Oxfordshire · England
Longcot Window Mastic
We cover Longcot for mastic around window and door frames, sills and patio doors. Old material cut out, joints cleaned and sealed neatly and a one-year guarantee.
- Mastic that’s falling out in pieces
- Draughts coming in around windows and doors
- A bead that does not match the frame
How we handle window mastic in Longcot
The new joint does not have to be white. We can seal in white, brown, anthracite grey, black or clear, so the bead blends with the window rather than framing it. If you are dealing with old mastic that has gone black or come away and hard, cracked sealant around windows, we can help, whatever the surface.
In a village or hamlet like Longcot, older cottages and farmhouses often have timber windows set in stone or brick. Older buildings like these don’t always suit modern silicone, so the sealant has to be chosen to suit the building.
Each job carries a 12-month guarantee.
- Where
- Longcot (SN7)
- Region
- Oxfordshire
- Cover
- 12 months on all our work
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
The process
On the day, we start by going over the job with you, so you know exactly what we’re doing. We protect the surfaces around the joints before any work begins. Most jobs take a few hours for a handful of frames, longer for a whole house. In a small place like Longcot, access is usually the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We start by checking each window and door with you.
- 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.
- Every joint is checked before we leave.
Preparing for the visit
- Tell us about access, such as stairs, a lift or high-level joints
- Tell us if parking is tricky
- Plan for the work area to be out of bounds to pets and children
Get a quote
To get a quote, ring 0345 464 0079 or email us and tell us where the job is and what the problem looks like. We’ll give you a clear quote before any work starts.
Advice
Why it’s worth doing now in Longcot
Getting a straight, even bead on an outside frame takes practice, especially upstairs. We cut out properly, back deep gaps and tool every joint neatly, in a sealant suited to the wall. Where a wall is exposed, as many are in small places like Longcot, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Combining jobs into one visit is generally more efficient than separate visits, so tell us about everything that needs sealing. We’ll give you a clear quote for the lot.
Why book with us
- Over 20 years’ experience
- Domestic, commercial and hotel work
- Anti-fungal silicone where joints get wet
- 12-month guarantee on every job
Take a look at our cost guide or our reviews.
Frames and glazing around Longcot
The South East is one of 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 Buscot Park (about 4.1 miles north-west) are a reminder that the area around Longcot 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.
In the older streets around Church of St Mary, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Schools such as Longcot and Fernham Church of England Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
Longcot is in Oxfordshire. Homes, rented property, offices and hotels in Longcot can book us for window mastic, old or new, large or small. The work is guaranteed for a year. Across Oxfordshire, we cover 443 places, Longcot among them. Our Oxford page covers work nearby, about 19 miles away.
Jobs for window mastic in SN7 is quoted and booked the same way as anywhere else. Window mastic is available to properties on The Green, Church Close and Hughes Crescent and the roads around them. If you are just outside Longcot, we cover Fernham (1 mile north-east), Little Coxwell (2 miles north), Great Coxwell (2 miles north), Woolstone (2 miles south-east) and Uffington (2 miles south-east). Within a short drive, we also cover Abingdon-on-Thames (15 miles east), Witney (13 miles north-east), Carterton (10 miles north), Wantage (8 miles east), Grove (8 miles east) and Faringdon (3 miles north).
Local landmarks in Longcot
Locally, jobs take us to homes and businesses close to Bricklayers Arms and Faringdon Community College, among other places. Nearby you’ll also find Faringdon Day Hospital (2.9 miles north) and Uffington Museum (2.1 miles south-east). Green spaces nearby include Badbury Hill.
Honest limits
Before you book, it’s worth knowing the limits too:
- Penetrating damp from a failed cavity tray or render
- Faulty window hardware
- Misting between the panes of a double-glazed unit (that needs a new unit)
Not sure which it is? You can call 0345 464 0079 or email us and we will tell you honestly.
Joints and surfaces we work on
- Composite doors
- uPVC windows
- Patio & French doors
- Window sills
- Timber windows & doors
- Aluminium frames
Looking after it afterwards
No joint lasts for ever, but care makes a real difference. Our tips:
- Avoid harsh chemicals near the mastic
- Keep timber frames painted
- Clear any debris from frame drain holes
- Keep paint off silicone joints
Most silicone sealants won’t take paint, so if you’re planning to paint the frames or walls, tell us beforehand. There are paintable sealants for joints that need it.
Look out for the warning signs: split or missing mastic, gaps, damp patches inside or black mould on the reveal. Any of these is worth a call.
Surface by surface
Composite doors
Composite doors are normally hung in an uPVC-type frame, and the joint around it is sealed like a window. We match the colour to the frame.
Timber windows & doors
Where timber has rotted at the joint, it needs repairing first. We will point out any rot we find, as a joiner will need to deal with it.
Quotes for window mastic in Longcot
Some jobs are bigger than they look, and some smaller. The main factors:
- How many areas need sealing
- Mould in or behind the old joints
- The type of sealant required
- Working hours on commercial sites
The cost reflects the work involved, not guesswork. That’s why we ask about the job first and agree the price before starting.
Asking for a quote
Photos help, but a description is a good start. Please mention:
- The address or postcode of the job
- How we’d reach the joints
- What’s wrong with the joints now
- Whether it’s a home or a business
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we will talk you through the work and give you a clear quote.
Longcot: your questions answered
Is Longcot in your area for window mastic?
Yes, Longcot is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or drop us an email and let us know what needs doing.
Is there a guarantee on window mastic in Longcot?
Every job comes with our 12-month guarantee, wherever it is. We’re fully insured, and an ARBOMaster approved applicator.
Can you get sealant to suit coloured frames?
Yes, we choose a colour to suit the frame. Grey and black frames get grey or black sealant, and wood-effect frames normally suit brown.
Should I try DIY first?
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.
When is the sealant fully cured?
Cure times vary by product. We tell you how long to leave it before we go.
Can new window sealant be painted?
Silicone generally won’t take paint. If you plan to paint, tell us first and we can use a paintable sealant where it suits the joint.
Will there be a smell?
That depends on the sealant. Some products have a noticeable smell, others very little.
What should I tell you?
The location, the problem and the rough size of the job. Photos by email help too.
Towns and villages near Longcot
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Can I do it myself?
If you’re set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it does not work out, we can still put it right.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.