Oxfordshire · England
Window Mastic in Thame
Professional window mastic in and around Thame, with every bit of old sealant taken out first and a 12-month guarantee.
- Water coming in at the bottom corners of a door
- Gaps between the frame and the inside reveal
- Whistling draughts around closed windows
Can I do it myself?
If you’ve already had a go yourself, that is fine. We cut it out and start again, so just mention it when you contact us.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
About our window mastic in Thame
Frames and walls do not move together. Heat and cold make frames grow and shrink against brick or render that hardly moves. That is why the joint needs a flexible, low-modulus sealant rather than something rigid. If you have damp patches on the reveal after heavy rain and cold air getting in at the frame edge, we can help, whatever the surface.
Walls in Thame that face the prevailing wind take the most weather, and that is usually where the sealant gives up first. It’s worth looking at every frame, not just the one that leaks.
We stand behind the work with a 12-month guarantee, so you are not left on your own once the job is done.
- Location
- Thame (OX9)
- Region
- Oxfordshire
- Cover
- A year, on every job
- Quotes
- A clear price before work begins
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
What we’re called out for in Thame
Frames are never completely still. 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.
These are the problems we are asked about most:
- Gaps left after new windows were fitted
- Black, perished sealant on frames
- Sealant in the wrong colour for the frame
- Rain getting in at the frame or under the sill
In the older streets around Church of St Mary, the joint between an old wall and a newer frame is usually the first place rain gets in.
Before you book anyone
- Whether you can choose the colour
- How long to leave it before use
- Is the old sealant removed completely?
- How the surfaces are prepared before sealing
Why act early in Thame
A quick bead over the top of old mastic looks like an easy fix, but new sealant can’t bond to old, crumbling mastic. It peels before long, and water still gets in behind. The old mastic has to come out. In a family home in Thame, a failed seal around a bath or a frame lets water into places you cannot see, like the floor under a bath, the back of a panel or the inside of a wall. Left alone, that means rot, damp and a bigger repair.
Leaving a failed joint generally makes the job bigger, not smaller, because water and mould keep working on it. If you are not sure whether it needs doing, ring 0345 464 0079 or drop us an email and we will give you an honest view and a quote.
Why us?
- More than 20 years in sealant work
- We are fully insured
- 180+ five-star Google reviews
- Experience in homes, commercial sites and hotels
See our cost guide or customer reviews.
Thame: your questions answered
Is there a guarantee on window mastic in Thame?
Every job comes with our one-year guarantee, wherever it is. We are also fully insured and ARBOMaster approved.
Can you help a landlord with a rental near Haddenham & Thame Parkway station?
Yes. We work for landlords and agents as well as homeowners. Just call 0345 464 0079 or email us with the address and what needs doing, and we’ll send you a clear quote.
Is it OK to seal over old sealant?
No. Fresh sealant doesn’t stick to old sealant, and it traps any mould or water underneath. It all has to come out first.
Do you take out the old sealant first?
Yes, always, and completely. New silicone does not stick to old silicone, so the joint is cleaned back first.
Do you work on first-floor windows?
Yes, where they can be reached safely. Tell us about access when you get in touch so we can plan the job.
Will resealing my frames help with draughts?
Yes, where the draught is at the frame edge. We check where the draught is before any work starts.
Can I do it myself?
Some simple jobs can be done by a careful DIYer. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Do you cover Thame?
We do. Thame is part of the area we cover.
What happens on the day
Every visit runs the same way: we look at the joints together, mask and protect the surrounding surfaces, carry out the job and tidy away. Most jobs take a morning for a couple of windows and a door. For a job in Thame, we need access to where the work is and somewhere nearby to park. If the job is outside, mention gates, side access and anything above ground floor.
- First we look at every frame and agree the list.
- The old mastic is cut out and the surfaces cleaned back.
- 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.
Before we arrive
- Clear items away from the joints we’re working on
- Plan for the work area to be out of bounds to pets and children
- Let us know if you’ve seen damp or leaks
Ask for a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and add photos by email if you can.
Related advice
Landlord and commercial work in Thame
From a single let to a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a one-year guarantee.
For anyone letting property in or around Thame, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs, and photos by email help.
When it isn’t the sealant
We will not take on work that will not last, so here’s what sealant cannot put right:
- Worn gaskets, brush seals or a door that has dropped
- Faulty window hardware
- Condensation trapped between the panes
If in doubt, call 0345 464 0079 or send us an email and we will say what we think.
Joints and surfaces we work on
- Composite doors
- Timber windows & doors
- uPVC windows
- Window sills
- Aluminium frames
- Patio & French doors
Windows and doors in Thame
With historic houses such as Adwell House (about 3.9 miles south) nearby, there’s older building stock in the area around Thame as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Managing a site like Barley Hill Primary School? Then its window and door frames need their mastic kept sound, just like a home’s. If you let a flat or house near Haddenham & Thame Parkway station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Thame is about 8 miles south-west of Aylesbury, in Oxfordshire. For window mastic in and around Thame, it’s easy to get a quote: please call 0345 464 0079 or email us. We’re based in Crawley and cover Oxfordshire, Thame included. 443 places in Oxfordshire are on our list, from the larger towns to small villages. We also work in Oxford, about 11 miles from Thame.
Postcode districts we cover here for window mastic: OX9. Whether your property is on Upper High Street, Butter Market and High Street or anywhere close by, our applicators can take on the job. With the A329 and A418 close by, Thame is easy for our applicators to reach for window mastic. Neighbouring places we cover for window mastic include Moreton (1 mile south-west), Towersey (1 mile east), Kingsey (2 miles east), Long Crendon (2 miles north-west) and Haddenham (3 miles north-east). Further out, we also cover Oxford (11 miles west), Didcot (15 miles south-west), Bicester (13 miles north-west), Abingdon-on-Thames (14 miles west), Henley-on-Thames (15 miles south) and Kidlington (14 miles west). Thame is one of the larger places we cover in Oxfordshire.
Local landmarks in Thame
Typical jobs here are in homes near Lord Williams's School and Cross Keys Public House, among other places. For rail, the closest station is Haddenham & Thame Parkway station, about 2.1 miles north-east. Other landmarks nearby include Thame Museum (0.5 miles north-west) and Thame Community Hospital (within half a mile south-east). For a walk, there’s Snakemoor.
Also in Thame
Surface by surface
Aluminium frames
Aluminium needs a sealant that bonds to coated metal, and acetoxy silicones aren’t used, as they can attack some metals. We use a neutral-cure product.
Composite doors
Front doors take the weather head on. We pay most attention there.