Hampshire · England
Window Mastic in Northbrook
Window and door frames in Northbrook need attention? We remove the old material, prepare the joints and seal them properly, with a 12-month guarantee.
- Damp patches on the reveal after heavy rain
- Gaps where the sill meets the wall
- Gaps between the frame and the inside reveal
About our window mastic in Northbrook
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. We’re often asked to deal with old mastic that has gone black or come away and damp patches on the reveal after heavy rain, on uPVC windows, composite doors and patio & French doors.
Somewhere as small as Northbrook, older homes often have timber frames set in stone or brickwork. Older buildings like these don’t always suit modern silicone, and sometimes a traditional sand mastic is the better choice.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we will sort it.
- Place
- Northbrook (SO21)
- Region
- Hampshire
- Guarantee
- 12 months on all our work
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Should I try it myself first?
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
What we’re called out for in Northbrook
On timber frames, paint and putty build up around the joint. Mastic painted over many times cracks with the paint, and the wood moves with damp as well as heat.
If you can see any of these, it’s time to have the joints looked at:
- Damp patches on the reveal after heavy rain
- Gaps between the frame and the inside reveal
- Hard, cracked sealant around windows
- Untidy mastic left by window fitters
Managing a site like Micheldever CofE Primary School? Then the mastic around its windows and doors needs looking after like any other building’s.
Before you book anyone
- Whether they seal over old material or remove it
- Who does the work, and how experienced they are
- Is VAT in the price?
- What product goes in the joint
How it works
At the end, we look at the finished work together and explain the cure time. The work normally takes a few hours for a handful of frames, longer for a whole house, depending on the size of the job. Somewhere as small as Northbrook, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We check how each frame can be reached safely.
- All the failed sealant is cut away.
- Frame and wall are cleaned and must be dry before sealing.
- Backing rod fills deep voids and the sealant goes in on top.
- We tool the joint so water runs off, then clear up.
Before we arrive
- For indoor joints, keep the area dry beforehand if you can
- Mention any sign-in or site rules at work premises
- Keep children and pets away from the work area
How to get a quote
We don’t publish a price list, because every job is different. Instead, we send you a clear quote for your job. To arrange one, ring 0345 464 0079 or send us an email.
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Northbrook: your questions answered
Do you cover Northbrook for window mastic?
Yes, Northbrook is within the area we cover. Our work covers London and the South East. Just ring 0345 464 0079 or send us an email with a few details of the job.
Do you work for landlords with property near Micheldever station?
Yes. We work for landlords and letting agents as well as homeowners. You can phone 0345 464 0079 or drop us an email with the details for a clear quote.
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.
Can I paint over the new sealant?
That depends on the product. Silicone is not paintable, but some hybrid sealants are. Mention any painting plans before any work starts.
When is the sealant fully cured?
Most sealants are touch-dry well before they’re fully cured. We’ll tell you how long to leave the joint.
Can you do the inside joint as well?
Yes. Draughts often come through the inside gap too, so it can be worth sealing both.
How long will my window job take?
Allow a few hours for a few frames, or a day or more for a whole house. Access and how stubborn the old mastic is affect the time most.
Are you ARBOMaster approved?
Yes. We’re approved under the ARBOMaster scheme, which is run for the Arbo sealant brand.
What we cannot put right
Some problems need a builder, plumber or other trade rather than us:
- Soft or decayed wood in the frame
- A failed sealed unit that has misted up
- Faulty window hardware
If in doubt, call 0345 464 0079 or send us an email and we’ll say what we think before you book.
What we seal
- Composite doors
- Aluminium frames
- Window sills
- Timber windows & doors
- uPVC windows
- Patio & French doors
Leave it or put it right?
A quick bead over the top of old mastic looks like an easy fix, but it won’t grip old, dirty sealant. It soon lifts and the leak carries on behind it. The old mastic has to come out. In a small place like Northbrook, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
The cost reflects the work involved, not guesswork. That is why we ask a few questions first and agree the price before starting.
Why Northbrook customers choose us
- Tidy, careful work
- You choose the colour before work begins
- Rated 4.9 stars on Google
- One-year guarantee on every job
Take a look at what affects the cost or customer reviews.
What affects the quote in Northbrook
For a quick quote, just ask. What matters most is:
- The old material and how stubborn it is
- The number of rooms or windows
- Whether the work is at height
- Whether there’s mould to deal with
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, along with when we can work on site. Ask us for a quote and we’ll go through it with you.
Helping us quote
To make quoting easier, let us know:
- A few pictures by email, if you can
- If someone has resealed it before
- The type of property
- What’s wrong with the joints now
For window mastic in Northbrook, phone 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and you will get a clear quote before work begins.
Northbrook homes and the weather
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For landlords with property near Micheldever station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. In the older streets around Church of St Mary, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Northbrook is about 7 miles north of Winchester, in Hampshire. Northbrook gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Our Hampshire coverage runs to 683 places, Northbrook among them. You can also see our page for Southampton, about 17 miles away.
Jobs for window mastic in SO21 is quoted and booked the same way as anywhere else. Close by, we work in Micheldever (1 mile south-east), Stoke Charity (1 mile west), Hunton (2 miles west), Micheldever Station (2 miles north) and East Stratton (2 miles east). We also work in nearby towns such as Basingstoke (11 miles north-east), Winchester (7 miles south), Eastleigh (13 miles south), Andover (10 miles north-west), Chandler's Ford (13 miles south-west) and Alton (13 miles east).
Near you in Northbrook
We work in homes and buildings around Half Moon and Spread Eagle pub. For rail, the closest station is Micheldever station, about 2.1 miles north.
For landlords and businesses
We work for letting agents and landlords as well as homeowners. Sealant work between tenants is a simple way to keep a property in good order.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.