West Berkshire · England
Window Mastic in Ashmansworth
Mastic around window and door frames, sills and patio doors for Ashmansworth, backed by a 12-month guarantee. Call for a quick quote.
- Old mastic that has gone black or come away
- Gaps left after new windows were fitted
- Leaking joints at the ends of sills
Surface by surface
Patio & French doors
Patio and French doors have the longest joints on most houses. Most leaks start at the bottom corners, so we pay close attention there.
Timber windows & doors
Where timber has rotted at the joint, it needs repairing first. If we find rot, we will tell you before going ahead, as a joiner will need to deal with it.
How we handle window mastic in Ashmansworth
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. Common call-outs are for sealant in the wrong colour for the frame and gaps left after new windows were fitted, on uPVC windows, window sills and composite doors.
Around Ashmansworth, many homes face open ground, so their windows and doors take the full weather. That exposure dries out and cracks the mastic around frames and sills faster.
You get a 12-month guarantee, the same in Ashmansworth as everywhere else we work.
- Where
- Ashmansworth (RG20)
- Wider area
- West Berkshire
- Cover
- 12 months on all our work
- Quotes
- A clear price before we start
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
How to look after the new joints
How long the joints last depends on use and care. Here’s what we suggest:
- Check the mastic once a year
- Keep drainage slots and sill grooves clear
- Don’t use solvent cleaners on the joint
- Keep timber frames painted
Try not to touch the new joint while it cures, for as long as we advise. Keep jet washers away from the frames.
Signs to watch for: split or missing mastic, gaps, damp patches inside or black mould on the reveal. Any of these is worth a call.
Common problems we fix in Ashmansworth
Plenty of failed mastic was poorly applied in the first place. Sealant run over dust, wet brick or loose mortar never bonded as it should, so it comes away long before its time.
These are the problems we are asked about most:
- Cold air getting in at the frame edge
- Leaking joints at the ends of sills
- White mastic on grey or black frames
- Gaps between the frame and the inside reveal
Homes close to Church of St James include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
What to look for in a quote
- How the joint is cleaned and prepared
- What the quote includes, VAT included or not
- What happens if they find a problem under the old sealant
- Whether the sealant suits the joint
Places near Ashmansworth
Other services in Ashmansworth
FAQs for Ashmansworth
Will you come out to Ashmansworth?
Yes. Ashmansworth is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Is window mastic in Ashmansworth guaranteed?
All our work, in Ashmansworth and everywhere else, comes with a 12-month guarantee. We are fully insured, and an ARBOMaster approved applicator.
Is it OK to seal over old sealant?
No. New silicone won’t bond to old silicone, and it traps any mould or water underneath. We remove it all first.
Can you do the inside joint as well?
Yes. Draughts often come through the inside gap too, so it can be worth sealing both.
What do you put in the joint?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference.
What information do you need?
Where the job is, what the problem is and roughly how big it is. If you can, email a few photos.
Can you quote for more than one area?
Yes. More than one area can be quoted together.
When is the sealant fully cured?
Many sealants skin over quickly but take longer to cure fully. We’ll tell you how long to leave the joint.
What happens on the day
We bring everything the job needs with us. After a quick look at the joints together, the area is protected and the work begins. It normally takes a morning for a couple of windows and a door. For a village or hamlet like Ashmansworth, the journey is planned in advance: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- First we look at every frame and agree the list.
- We remove the old mastic and clean the frame and the wall.
- Deep gaps are filled with backing rod to set the depth.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- Every joint is checked before we leave.
Preparing for the visit
- For business premises, tell us about site rules or sign-in
- Let us know about earlier repairs to the joints
- Try not to wet indoor joints just before the visit
Getting a quote
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is. Whenever you are ready, ring 0345 464 0079 or send us an email.
Advice
What sealant work cannot fix
Sealant isn’t the answer to every problem, and we’ll tell you before any work starts. It won’t solve:
- Damp coming through the wall itself rather than the frame joint
- A door that needs adjusting, rehanging or new seals
- Rotten timber, which needs a joiner first
Not sure which it is? You can ring 0345 464 0079 or send us an email and we will tell you honestly.
What we seal
- Patio & French doors
- uPVC windows
- Timber windows & doors
- Aluminium frames
- Window sills
- Composite doors
What affects the cost of window mastic
We quote each job individually. This is what makes a difference:
- The size of the job
- Which sealant suits the joint
- How much old sealant there is and how hard it is to remove
- Working hours on commercial sites
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. You will know the price before we begin.
Asking for a quote
To make quoting easier, please include:
- The rough size of the job
- Any access issues, like height or stairs
- What the problem is, such as mould, gaps, leaks or cracking
- Photos by email, if that is easy
For a quick quote, get us on the phone, or send an email if you’d rather. Tell us about the joints that need doing and we will talk you through the work and send you a clear quote.
Landlords, agents and businesses in Ashmansworth
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
We also work for property managers and facilities teams. Several sites can be quoted together, and we are fully insured for the work.
Ashmansworth homes and the weather
Historic houses like Highclere Castle (about 1.9 miles north-east) are a reminder that the area around Ashmansworth 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. The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
In and around Ashmansworth, as anywhere, good window mastic starts with a clean, dry, properly prepared joint.
Ashmansworth is about 7 miles south-west of Newbury, in West Berkshire. Across the RG20 area, we can carry out window mastic at your property. Ashmansworth is one of 155 places in West Berkshire where we work. We also work in Reading, around 21 miles away.
All of RG20 is within our area for window mastic. Neighbouring places we cover for window mastic include Test Valley (1 mile west), Vernham Street (4 miles west), Hell Corner (5 miles north-west), Upper Green (5 miles north-west) and Inkpen Common (5 miles north-west). Larger places within reach include Newbury (7 miles north-east), Thatcham (9 miles north-east), Speenhamland (7 miles north-east), Hungerford (8 miles north-west), Lambourn (14 miles north) and Shaw (7 miles north-east).
Local landmarks in Ashmansworth
Open spaces near Ashmansworth include Sidown Hill.