Hampshire · England
Oakhanger Window Mastic
Mastic around window and door frames, sills and patio doors in Oakhanger, with a one-year guarantee on every job. Call for a quick quote.
- Mastic that has split away from the wall
- Cracked internal joints between frame and plaster
- Mastic that’s falling out in pieces
DIY versus a professional finish
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.
If you do try it yourself, take your time over the 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.
Window mastic for homes and businesses in Oakhanger
Homes in Oakhanger have every kind of window: uPVC, aluminium, timber and composite, plus patio doors, French doors and sills. Each gets a sealant chosen for the frame and the wall it meets. We work on timber windows & doors, uPVC windows and composite doors, and common reasons people get in touch are gaps left after new windows were fitted and mastic that’s falling out in pieces.
Homes in small places like Oakhanger often stand in the open, with little to shelter their windows from wind and rain. Exposed frames and sills lose their mastic sooner than sheltered ones.
Whatever the size of the job, it’s backed by our one-year guarantee in Oakhanger and across Hampshire.
- Place
- Oakhanger (GU35)
- Wider area
- Hampshire
- Guarantee
- 12 months on all our work
- Quotes
- A clear price before work begins
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Aftercare tips
Simple care keeps the joints in good condition. We recommend:
- Paint up to the joint, not over it
- Do not use solvent cleaners on the joint
- Air rooms to keep condensation down around windows
- Repaint timber before it’s bare
Silicone cannot generally be painted, so mention any painting plans before any work starts. There are paintable sealants for joints that need it.
Look out for the warning signs: cracks in the mastic, gaps you can see light through, damp on the reveal or mould around the inside of the frame. If you notice one, it’s time to get the joint looked at.
Signs you need window mastic in Oakhanger
Frames are never completely still. Sun on a frame makes it expand, and it contracts again overnight, while the brick or render around it hardly moves. If the sealant cannot stretch, it splits.
Keep an eye out for these signs:
- Water coming in at the bottom corners of a door
- Sealant in the wrong colour for the frame
- Rushed sealant from a window installation
- Black, perished sealant on frames
Letting a property close to Alton station? Then sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Questions to ask before booking
- What happens if the job turns out different
- How long to leave it before use
- How the surfaces are prepared before sealing
- What insurance they hold
Oakhanger questions
Can you do window mastic in Oakhanger?
Yes. Our work covers London and the South East, and Oakhanger is part of that. You can call 0345 464 0079 or email us and let us know what needs doing.
Is Oakhanger within the area you cover?
Yes, we do. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Will it make a mess?
We keep the work tidy. Nearby surfaces are protected.
I rent my home. Can I book you?
Yes. Ask your landlord first, and we can send them the quote if that helps.
What should I tell you?
The location, the problem and the rough size of the job. Photos by email help too.
How long should I leave it?
It depends on the product and the temperature. We tell you how long to leave it before we go.
Do you take out the old sealant first?
Yes. All of the old material is cut out and the joint cleaned before resealing.
Can resealing stop a draught around my window?
Yes, if the air is getting in around the frame. If it’s through the window’s own seals or a hinge, that is a different fix, and we’ll say so.
For landlords and businesses
Housing providers, facilities teams and property managers book us too. Several sites can go on one quote, and we’re fully insured for the work.
Hotels need rooms back in use, so the work can be planned room by room. We have worked in hotels as well as homes and businesses.
Why deal with it now?
Once mastic fails, rain can get between the frame and the wall. Over time that can mean damp patches, damaged plaster and rotting timber. A reseal is a much smaller job. In a small place like Oakhanger, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote and we will talk you through it.
Why book with us
- Anti-fungal silicone where joints get wet
- Rated 4.9 stars on Google
- Approved under the ARBOMaster scheme
- Homes, businesses and hotels
See what affects the cost and customer reviews.
Different surfaces, different methods
Patio & French doors
Water at the foot of a door frame is not always the mastic: blocked drain slots, worn brush seals and threshold details can let water in too. We look for the cause first.
Composite doors
If the door itself is draughty, the issue may be the door seals or hinges rather than the frame mastic. We’ll tell you if that’s what we find.
What window mastic looks like in Oakhanger
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you live in an older home near St Mary Magdalene's Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. Managing a site like Mill Chase Academy? Then the mastic around its windows and doors needs looking after like any other building’s.
Oakhanger is about 4 miles south-east of Alton, in Hampshire. For window mastic in and around Oakhanger, please phone 0345 464 0079 or send us an email for a quick quote. We cover Hampshire from our Crawley base, Oakhanger included. We cover 683 towns and villages across Hampshire. You can also see our page for Portsmouth, about 23 miles away.
Postcode districts we cover here for window mastic: GU35. Neighbouring places we cover for window mastic include Hartley Mauditt (2 miles west), East Worldham (2 miles north-west), Wyck (3 miles north), Upper Farringdon (3 miles west) and Neatham (4 miles north-west). Larger places within reach include Basingstoke (13 miles north-west), Farnborough (14 miles north-east), Fleet (11 miles north), Horndean (15 miles south), Aldershot (11 miles north-east) and Alton (4 miles north-west).
What’s near Oakhanger
The nearest railway station is Alton station, roughly 3.8 miles north-west. Well-known places in the area include The Romany Museum (2.1 miles south-west) and Chase Community Hospital (1.9 miles east). Open spaces near Oakhanger include Selborne Hill and Deadwater Valley.
What happens on the day
There is not much for you to do on the day. Show us the job and we’ll take it from there. The job generally takes anything from an hour or two to a full day, depending on how many frames there are. Somewhere like Oakhanger needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- First we look at every frame and agree the list.
- We remove the old mastic and clean the frame and the wall.
- We fit backing rod in deep gaps so the sealant is the right depth.
- New exterior sealant goes on in a matching colour and is tooled smooth.
- We clear up and check every joint is fully closed.
Preparing for the visit
- Tell us if parking is tricky
- Try not to wet indoor joints just before the visit
- For business premises, tell us about site rules or sign-in
How to get a quote
We quote each job on its own, so the first step is telling us about yours. Just call 0345 464 0079 or email us with the details.