Isle of Wight · England
Window & door mastic in Northwood, Isle of Wight
Window mastic across Northwood and nearby, with every bit of old sealant taken out first and a one-year guarantee.
- Untidy mastic left by window fitters
- Sealant in the wrong colour for the frame
- Draughty joints inside around the window
Window mastic in Northwood, done properly
Every window and door frame has a gap around it, and mastic is what closes it. Once that seal fails, wind and rain find the gap. The old mastic is removed and the joint resealed with a flexible exterior sealant. Common call-outs are for mastic that has split away from the wall and white mastic on grey or black frames, on window sills, composite doors and uPVC windows.
Mastic can only go onto a dry, clean joint, so window work in Northwood is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Where
- Northwood (PO31)
- Wider area
- Isle of Wight
- Cover
- A year, on every job
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Northwood questions
Do you cover smaller places like Northwood?
Yes. Northwood is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Do you cover Northwood for window mastic?
Yes. We work across London and the South East, and Northwood is part of that. Just call 0345 464 0079 or send us an email with a few details of the job, and we will give you a clear price.
Do I have to be there?
Access is agreed with you when the job is booked. Indoors, that generally means someone at home.
How many windows can you do in a day?
A handful of frames is a short visit, while a whole house takes longer. We confirm the timing with your quote.
Can resealing stop a draught around my window?
Often, yes. Air often gets in between the frame and the wall, and sealing the inside and outside joints closes that path.
What does window mastic cost?
Size, access and the old material all affect the cost. Ask us for a quote and we’ll talk you through it.
Do you take out the old sealant first?
Yes, always, and completely. New silicone doesn’t stick to old silicone, so any old material comes out before anything new goes in.
Do you work for landlords and businesses?
Yes, regularly. Several properties can be quoted together.
What happens on the day
When we arrive, we start by going over the job with you, so there are no surprises. We protect the surfaces around the joints before we start. Most jobs take a few hours for a few frames, or a day or more for a whole house. Somewhere as small as Northwood, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- 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.
- New exterior sealant goes on in a matching colour and is tooled smooth.
- We clear up and check every joint is fully closed.
How to prepare
- Let us know about stairs, lifts or work at height
- Keep pets and children clear of the area while we work
- Mention any sign-in or site rules at work premises
How to get a quote
There’s no standard price list, because every job is different. Instead, we give you a clear price for your job. To arrange one, call 0345 464 0079 or email us.
Related advice
What sealant work cannot fix
We’d rather tell you now than do work that won’t last, so here’s what sealant can’t put right:
- Rotten timber, which needs a joiner first
- A door that needs adjusting, rehanging or new seals
- Faulty window hardware
Not sure which it is? You can phone 0345 464 0079 or email us and we will tell you honestly before booking.
What we seal
- Patio & French doors
- Composite doors
- uPVC windows
- Aluminium frames
- Window sills
- Timber windows & doors
What the job involves on each surface
Composite doors
A composite door usually sits in a plastic outer frame, so its perimeter joint is sealed much like a window. We match the colour to the frame.
Aluminium frames
Aluminium needs a sealant that bonds to coated metal. We use a neutral-cure product.
Why act early in Northwood
Running fresh sealant over the old joint is tempting, but it will not grip old, dirty sealant. It soon lifts and the leak carries on behind it. Proper resealing starts with removing the old joint. Around Northwood, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
Why book with us
- A 12-month guarantee on all work
- 180+ five-star Google reviews
- 20+ years of sealant experience
- White, clear, grey or another colour, product permitting
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Keep timber frames painted
- Look round the frames every year or so
- Do not use solvent cleaners on the joint
- Clear any debris from frame drain holes
Clean the frames with mild soapy water, and avoid solvent cleaners on the sealant.
Leaks normally show up in wet, windy weather, but resealing works best in dry conditions. Dealing with it when you first notice a crack avoids chasing leaks through the wet months.
DIY versus a professional finish
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
Also near Northwood
Also in Northwood
Northwood homes and the weather
Northwood is within about 2 miles of the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. That’s hard on the mastic around window and door frames, especially on the side facing the sea. Historic houses like Osborne House (about 2 miles east) are a reminder that the area around Northwood 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.
Homes close to All Saints' Church include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Managing a site like Northwood Primary School? Then its window and door frames need their mastic kept sound, just like a home’s.
Northwood is about 1 mile south of Cowes, in the Isle of Wight. We provide window mastic to householders, landlords and businesses in Northwood and nearby, as part of our work across the Isle of Wight. Northwood is one of 125 places in the Isle of Wight where we work for window mastic. We also work in Portsmouth, around 11 miles away.
We cover every part of PO31 for window mastic. That includes homes and businesses on Nodes Road, Wyatts Lane and Uplands Road. Other places close to Northwood include Rew Street (1 mile west), Gurnard (1 mile north), Cowes (1 mile north), Noke Common (2 miles south) and Parkhurst (2 miles south). Further out, we also cover Newport (3 miles south), Ryde (7 miles east), Sandown (9 miles south-east), Shanklin (10 miles south-east), Ventnor (11 miles south-east) and Oakfield (7 miles east). If you are somewhere remote, the job takes a little more planning, so mention it when you ask for a quote.
Landmarks near Northwood
Typical jobs here are in homes near Cowes Enterprise College and The Travellers Joy pub and the streets around them. Nearby you’ll also find Isle of Wight Natural History Centre (0.5 miles north) and West Cowes Castle (1.7 miles north). Green spaces nearby include Mill Hill and Briddlesford Nature Reserve.
What affects the cost of window mastic
We quote each job individually. This is what makes a difference:
- How much old sealant there is and how hard it is to remove
- The number of rooms or windows
- Working hours on commercial sites
- Access and height
Leaving a failed joint normally makes the job bigger, not smaller. If you are unsure, phone 0345 464 0079 or drop us an email and we’ll give you an honest view and a quote.
Helping us quote
Photos help, but a description is a good start. Try to tell us:
- Pictures of the joints, sent by email
- Roughly how big the job is
- The problem you’ve noticed
- Where the property is
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is.