Oxfordshire · England
Henwood Window Mastic
Professional window mastic in and around Henwood, with every bit of old sealant taken out first and a 12-month guarantee.
- Rain getting in at the frame or under the sill
- Hard, cracked sealant around windows
- Cracked sealant at the sill ends
Window mastic for homes and businesses in Henwood
Around Henwood we seal all kinds of frames: from uPVC casements to timber and aluminium, along with patio doors, French doors and sills. Each gets a sealant chosen for the frame and the wall it meets. We work on composite doors, uPVC windows and timber windows & doors, and people most often call us about gaps left after new windows were fitted and cracked internal joints between frame and plaster.
In a village or hamlet like Henwood, older cottages and farmhouses often have timber windows set in stone or brick. Older buildings like these do not always suit modern silicone, so the sealant has to be chosen to suit the building.
There’s a 12-month guarantee on every job, whatever its size.
- Location
- Henwood (OX1)
- Wider area
- Oxfordshire
- Cover
- 12 months on all our work
- Price
- A clear price before we start
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Why it’s worth doing now in Henwood
Choosing the product is half the job. Decorators’ caulk and bathroom silicone aren’t designed for outside joints that move. A low-modulus exterior sealant keeps its stretch through hot and cold weather. Older cottages and farmhouses around Henwood can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
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. We take all of that into account in your quote.
Why choose Mr Mastic in Henwood
- Experience in homes, commercial sites and hotels
- We leave the area clean and tidy
- Colour agreed with you before work begins
- ARBOMaster approved applicator
Take a look at our cost guide and what customers say.
How the visit works
On the day, we start by going over the job with you, so you know exactly what we’re doing. Surfaces next to the work are protected before any work begins. Most jobs take most of a day for a typical house, less for a few frames. In a small place like Henwood, access is generally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We check each frame and agree which ones need doing.
- We remove the old mastic and clean the frame and the wall.
- Where gaps are deep, backing rod goes in first.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- We clear up and check every joint is fully closed.
Preparing for the visit
- Mention any sign-in or site rules at work premises
- Mention if the joints have been sealed before
- Clear the area around the work
Get a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we’ll talk you through what we’d do. When it suits you, phone 0345 464 0079 or email us.
Related advice
Work for landlords, hotels and businesses
If you manage several properties in or around Henwood, several properties can go on one quote. Just tell us the addresses and what each one needs, and photos by email help.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
DIY versus a professional finish
A DIY attempt does not rule out a professional job. We cut it out and start again, so tell us about it when you ask for a quote.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
What affects the quote in Henwood
Every job gets its own quote. This is what makes a difference:
- The type of sealant required
- Mould in or behind the old joints
- Whether old sealant or filler has to be cut out
- How many areas need sealing
The cost reflects the work involved, not guesswork. That is why we ask about the job first.
Helping us quote
You don’t need to know the technical terms. Just tell us:
- How we’d reach the joints
- The problem you’ve noticed
- Whether it has been sealed before
- Whether it’s a home or a business
We quote each job on its own, so the first step is telling us about yours. Simply call 0345 464 0079 or email us and describe the job.
Also near Henwood
What else we do in Henwood
Keeping the joints in good condition
Good habits help new joints last longer. A few tips:
- Check the mastic once a year
- Keep jet washers away from the mastic
- Wipe condensation off the frames
- Make sure the drainage slots aren’t blocked
A yearly look round the frames is enough. Small splits are simple to catch before they leak, and if anything looks wrong, just call 0345 464 0079 or send us an email.
Water trapped behind a failed joint can start rot in timber frames and sills. Rotten timber needs a joiner, not a sealant, so early resealing is worth it.
Common questions in Henwood
Is Henwood in your area for window mastic?
Yes, Henwood is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or drop us an email and let us know what needs doing, and we’ll give you a clear quote.
Can you help a landlord with a rental near Oxford station?
Yes. We work for landlords and letting agents as well as homeowners. Just phone 0345 464 0079 or send us an email with the address and what needs doing, and we will send you a clear quote.
Can new window sealant be painted?
Most silicone cannot be painted. Let us know beforehand, and we’ll use a paintable product where it suits.
Is the work guaranteed?
Yes. Our 12-month guarantee covers every job, inside or out.
Can you seal the gap between the frame and the plaster indoors?
Yes. Plenty of draughts come through the inside joint as well as the outside, so sealing both is often worthwhile.
Should I try DIY first?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
Which products do you use?
Each joint gets the product that suits it. Movement, water and weather all affect the choice.
Is it OK to seal over old sealant?
No, and we never do. 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.
What window mastic looks like in Henwood
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. Historic houses like Appleton Manor (about 1.7 miles west) are a reminder that the area around Henwood 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 Church of St Peter, frames set in older brick or stone need a sealant that suits the wall as well as the frame. Rented homes near Oxford station change hands often, and cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Henwood is about 3 miles north-west of Abingdon-on-Thames, in Oxfordshire. Whether you’re in the middle of Henwood or further out, window mastic is available for homes and businesses alike. Our Oxfordshire coverage runs to 443 places, and Henwood is one of them.
We work across OX1 for window mastic. We cover properties on Cumnor Road, Hill View Lane and White Hill Lane and the roads around them. We also cover the places around Henwood: Wootton (1 mile south), Cumnor (1 mile north-west), Chawley (1 mile north), Appleton (2 miles west) and Dean Court (2 miles north). Further out, we also cover Oxford (5 miles north-east), Didcot (8 miles south-east), Bicester (15 miles north-east), Abingdon-on-Thames (3 miles south-east), Witney (9 miles north-west) and Carterton (12 miles west).
What’s near Henwood
Locally, jobs take us to homes and businesses close to Matthew Arnold School and The Bystander pub and the streets around them. For rail, the closest station is Oxford station, roughly 3.4 miles north-east of the centre. Well-known places in the area include Westgate Shopping Centre (3.5 miles north-east) and The Story Museum (3.6 miles north-east). The countryside around Henwood includes Cumnor Hill and Lashford Lane Fen.
Common problems we fix in Henwood
Every frame moves through the day. A plastic or aluminium frame lengthens in sunshine and shortens as it cools, while the masonry beside it stays put. If the sealant can’t stretch, it splits.
The problems people normally mention when they call are:
- Cracked internal joints between frame and plaster
- White mastic on grey or black frames
- Hard, cracked sealant around windows
- Gaps where the sill meets the wall
Managing a site like Wootton St Peter's Church of England Primary School? Then the mastic around its windows and doors needs looking after like any other building’s.
Questions to ask before you book
- What product goes in the joint
- How long the guarantee is
- What happens if the job turns out different
- How the surfaces are prepared before sealing