Hampshire · England
Window & door mastic in Newtown, Hampshire
Mastic around window and door frames, sills and patio doors for homes and businesses in Newtown and across Hampshire. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Mastic that’s falling out in pieces
- Untidy mastic left by window fitters
- Water coming in at the bottom corners of a door
What we do, step by step
Most of a good job is in the preparation, so that is where we spend the time. Joints are cleaned back and dried before anything new goes in. All told, the work takes a few hours for a few frames, or a day or more for a whole house. Somewhere as small as Newtown, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We start by checking each window and door with you.
- 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.
- Finally we tidy up and check each joint.
Before we arrive
- Move anything stored near the joints
- On commercial sites, let us know about site rules
- Tell us about access, such as stairs, a lift or high-level joints
Ask for a quote
We quote each job on its own, so start by telling us what you need. Just ring 0345 464 0079 or email us with the details, and pictures are welcome.
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About our window mastic in Newtown
Colour matters on a frame. We can seal in white, brown, anthracite grey, black or clear, so the bead blends with the window rather than framing it. We work on window sills, timber windows & doors and aluminium frames, and people most often call us about whistling draughts around closed windows and old mastic that has gone black or come away.
Mastic can only go onto a dry, clean joint, so window work in Newtown is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
Big or small, you get the same 12-month guarantee.
- Location
- Newtown (PO17)
- Region
- Hampshire
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Places near Newtown
What else we do in Newtown
What we can’t put right
We won’t take on work that won’t last, so here’s what sealant can’t put right:
- Misting between the panes of a double-glazed unit (that needs a new unit)
- Soft or decayed wood in the frame
- Damp coming through the wall itself rather than the frame joint
If you’re not sure, just call 0345 464 0079 or drop us an email and we’ll give you a straight answer before booking.
Surfaces we seal
- Timber windows & doors
- Window sills
- Patio & French doors
- Aluminium frames
- uPVC windows
- Composite doors
Frames and glazing around Newtown
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Rented homes near Portchester station change hands often, and renewing tired window mastic between tenants heads off draught and damp complaints. If you look after a building such as Newtown Soberton Infant School, its window and door frames need their mastic kept sound, just like a home’s. For an older house near a landmark such as Church of the Holy Trinity, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Newtown is about 5 miles north-west of Waterlooville, in Hampshire. Newtown gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. Our area takes in 683 places across Hampshire, from the larger towns to small villages. Portsmouth is on our list too, about 8 miles from Newtown.
Postcode districts we cover here for window mastic: PO17. Whether your property is on Church Road, Hundred Acres Road and Ingoldfield Lane or a nearby road, our applicators can take on the job. Neighbouring places we cover for window mastic include Southend (1 mile north-east), Soberton Heath (1 mile north), Hoe Gate (1 mile east), Hipley (1 mile south-east) and Woodend (1 mile north-west). Further out, we also cover Winchester (13 miles north-west), Gosport (8 miles south), Havant (7 miles south-east), Eastleigh (10 miles west), Fareham (5 miles south-west) and Horndean (5 miles east).
Landmarks near Newtown
In Newtown, that means homes and buildings near The Bold Forester Public House, among other places. Newtown’s nearest station is Portchester station, roughly 4.4 miles south. Well-known places in the area include Knowle Hospital (3.8 miles south-west). Not far away are St Clair's Meadow and Portsdown Hill.
What affects the cost of window mastic
We do not publish a price list, because jobs vary so much. What we look at:
- Whether old sealant or filler has to be cut out
- How easy the joints are to reach
- Any mould that needs treating
- The number of rooms or windows
What you pay reflects the work, not a rough estimate. That is why we ask a few questions first and agree the price before starting.
Helping us quote
When you call or email, these details help:
- The problem you’ve noticed
- Pictures of the joints, sent by email
- Where the property is
- If someone has resealed it before
It all starts with a short chat. Describe the problem, the location and the size of the job, and we’ll talk you through what we’d do. When it suits you, phone 0345 464 0079 or email us.
Newtown questions
Is Newtown within the area you cover?
Yes, Newtown is covered. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Do you work for landlords with property near Portchester station?
Yes. We work for landlords and agents as well as householders, and several properties can be quoted together. Just ring 0345 464 0079 or email us with the address and what needs doing, and we will send you a clear quote.
Is the new sealant paintable?
That depends on the product. Some hybrid sealants can be painted; silicone cannot. Tell us if you are decorating and we will choose accordingly.
Will it make a mess?
Very little: the area around the joints is protected first, and we clear up the old sealant and our materials before we leave.
Are you insured?
Yes. We are fully insured.
Can you match the sealant to my frames?
Yes. White, brown, anthracite grey, black and clear sealants are all available.
Do you seal inside as well as outside?
Yes. Inside, the joint between frame and plaster is sealed neatly.
Will there be a smell?
It depends on the product. Some products have a noticeable smell, others very little, and any smell fades as they cure.
DIY versus a professional finish
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
Looking after it afterwards
Simple care keeps the joints in good condition. Our advice:
- Repaint timber before it’s bare
- Avoid blasting the frames with a pressure washer
- Don’t paint over the silicone
- Ventilate rooms so frames don’t stay wet inside
Keep sill grooves and drainage slots clear, so water can run away instead of sitting against the joint.
A failed joint lets water into the wall a little at a time. You might not see it until plaster blows or a damp patch appears inside. Early resealing stops it reaching that point.
Surface by surface
Window sills
Sills catch the water running down the glass, so the joints at each end and underneath matter. They’re cut out and resealed with exterior sealant.
Composite doors
Draughts round the door leaf usually come from worn seals or adjustment, not the mastic. We seal the frame and let you know about anything else.
Why it’s worth doing now in Newtown
If you’re painting or rendering, reseal at the same time. Fresh joints finish the job neatly, and it’s easier while the walls are being worked on anyway. Around Newtown, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
Combining jobs into one visit is usually more efficient than separate visits, so it’s worth mentioning everything you’d like done. We’ll give you a clear quote for the lot.
Why us?
- We’re fully insured
- Colour agreed with you before any work starts
- Domestic, commercial and hotel work
- Anti-fungal silicone where joints get wet