Hertfordshire · England
Window & door mastic in Astwick, Hertfordshire
Professional window mastic in and around Astwick, with every bit of old sealant taken out first and a 12-month guarantee.
- Mastic that is falling out in pieces
- Cracked internal joints between frame and plaster
- Water coming in at the bottom corners of a door
About our window mastic in Astwick
There are two joints on most windows. Outside, the mastic keeps rain out; the internal joint closes the gap to the plaster and stops draughts. Either or both can be done. If you’re dealing with draughty joints inside around the window and white mastic on grey or black frames, we can put it right, whatever the surface.
Somewhere as small as Astwick, older homes often have timber frames set in stone or brickwork. Not every older frame suits a modern silicone bead, so the sealant has to be chosen to suit the building.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we will sort it.
- Where
- Astwick (SG5)
- Wider area
- Hertfordshire
- Cover
- A year, on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Questions from Astwick
Can you do window mastic in Astwick?
Yes, Astwick is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or drop us an email with a few details of the job, and we’ll send you a clear quote.
Can you help a landlord with a rental near Arlesey station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. Just call 0345 464 0079 or send us an email with the address and what needs doing, and we will give you a clear quote.
Can you do the inside joint as well?
Yes. Draughts often come through the inside gap too, so it can be worth sealing both.
Does the work come with a guarantee?
Yes, with our 12-month guarantee. A yearly look at the joints helps them last.
How long does it take to reseal the windows on a house?
That depends on the number of frames, how they’re reached and the state of the old mastic. We will tell you how long your job needs when we quote.
Can I add another job to the visit?
Yes. Several rooms, windows or areas can go on one quote.
How much does window mastic cost in Astwick?
It depends on the job, so we quote each one individually. For a quick quote, call 0345 464 0079 or drop us an email and let us know what needs doing and where.
Do I have to be there?
That depends on where the joints are. Inside work needs someone to give us access, while outside work can sometimes be arranged differently.
Aftercare tips
Joint life depends on how it’s used and looked after. We suggest:
- Ventilate rooms so frames don’t stay wet inside
- Keep solvents and bleach off the sealant
- Paint up to the joint, not over it
- Clean frames with a soft cloth and soapy water
On timber frames, keep the paintwork in good order, because bare, wet timber moves more and pulls at the joint. Keep paint off the silicone itself.
On timber windows, water behind the joint can lead to rot. Once wood has rotted, it needs repair before it can be sealed, so early resealing is worth it.
Also near Astwick
Other services in Astwick
Different surfaces, different methods
Timber windows & doors
On period timber windows, traditional sand mastic is sometimes the better choice. We can talk through the options.
Aluminium frames
Metal frames expand in the sun and are often slim, with little room for error. A tidy bead in anthracite grey, black or a matching colour suits the frame.
When something else is needed
Honest advice matters more to us than a booking, so here’s what new sealant will not do:
- Soft or decayed wood in the frame
- A failed sealed unit that has misted up
- Draughts through the window seals rather than the frame
If you are not sure, just phone 0345 464 0079 or drop us an email and we’ll give you a straight answer.
Where we work in Astwick
- uPVC windows
- Window sills
- Timber windows & doors
- Aluminium frames
- Patio & French doors
- Composite doors
Windows and doors in Astwick
Historic houses like Hinxworth Place (about 1.7 miles east) are a reminder that the area around Astwick has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window. Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you let a flat or house near Arlesey station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. Schools such as St Mary's CofE Academy Stotfold are buildings too, and the mastic around its windows and doors needs looking after like any other building’s. For an older house near a landmark such as Church of Saint Guthlac, the joint between an old wall and a newer frame is generally the first place rain gets in.
Astwick is about 1 mile north of Stotfold, in Hertfordshire. For window mastic in and around Astwick, please phone 0345 464 0079 or email us for a quick quote. We’re based in Crawley and cover Hertfordshire. Our Hertfordshire coverage runs to 381 places, and Astwick is one of them. You can also see our page for London, about 37 miles away.
All of SG5 is covered for window mastic, from the main roads to the quietest streets. Local streets include Astwick Road and Sycamore Avenue, and we cover them all. Close by, we work in Stotfold Common (1 mile south), Stotfold (1 mile south) and Radwell (2 miles south-east). Larger places within reach include Stevenage (9 miles south), Hitchin (6 miles south), Letchworth (4 miles south), Letchworth Garden City (4 miles south), Baldock (4 miles south-east) and Benslow (6 miles south).
Near you in Astwick
The closest station to Astwick is Arlesey station, roughly 1.5 miles west of the centre. Other landmarks nearby include Fairfield Hospital (2.2 miles south) and Bygrave House (3.6 miles south-east). Not far away are Arlesey Old Moat and Glebe Meadows.
Why act early in Astwick
Running fresh sealant over the old joint is tempting, but it won’t grip old, dirty sealant. It soon lifts and the leak carries on behind it. Proper resealing starts with removing the old joint. Where a wall is exposed, as many are in small places like Astwick, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Every job is a little different, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all play a part.
Why book with us
- Arbo and Everbuild products
- More than 20 years in sealant work
- 180+ five-star Google reviews
- Approved under the ARBOMaster scheme
Take a look at our cost guide or customer reviews.
What affects the quote in Astwick
There’s no set price list. What we look at:
- How many areas need sealing
- The product the joint needs
- When we can work, for business premises
- Whether the work is at height
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
Helping us quote
When you contact us, these details help:
- Any access issues, like height or stairs
- Whether it’s a home or a business
- What the problem is, such as mould, gaps, leaks or cracking
- Where the property is
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and email pictures if that’s easy.
What we do, step by step
When we arrive, we look over the joints with you first. Surfaces next to the work are protected before any work begins. The work normally takes anything from an hour or two to a full day, depending on how many frames there are. Somewhere as small as Astwick, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We check how each frame can be reached safely.
- Old, cracked mastic is removed completely.
- The surfaces are cleaned and left dry.
- Backing rod fills deep voids and the sealant goes in on top.
- We tool the joint so water runs off, then clear up.
Before we arrive
- Tell us if parking is tricky
- Let us know about earlier repairs to the joints
- Move anything stored near the joints
Get a quote
Asking for a quote is easy: let us know the job and the location, and roughly how big it is. Photos by email help us understand the job.
Advice
Can I do it myself?
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.