cover 381 towns and villages across Hertfordshire. There’s also a page for Chelmsford, roughly 25 miles from Daw's End.
Our applicators cover all of the SG9 postcode area for window mastic and the streets around it. We also cover Anstey (1 mile north), Great Hormead (1 mile south), Wyddial (2 miles west), Brent Pelham (2 miles south-east) and Lower Green (2 miles north-east). We also work in nearby towns such as Stevenage (11 miles south-west), Bishop's Stortford (9 miles south-east), Hitchin (13 miles west), Hoddesdon (15 miles south), Hertford (13 miles south-west) and Letchworth (11 miles west).
Near you in Daw's End
Around Daw's End, our work takes us to homes and buildings near The Blind Fiddler pub. A little further out are Anstey Hales Farm (0.6 miles north-east). Green spaces nearby include Hawkins Wood.