Oxfordshire · England
Window Mastic in Highmoor
Mastic around window and door frames, sills and patio doors for Highmoor, backed by a one-year guarantee. Call for a quick quote.
- Water coming in at the bottom corners of a door
- Hard, cracked sealant around windows
- Old mastic that has gone black or come away
How we handle window mastic in Highmoor
Colour matters on a frame. White, brown, anthracite grey, black and clear sealants are all available, so the bead blends with the window rather than framing it. We’re often asked to deal with old mastic that has gone black or come away and cracked internal joints between frame and plaster, across patio & French doors, timber windows & doors and uPVC windows.
Outdoor sealant needs dry, clean surfaces, so work on frames around Highmoor is planned for dry weather. Tell us about access to every side of the house, including upper-floor windows.
We stand behind the work with a 12-month guarantee, so you are not left on your own once the job is done.
- Where
- Highmoor (RG9)
- Wider area
- Oxfordshire
- Cover
- One year on every job
- Quotes
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Common questions in Highmoor
Is Highmoor in your area for window mastic?
Yes. We work across London and the South East, and Highmoor is part of that. You can phone 0345 464 0079 or send us an email and tell us what needs doing.
Do you work for landlords with property near Henley-On-Thames station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. Just phone 0345 464 0079 or drop us an email with the address and what needs doing, and we will give you a clear quote.
Is there any odour?
There can be a smell while the sealant cures, but it fades. Opening a window helps.
Where do you work from?
We work from Crawley. Our applicators cover Highmoor.
Can you do the inside joint as well?
Yes, we do both. Inside, the joint between frame and plaster is sealed neatly.
Are you an approved applicator?
Yes. We are an ARBOMaster approved applicator, the approved applicator scheme for Arbo sealants.
Do you have insurance?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
Do you do commercial work?
Yes. Larger jobs can be planned room by room or area by area.
Why act early in Highmoor
The work is quick compared with the damage it prevents: the visit takes a morning for a couple of windows and a door. Wait for damp to appear and there may be plaster and decorating to sort out too. Where a wall is exposed, as many are in small places like Highmoor, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Leaving a failed joint generally makes the job bigger, not smaller. If you’re unsure, call 0345 464 0079 or email us and we will give you an honest view and a quote.
Why book with us
- Sanitary silicone with an anti-fungal additive in wet areas
- White, clear, grey or another colour, product permitting
- Trusted Arbo and Everbuild sealants
- 180+ five-star Google reviews
Read what affects the cost or our reviews.
Can I do it myself?
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
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.
Landlord and commercial work in Highmoor
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. Several properties can be quoted together.
If you manage several properties in or around Highmoor, jobs at different addresses can go on one quote. Send us the addresses and the work at each.
What we do, step by step
When we arrive, we look over the joints with you first, so there are no surprises. We protect the surfaces around the joints before any work begins. The work usually takes a few hours for a handful of frames, longer for a whole house. Somewhere as small as Highmoor, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First, we go round the frames with you and agree the list.
- 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.
- Every joint is tooled smooth and checked before we leave.
How to prepare
- On commercial sites, let us know about site rules
- Keep children and pets away from the work area
- Tell us about access, such as stairs, a lift or high-level joints
Ask for a quote
Need a quote? Please ring 0345 464 0079 or drop us an email and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.
Advice
What we’re called out for in Highmoor
Mastic ages in the weather. UV light hardens the outside of the bead, and over the years it loses its give, cracks and comes away.
The problems people normally mention when they call are:
- Black, perished sealant on frames
- Sealant in the wrong colour for the frame
- Cracked sealant at the sill ends
- Cracked internal joints between frame and plaster
Homes close to Church of St Paul include some older properties, and the joint between an old wall and a newer frame is normally the first place rain gets in.
Before you book anyone
- What happens if the job turns out different
- Whether VAT is included
- How much experience the applicator has
- Whether you can choose the colour
Towns and villages near Highmoor
Also in Highmoor
When it isn’t the sealant
In fairness, some problems need a different trade:
- A door that needs adjusting, rehanging or new seals
- Damp problems in the wall away from the window
- A failed sealed unit that has misted up
If you are not sure, just ring 0345 464 0079 or drop us an email and we will give you a straight answer.
Where we work in Highmoor
- Aluminium frames
- Patio & French doors
- Timber windows & doors
- Window sills
- Composite doors
- uPVC windows
What affects the cost of window mastic
We quote each job individually. These are the things that affect it:
- The product the joint needs
- Whether the work is at height
- How many areas need sealing
- Any working-time requirements on site
What it costs depends on the size of the job, how hard the old material is to remove and access to the work. We give a clear quote before any work starts.
Helping us quote
Photos help, but a description is a good start. Try to tell us:
- Where the job is, and your postcode
- How many joints, rooms or windows are involved
- If someone has resealed it before
- The problem you’ve noticed
Asking for a quote is easy: let us know what needs doing and where and its rough size. Photos by email help us understand the job, and we’ll come back to you with a quote.
Highmoor homes and the weather
Historic houses like Greys Court (about 2 miles south-east) are a reminder that the area around Highmoor 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. London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you look after a building such as Stoke Row Church of England School, larger buildings have plenty of frames, and the mastic around each one ages. If you let a flat or house near Henley-On-Thames station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Highmoor is about 4 miles north-west of Henley-on-Thames, in Oxfordshire. Wherever you are in the RG9 postcode area, we cover window mastic for homes and businesses. 443 places in Oxfordshire are on our list, from the larger towns to small villages. Our Reading page covers work nearby (7 miles or so).
Postcode districts we cover here for window mastic: RG9. Streets in the area include The Glebe and Holly Close, and we cover them all. Neighbouring places we cover for window mastic include Highmoor Cross (1 mile south-east), Shepherd's Green (1 mile south-east), Catslip (1 mile north-east), Nettlebed (2 miles north) and Kingwood Common (2 miles south). Larger places within reach include Didcot (11 miles west), Abingdon-on-Thames (15 miles north-west), Thame (13 miles north), Henley-on-Thames (4 miles south-east), Benson (6 miles north-west) and Chinnor (11 miles north).
Local landmarks in Highmoor
Locally, jobs take us to homes and businesses close to The Dog and Duck pub. For rail, the closest station is Henley-On-Thames station, roughly 4.5 miles east. Green spaces nearby include Warburg Nature Reserve.