West Berkshire · England
Window & door mastic in Newbury, West Berkshire
Mastic around window and door frames, sills and patio doors in Newbury, with a 12-month guarantee on every job. Ask us for a quote.
- Cracked or shrunken mastic around the frame
- Whistling draughts around closed windows
- Leaking joints at the ends of sills
Why deal with it now?
Getting a straight, even bead on an outside frame takes practice, especially on upper floors. We cut out properly, back deep gaps and tool every joint neatly, in a sealant suited to the wall. In a family home in Newbury, a failed seal around a bath or a frame lets water into places you can’t see, like the floor under a bath, the back of a panel or the inside of a wall. Whatever the joint, failed sealant only gets worse.
Every job is a little different, so each one gets its own quote. Size, access and the product the joint needs all make a difference, and we’ll explain the quote if you ask.
Why us?
- Fully insured
- A 12-month guarantee on all work
- ARBOMaster approved applicator
- Sealant colour chosen to suit
Read what affects the cost or what customers say.
How we handle window mastic in Newbury
Some gaps around frames are far deeper than they look. Filling it with sealant alone leaves a joint that can’t move properly, so deep gaps get backing rod first. That way the new bead bonds to the frame and the wall only. Common call-outs are for cracked or shrunken mastic around the frame and leaking joints at the ends of sills, across composite doors, aluminium frames and timber windows & doors.
Plenty of homes in a town like Newbury have had conservatories, patio doors or new windows added over the years. Every addition brings more joints, each wearing at its own pace. Sills, frame heads and glazing joints are where leaks generally start.
Each job carries a 12-month guarantee, whatever its size.
- Where
- Newbury (RG14, RG19, RG18, RG20)
- Region
- West Berkshire
- Cover
- One year on every job
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Surface by surface
Aluminium frames
Bi-fold and sliding aluminium doors have long frame joints, and the bottom joint sees the most water. We prepare and reseal every joint, backing the deep ones.
Window sills
Where a sill meets brick or render, the ends often crack first. We reseal them so rain cannot run into the wall.
Window mastic in Newbury: local notes
The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like Shaw House (about 1 mile north) are a reminder that the area around Newbury 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.
If you live in an older home near St Nicolas Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. Letting a property close to Newbury station? Then renewing tired window mastic between tenants heads off draught and damp complaints. Managing a site like St Nicolas C.E. Junior School? Then larger buildings have plenty of frames, and the mastic around each one ages.
Newbury is about 15 miles west of Reading, in West Berkshire. Homes, rented property, offices and hotels in Newbury can book us for window mastic, old or new, large or small. The work is guaranteed for a year. Newbury is one of 155 towns and villages in West Berkshire we cover. There’s also a page for Reading, roughly 15 miles from Newbury.
Every address in RG14, RG19, RG18 and RG20 is within our area for window mastic, from the main roads to the quietest streets. Streets in the area include Market Street, London Road and Donnington Square. Main roads around Newbury include the A4 and A339. Other places close to Newbury include Greenham (1 mile south-east), Sandleford (1 mile south), Skinners Green (2 miles south-west), Wash Common (2 miles south-west) and Enborne (2 miles west). We also work in nearby towns such as Thatcham (3 miles east), Burghfield Common (11 miles east), Hungerford (8 miles west), Spencers Wood (15 miles east), Calcot (12 miles east) and Lambourn (12 miles north-west). Newbury is one of the larger places we cover in West Berkshire.
Around Newbury
Typical jobs here are in homes near Victoria Park, The Diamond Tap and St Bartholomew's School and the streets around them. There’s a railway station in Newbury itself: Newbury station. A little further out are Donnington Castle (1.6 miles north-west) and West Berkshire Community Hospital (1.5 miles east). Green spaces nearby include Audrey's Meadow.
The process
Good joint work is mostly preparation, so that’s where we spend the time. Every joint is cleaned and dried before new material goes in. All told, the work takes most of a day for a typical house, less for a few frames. A visit in Newbury needs access to the work and a place to park close by. If the job is outside, mention gates, side access and anything above ground floor.
- Each frame is looked over and we agree which ones need resealing.
- The old mastic is cut out and scraped back to clean surfaces.
- Where the gap is deep, backing rod goes in first.
- A flexible exterior sealant is applied in a colour to suit the frame.
- We tool each bead neatly and check every joint is closed.
Before we arrive
- Mention any parking rules near the property
- For indoor joints, keep the area dry beforehand if you can
- Mention if the joints have been sealed before
How to get a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we will talk you through what we’d do. Whenever you’re ready, call 0345 464 0079 or drop us an email.
Read more
What affects the quote in Newbury
Every job gets its own quote. This is what makes a difference:
- Whether there’s mould to deal with
- The amount of work
- The old material and how stubborn it is
- The product the joint needs
A few things move the cost up or down: the old material and how easily it comes out, 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 call or email, these details help:
- The problem you’ve noticed
- The type of property
- Any access issues, like height or stairs
- Whether it has been sealed before
For a quote, ring 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. We’ll give you a clear price before any work starts.
Can I do it myself?
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions.
What we can’t put right
Before booking, it’s worth knowing the limits too:
- Draughts through the window seals rather than the frame
- A frame that has rotted at the joint
- Condensation trapped between the panes
Not sure which it is? You can call 0345 464 0079 or drop us an email and we’ll tell you honestly.
Joints and surfaces we work on
- Window sills
- Timber windows & doors
- Aluminium frames
- Patio & French doors
- Composite doors
- uPVC windows
Looking after it afterwards
How long the joints last depends on use and care. Here’s what we suggest:
- Wipe condensation off the frames
- Paint up to the joint, not over it
- Keep drainage slots and sill grooves clear
- Keep jet washers away from the mastic
Check the drainage slots in the frames aren’t blocked, so water can run away instead of sitting against the joint.
Leaks usually show up in wet, windy weather, but sealant goes on best when frames and walls are dry. Dealing with it when you first notice a crack avoids chasing leaks through the wet months.
Newbury: your questions answered
Can you do window mastic in Newbury?
Yes, Newbury is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or email us and let us know what needs doing.
Do you work for landlords with property near Newbury station?
Yes, we work for letting agents and landlords. Just ring 0345 464 0079 or drop us an email and tell us about the property, and we will send you a clear quote.
What do you put in the joint?
Each joint gets the product that suits it. Movement, water and weather all affect the choice, and we will explain our choice.
Can I do it myself?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Will the old sealant be removed?
Yes. We cut out all the old sealant and clean the joint before applying anything new.
How long should I leave it?
Most sealants are touch-dry well before they’re fully cured. We’ll give you the cure time for the product we used before we leave.
Is it OK to seal over old sealant?
No. Fresh sealant doesn’t stick to old sealant, and it traps any mould or water underneath. We remove it all first.
Does the work come with a guarantee?
Yes. Our 12-month guarantee covers every job.