Oxfordshire · England
Window & door mastic in Longworth, Oxfordshire
Mastic around window and door frames, sills and patio doors for Longworth, backed by a one-year guarantee. Ask us for a quote.
- Rain getting in at the frame or under the sill
- Sealant in the wrong colour for the frame
- Cracked sealant at the sill ends
Window mastic for homes and businesses in Longworth
A window frame and the wall around it expand and shrink at different rates. Heat and cold make frames grow and shrink against brick or render that hardly moves. That’s why the joint needs a flexible, low-modulus sealant rather than something rigid. If you are dealing with draughty joints inside around the window and damp patches on the reveal after heavy rain, we can put it right.
Around Longworth, many homes face open ground, so their windows and doors take the full weather. Exposed frames and sills lose their mastic sooner than sheltered ones.
Every job comes with our one-year guarantee.
- Place
- Longworth (OX13)
- Wider area
- Oxfordshire
- Guarantee
- One year on every job
- Quote
- A clear price before work begins
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Common problems we fix in Longworth
Joint shape matters as much as the product. A skim of sealant over a wide gap soon tears, and a gap filled solid cannot flex. That’s what backing rod is for.
Common reasons people contact us are:
- Black, perished sealant on frames
- Draughty joints inside around the window
- Mastic that has split away from the wall
- A bead that doesn’t match the frame
Homes close to Church of St Mary include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Comparing quotes
- What happens if they find a problem under the old sealant
- Whether you can choose the colour
- How the surfaces are prepared before sealing
- Whether VAT is included
Towns and villages near Longworth
What else we do in Longworth
When it is not the sealant
It helps to know what we cannot do:
- A door that needs adjusting, rehanging or new seals
- Soft or decayed wood in the frame
- A failed sealed unit that has misted up
Not sure which it is? You can call 0345 464 0079 or send us an email and we will tell you honestly.
Joints and surfaces we work on
- Aluminium frames
- Window sills
- Composite doors
- Patio & French doors
- uPVC windows
- Timber windows & doors
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 neat, narrow bead in a colour to match suits the frame.
Looking after it afterwards
To keep the joints looking good and working properly:
- Avoid blasting the frames with a pressure washer
- Avoid harsh chemicals near the mastic
- Wash the frames with mild soapy water
- Walk round the house once a year and look at the joints
Keep sill grooves and drainage slots clear, so rain drains out rather than building up at the sealant.
A failed joint lets water into the wall a little at a time. You might not see it until plaster blows or a damp patch appears inside. Early resealing stops it reaching that point.
Landlord and commercial work in Longworth
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance.
Letting agents often deal with us directly. Tell us the address, the job and how access works and we’ll quote.
What happens on the day
Most of a good job is in the preparation, and we do not rush it. Every joint is cleaned and dried before new material goes in. All told, the work takes a few hours for a handful of frames, longer for a whole house. In a small place like Longworth, access is usually the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- 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.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- We tool each bead neatly and check every joint is closed.
Before we arrive
- Clear items away from the joints we are working on
- Let us know about parking restrictions
- Plan for the work area to be out of bounds to pets and children
Get a quote
Want a quote for window mastic? Please phone 0345 464 0079 or email us with a few details. We will explain what we’d do and send you a clear quote before we start.
Related advice
DIY versus a professional finish
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Longworth: your questions answered
Is window mastic in Longworth guaranteed?
Every job comes with our one-year guarantee, wherever it is. We’re also fully insured and ARBOMaster approved.
Do you cover smaller places like Longworth?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Is it OK to seal over old sealant?
No. Fresh sealant does not stick to old sealant, and anything trapped underneath, including mould and water, stays there. It all has to come out first.
Can you do the inside joint as well?
Yes. Plenty of draughts come through the inside joint as well as the outside, so sealing both is often worthwhile.
What does window mastic cost?
We do not publish prices, because the cost depends on the job: how much there is, what’s there now, how we reach it and what it needs. You will get a clear quote before work begins.
How long before the joint can be used?
Most sealants are touch-dry well before they’re fully cured. We will give you the cure time for the product we used.
Can you do upstairs windows?
Yes, in most cases. Access is planned before work begins, so mention the height and anything in the way.
Do you take out the old sealant first?
Yes, always, and completely. New sealant won’t bond properly to old, so the joint is cleaned back first.
Windows and doors in Longworth
With historic houses such as Longworth House (about 0.4 miles west) nearby, there’s older building stock in the area around Longworth as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For site and facilities teams at buildings such as Longworth Primary School, its window and door frames need their mastic kept sound, just like a home’s.
Longworth is about 7 miles west of Abingdon-on-Thames, in Oxfordshire. Every kind of property in Longworth can book us for window mastic, old or new, large or small. The work is guaranteed for a year. Our Oxfordshire coverage runs to 443 places, and Longworth is one of them. You can also see our page for Oxford, about 10 miles away.
All of OX13 is within our area for window mastic. That includes homes and businesses on High Street, Bowbank and Rectory Lane and the roads around them. We also cover the places around Longworth: Hinton Waldrist (1 mile west), Kingston Bagpuize (1 mile south-east), Pusey (3 miles south-west), Charney Bassett (3 miles south) and Lyford (3 miles south). Further out, we also cover Oxford (10 miles north-east), Didcot (10 miles south-east), Abingdon-on-Thames (7 miles east), Witney (7 miles north), Carterton (8 miles north-west) and Wantage (7 miles south).
Local landmarks in Longworth
Typical jobs here are in homes near Waggon And Horses Public House and the streets around them. Other landmarks nearby include Hinton Waldrist Castle (0.8 miles west). The countryside around Longworth includes Hitchcopse Pit.