Hampshire · England
Headley Down Window Mastic
Mastic around window and door frames, sills and patio doors for householders, landlords and businesses in Headley Down. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Sealant in the wrong colour for the frame
- Whistling draughts around closed windows
- Gaps left after new windows were fitted
Work for landlords, hotels and businesses
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance that we can handle for you.
Landlords and letting agents in Headley Down can book us as well as homeowners. Resealing between tenancies is a simple way to keep a property in good order before the next move-in.
Window mastic in Headley Down
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 window sills, timber windows & doors and composite doors, and people most often call us about old mastic that has gone black or come away and gaps left after new windows were fitted.
Houses in smaller places like Headley Down can stand more in the open than those in a built-up town, so exposed windows and doors face the weather head on. The mastic around frames on those walls tends to age faster.
We stand behind the work with a 12-month guarantee, so you’re covered after we have gone.
- Where
- Headley Down (GU35)
- Region
- Hampshire
- Guarantee
- A year, on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Other services in Headley Down
What we are called out for in Headley Down
Older frames were often sealed with products that set hard. Once it has hardened, the frame’s movement tears it from the wall, leaving a hairline gap down one side.
The problems people normally mention when they call are:
- Whistling draughts around closed windows
- Untidy mastic left by window fitters
- Water coming in at the bottom corners of a door
- Sealant in the wrong colour for the frame
If you live in an older home near Church of All Saints, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Before booking anyone
- What the cure time is
- What happens if the job turns out different
- What product goes in the joint
- Are they insured?
Aftercare tips
So the new joints stay in good condition:
- Use gentle cleaners on frames and sealant
- Avoid harsh chemicals near the mastic
- Clear any debris from frame drain holes
- Check the mastic once a year
Most silicone sealants won’t take paint, so if you are planning to paint the frames or walls, tell us beforehand. We can use a paintable sealant where that matters.
A small gap around a frame only grows. As the old mastic shrinks further, more air gets through, and a cold room gets colder. Resealing closes it.
Windows and doors in Headley Down
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.
Letting a property close to Liphook station? Then sound mastic around windows and doors keeps out the draughts and damp that tenants notice first. Schools such as The Holme Church of England Primary School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s.
Headley Down is about 6 miles south of Farnham, in Hampshire. Across the GU35 area, we can carry out window mastic at your property. Across Hampshire, we cover 683 places, Headley Down among them. You can also see our page for Reading, about 24 miles away.
All of GU35 is covered for window mastic. Streets in the area include Wilsons Road, Ludshott Grove and Fairview Road. Main roads around Headley Down include the B3002. If you’re just outside Headley Down, we cover Arford (1 mile west), Headley (1 mile west), Wishanger Common (2 miles north), Standford (2 miles south-west) and Lindford (2 miles west). Further out, we also cover Farnborough (12 miles north), Fleet (11 miles north), Aldershot (9 miles north), Alton (8 miles west), Petersfield (10 miles south-west) and Yateley (15 miles north).
Local landmarks in Headley Down
Typical jobs here are in homes near Mill Chase Academy and the streets around them. For rail, the closest station is Liphook station, about 3.4 miles south. Well-known places in the area include Chase Community Hospital (2.8 miles west). Not far away are Gibbet Hill and Deadwater Valley.
What we can’t put right
Before booking, it’s worth knowing the limits too:
- Rotten timber, which needs a joiner first
- Penetrating damp from a failed cavity tray or render
- Misting between the panes of a double-glazed unit (that needs a new unit)
Not sure which it is? You can ring 0345 464 0079 or send us an email and we’ll tell you honestly.
Where we work in Headley Down
- Patio & French doors
- Timber windows & doors
- Window sills
- Aluminium frames
- Composite doors
- uPVC windows
How the job changes by surface
Composite doors
Draughts round the door leaf usually come from worn seals or adjustment, not the mastic. We’ll tell you if that’s what we find.
uPVC windows
We clean the frame edge carefully so the plastic is not marked, then the new bead is laid against the frame and the wall.
Why deal with it now?
Working on frames from a ladder with a sealant gun is not easy, especially upstairs. We cut out properly, back deep gaps and tool every joint neatly, using a product chosen for the frame and wall. In a smaller place like Headley Down, wherever a wall is exposed, a failed outside joint is a real source of damp. Inside, a split seal lets water into floors and panels just as it would anywhere.
Every job is a little different, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all make a difference, and we will explain the quote if you ask.
Why choose Mr Mastic in Headley Down
- Tidy, careful work
- Every job guaranteed for a year
- Any old sealant cut out fully, not covered over
- Sealant colour chosen to suit
Take a look at our cost guide or customer reviews.
How the visit works
Before we leave, we go over the finished joints with you. The work normally takes a morning for a couple of windows and a door, depending on the amount of work. For a job in Headley Down, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- We start by checking each window and door with you.
- The old mastic is cut out and the surfaces cleaned back.
- Deep gaps are filled with backing rod to set the depth.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- Finally we tidy up and check each joint.
How to prepare
- Tell us about any previous sealing or DIY attempts
- Let us know about parking restrictions
- Mention any leaks or damp you’ve noticed
Get a quote
Asking for a quote is easy: let us know the job and the location, and roughly how big it is. A few photos by email make the job easier to understand, and we will take it from there.
Advice
Headley Down: your questions answered
Will you come out to Headley Down?
Yes, we do. We work across London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
I let a flat near Liphook station. Can you help?
Yes, rental work is part of what we do. You can call 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before any work starts.
How many windows can you do in a day?
A few frames take a few hours, while a whole house takes longer. You’ll get a timescale with the quote.
Can I add another job to the visit?
Yes. Tell us about everything you’d like done and we will quote it together.
How long before the joint can be used?
Most sealants are touch-dry well before they’re fully cured. We’ll tell you how long to leave the joint before we leave.
Can you do the inside joint as well?
Yes. Draughts often come through the inside gap too, so sealing both is often worthwhile.
Can you seal over the old sealant?
No, because it fails. We remove every bit of old sealant first, so the new sealant bonds properly.
Where do you work from?
We are based in Crawley, West Sussex, and we work across South East England, London and Scotland.