Oxfordshire · England
Fernham Window Mastic
Window mastic for Fernham and the surrounding area: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Water coming in at the bottom corners of a door
- Mastic that has split away from the wall
- Draughty joints inside around the window
Window mastic in Fernham
A window frame and the wall around it expand and shrink at different rates. Plastic and aluminium frames move with the temperature, while masonry stays fairly still. So the sealant has to stretch and recover, which is why we use a low-modulus product. We work on composite doors, window sills and timber windows & doors, and common reasons people get in touch are sealant in the wrong colour for the frame and rushed sealant from a window installation.
In a village or hamlet like Fernham, older cottages and farmhouses often have timber windows set in stone or brick. Not every older frame suits a modern silicone bead, and sometimes a traditional sand mastic is the better choice.
Each job carries a 12-month guarantee.
- Location
- Fernham (SN7)
- Region
- Oxfordshire
- Guarantee
- 12 months on all our work
- Quote
- A clear price before work begins
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
FAQs for Fernham
Do you cover smaller places like Fernham?
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.
Do you cover Fernham for window mastic?
Yes. We work across London and the South East, and Fernham is part of that. Just call 0345 464 0079 or email us with a few details of the job, and we’ll send you a clear quote.
Should I try DIY first?
It depends on the job. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional, while a short indoor joint may be within reach.
Is the work guaranteed?
Yes. All our work carries a 12-month guarantee, and we’re fully insured.
Do you work for landlords and businesses?
Yes. Domestic, commercial and hotel work are all part of what we do, and we’re fully insured.
Can you seal over the old sealant?
No, it won’t last. It may look fine at first, but the new bead soon lifts. Removing the old sealant completely is the only lasting way.
Can you match the sealant to my frames?
Yes. We can use white, brown, anthracite grey, black or clear, so the joint suits the frame.
Do you seal inside as well as outside?
Yes. Indoors, we seal between the frame and the plaster or reveal, using a paintable sealant if you want to decorate.
Other services in Fernham
Landlords, agents and businesses in Fernham
We work for landlords and letting agents as well as homeowners. Sealant work between tenants keeps a property looking cared for.
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. We have worked in hotels as well as homes and businesses.
Window mastic in Fernham: local notes
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Historic houses like Buscot Park (about 4.3 miles north-west) are a reminder that the area around Fernham 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.
For an older house near a landmark such as Church of St John, frames set in older brick or stone need a sealant that suits the wall as well as the frame. For site and facilities teams at buildings such as Faringdon Community College, its window and door frames need their mastic kept sound, just like a home’s.
Fernham is about 7 miles west of Wantage, in Oxfordshire. Fernham gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Across Oxfordshire, we cover 443 places, and Fernham is one of them. There’s also a page for Oxford, about 17 miles away.
All of SN7 is covered for window mastic. That includes homes and businesses on High Street, Church Lane and The Green. Other places close to Fernham include Little Coxwell (1 mile north-west), Baulking (2 miles south-east), Uffington (2 miles south-east), Shellingford (2 miles north-east) and Faringdon (2 miles north). Further out, we also cover Didcot (14 miles east), Abingdon-on-Thames (13 miles east), Witney (12 miles north), Carterton (10 miles north), Wantage (7 miles east) and Grove (7 miles east).
Local landmarks in Fernham
A little further out are Faringdon Castle (2.4 miles north) and Uffington Museum (1.8 miles south). Open spaces near Fernham include Badbury Hill.
How the job changes by surface
Patio & French doors
Water at the foot of a door frame is not always the mastic: worn seals, blocked drainage slots or a poor threshold detail can be the cause. We check before we reseal.
Composite doors
Front doors take the weather head on. Those corners get the most care.
How we quote for window mastic
There’s no set price list, because jobs vary so much. The quote depends on:
- Any mould that needs treating
- When we can work, for business premises
- How many rooms, windows or areas are involved
- Whether old sealant or filler has to be cut out
Homes and businesses are quoted the same way: the amount of work, the access and the products needed. Ask us for a quote and we will go through it with you.
Asking for a quote
To help us quote quickly, let us know:
- Access, such as stairs, a lift or height
- Where the job is, and your postcode
- The type of property
- What the problem is, such as mould, gaps, leaks or cracking
Getting a quote is simple: let us know the job and the location, and roughly how big it is. A few pictures by email make the job easier to understand, and we’ll take it from there.
What happens on the day
There is not much for you to do on the day. Point us to the joints and we will get on with it. The job generally takes most of a day for a typical house, less for a few frames, including the tidy-up. Somewhere as small as Fernham, 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.
- We remove the old mastic and clean the frame edge and wall.
- Deep gaps get closed-cell backing rod to set the depth.
- 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.
How to prepare
- Keep pets and children clear of the area while we work
- Tell us about access, such as stairs, a lift or high-level joints
- Mention any parking rules near the property
How to get a quote
Want a quote for window mastic? Please call 0345 464 0079 or send us an email with a few details. We’ll explain what we’d do and give you a clear price before we start.
Read more
Should I try it myself first?
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
Looking after it afterwards
A little care helps the new joints last. Our advice:
- Walk round the house once a year and look at the joints
- Wipe condensation off the frames
- Wash the frames with mild soapy water
- Keep paint off silicone joints
Check the drainage slots in the frames are not blocked, so rain drains out rather than building up at the sealant.
Leaks usually show up in wet, windy weather, but sealant goes on best when frames and walls are dry. Sorting cracked mastic early means the joint is sound before the bad weather.
What we cannot put right
Honest advice matters more to us than a booking, so here’s what new sealant won’t do:
- A frame that has rotted at the joint
- Condensation trapped between the panes
- Damp problems in the wall away from the window
If you’re not sure, just phone 0345 464 0079 or drop us an email and we’ll give you a straight answer.
What we seal
- Timber windows & doors
- Aluminium frames
- Composite doors
- uPVC windows
- Patio & French doors
- Window sills