Hampshire · England
Window Mastic in New Copse
Window mastic in New Copse from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Mastic that’s falling out in pieces
- Cold air getting in at the frame edge
- Gaps between the frame and the inside reveal
How we quote for window mastic
Your quote is based on your job. We look at:
- The amount of work
- How easy the joints are to reach
- How much old sealant there is and how hard it is to remove
- How many rooms, windows or areas are involved
Doing several joints on one visit is normally more efficient than separate visits. You’ll get one clear quote for the whole job.
What we need to know
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- Any previous sealing or DIY work
- What the problem is, such as mould, gaps, leaks or cracking
- The rough size of the job
- Whether it’s a home or a business
For a quick quote, get us on the phone, or email us if that’s easier. Tell us about the joints that need doing and we’ll talk you through the work.
About our window mastic in New Copse
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. If you have water coming in at the bottom corners of a door and hard, cracked sealant around windows, we can put it right.
Outdoor sealant needs dry, clean surfaces, so work on frames around New Copse is planned for dry weather. Tell us about access to every side of the house, including upper-floor windows.
Big or small, it’s backed by our 12-month guarantee in New Copse and across Hampshire.
- Where
- New Copse (GU34)
- Wider area
- Hampshire
- Guarantee
- A year, on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Also near New Copse
Also in New Copse
How the visit works
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 any work begins. Most jobs take a few hours for a few frames, or a day or more for a whole house. Somewhere as small as New Copse, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We start by checking each window and door with you.
- 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.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- Every joint is checked before we leave.
Before we arrive
- Let us know about stairs, lifts or work at height
- Mention if the joints have been sealed before
- Try not to wet indoor joints just before the visit
Getting a quote
Asking for a quote is easy: tell us what needs doing and where and its rough size. Photos by email help us understand the job, and we’ll take it from there.
Advice
Work for landlords, hotels and businesses
Housing providers, facilities teams and property managers book us too in New Copse and across Hampshire. Several sites can be quoted together, and we are fully insured.
We work for landlords and agents as well as householders. Resealing between tenancies keeps a property looking cared for before the next move-in.
New Copse questions
I let a flat near Alton station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. Just phone 0345 464 0079 or send us an email with the address and what needs doing, and we’ll send you a clear quote.
Can you do window mastic in New Copse?
Yes, New Copse is within the area we cover. Our work covers London and the South East. You can phone 0345 464 0079 or send us an email and let us know what needs doing.
What do you put in the joint?
Each joint gets the product that suits it. Movement, water and weather all affect the choice, and we will tell you what we are using.
Can you match the sealant to my frames?
Yes, we choose a colour to suit the frame. Grey and black frames get grey or black sealant, and wood-effect frames generally suit brown.
Do you hold any approvals?
Yes. Mr Mastic is an ARBOMaster approved applicator and we are fully insured too.
Can you do the inside joint as well?
Yes. Indoors, we seal between the frame and the plaster or reveal, using a paintable sealant if you want to decorate.
Do you work on first-floor windows?
Yes, if safe access is possible. For high or awkward windows, we’ll tell you what access is needed.
Can new window sealant be painted?
Most silicone cannot be painted. Let us know beforehand, and we will use a paintable product where it suits.
What sealant work can’t fix
We’d rather tell you now than do work that will not last, so here’s what sealant cannot put right:
- Worn gaskets, brush seals or a door that has dropped
- Misting between the panes of a double-glazed unit (that needs a new unit)
- A frame that has rotted at the joint
If you are not sure, just phone 0345 464 0079 or email us and we’ll give you a straight answer.
Joints and surfaces we work on
- Aluminium frames
- Timber windows & doors
- Window sills
- Patio & French doors
- uPVC windows
- Composite doors
Why deal with it now?
The work is quick compared with the damage it prevents: it takes a few hours for a few frames, or a day or more for a whole house. Wait for damp to appear and there may be plaster and decorating to sort out too. Older cottages and farmhouses around New Copse can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
What it costs depends on the amount of work, how hard the old material is to remove and how easy the joints are to reach. We give a clear quote before we start, so you know where you stand.
Why book with us
- Tidy, careful work
- Full insurance on every job
- More than 20 years in sealant work
- Sealant colour chosen to suit
Take a look at what affects the cost or our reviews.
Frames and glazing around New Copse
Historic houses like Bentworth Hall (about 0.9 miles north-east) are a reminder that the area around New Copse has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. 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.
In the older streets around Church of St Andrew, the joint between an old wall and a newer frame is normally the first place rain gets in. Managing a site like Medstead Church of England Primary School? Then larger buildings have plenty of frames, and the mastic around each one ages.
New Copse is about 4 miles west of Alton, in Hampshire. If you need window mastic in New Copse, it’s easy to get a quote: please phone 0345 464 0079 or send us an email. We cover Hampshire from our Crawley base, New Copse included. Our Hampshire coverage runs to 683 places, and New Copse is one of them. There’s also a page for Southampton, roughly 21 miles from New Copse.
Here we cover the GU34 postcode area for window mastic. We also cover South Town (1 mile south), Holt End (1 mile north), Hattingley (1 mile south-west), Wivelrod (1 mile east) and Bentworth (1 mile north-east). Larger places within reach include Basingstoke (9 miles north), Winchester (12 miles south-west), Fleet (14 miles north-east), Aldershot (15 miles north-east), Alton (4 miles east) and Petersfield (11 miles south-east).
Local landmarks in New Copse
For rail, the closest station is Alton station, about 4.3 miles east. A little further out are Alton Community Hospital (3.2 miles east) and Gliding Heritage Centre (3.7 miles north-east). The countryside around New Copse includes King's Hill.
Do you need window mastic in New Copse?
Plenty of failed mastic was poorly applied in the first place. Mastic laid onto dusty, damp or crumbling surfaces didn’t grip properly, and it lets go sooner than it should.
People usually contact us after spotting something like this:
- Gaps where the sill meets the wall
- Mastic that has split away from the wall
- Untidy mastic left by window fitters
- Cold air getting in at the frame edge
Letting a property close to Alton station? Then renewing tired window mastic between tenants heads off draught and damp complaints.
What your quote should include
- Is VAT in the price?
- Who turns up on the day
- How hidden problems are handled
- What preparation is included
DIY sealant or a professional job?
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.