Hampshire · England
Window Mastic in Nashes Green
Mastic around window and door frames, sills and patio doors in Nashes Green, with a one-year guarantee on every job. Call for a quick quote.
- Gaps where the sill meets the wall
- Rain getting in at the frame or under the sill
- Untidy mastic left by window fitters
Aftercare tips
How long the joints last depends on use and care. We suggest:
- Ventilate rooms so frames do not stay wet inside
- Avoid harsh chemicals near the mastic
- Look round the frames every year or so
- Clean frames with a soft cloth and soapy water
Silicone can’t usually be painted, so mention any painting plans before we start. There are paintable sealants for joints that need it.
Water gets in quietly when mastic fails. Often the first sign is a damp patch inside or flaking paint on the reveal. Catching it early keeps the fix to a reseal.
Window mastic for homes and businesses in Nashes Green
If you can feel air around a shut window, the gap is often at the frame. A new joint stops the air getting through. Where the air is getting in through the window itself, we’ll say so. We are often asked to deal with draughty joints inside around the window and cracked or shrunken mastic around the frame, on timber windows & doors, patio & French doors and window sills.
Outdoor sealant needs dry, clean surfaces, so work on frames around Nashes Green is planned for dry weather. Let us know about access to all the frames, upstairs ones included.
You get a 12-month guarantee, the same in Nashes Green as everywhere else we work.
- Place
- Nashes Green (RG25)
- Wider area
- Hampshire
- Guarantee
- One year on every job
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Nearby places to Nashes Green
Other services in Nashes Green
How the job changes by surface
Patio & French doors
Not every patio door leak is a mastic problem: worn seals, blocked drainage slots or a poor threshold detail can be the cause. We look for the cause first.
Window sills
Stone and concrete sills have their own joints, and the joint under the frame can let rain run behind. Those are sealed with a product suited to stone or concrete.
DIY versus a professional finish
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
If you are set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it does not work out, we can still put it right.
How it works
We keep the work tidy and contained to the joints we are treating. Expect the work to take a few hours for a handful of frames, longer for a whole house, and we explain the cure time before we leave. For a village or hamlet like Nashes Green, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- First, we confirm safe access to each frame.
- Old, cracked mastic is removed completely.
- The surfaces are cleaned and left dry, and primed where the sealant calls for it.
- Deep voids are backed, then the sealant is gunned in.
- We tool the joint so water runs off, then clear up.
How to prepare
- On commercial sites, let us know about site rules
- Keep pets and children clear of the area while we work
- Mention if the joints have been sealed before
How to get a quote
Asking for a quote is easy: tell us what needs doing and where and its rough size. A few photos by email make the job easier to understand.
Advice
What we’re called out for in Nashes Green
Water runs down the glass onto the sill, so the sill ends and the joint below the frame are common leak points. When that sealant fails, water gets into the wall or under the frame.
The most common problems we see are:
- Old mastic that has gone black or come away
- Leaking joints at the ends of sills
- Rushed sealant from a window installation
- Draughty joints inside around the window
If you let a flat or house near Alton station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Before you book anyone
- When the joint can take water or movement
- Whether they’re fully insured
- What happens if they find a problem under the old sealant
- What preparation is included
Nashes Green: your questions answered
Do you cover Nashes Green for window mastic?
Yes, Nashes Green is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or drop us an email with a few details of the job.
Do you cover smaller places like Nashes Green?
Yes, Nashes Green is covered. 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.
How much does window mastic cost in Nashes Green?
There’s no set price, as it depends on the job: how much there is, what’s there now, how we reach it and what it needs. You will get a clear quote before any work starts.
How many windows can you do in a day?
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.
Where are you based?
Mr Mastic is based in Crawley. Our applicators cover Nashes Green, along with the rest of our area.
Can tenants book the work?
We can work for tenants, landlords or agents. Get your landlord’s agreement first.
Can you get sealant to suit coloured frames?
Yes. We can use white, brown, anthracite grey, black or clear, so the joint suits the frame.
Can you reach windows above the ground floor?
Yes, where it’s safe. For high or awkward windows, we will tell you what access is needed.
What affects the quote in Nashes Green
We don’t publish a price list. What we look at:
- Which sealant suits the joint
- Whether there’s mould to deal with
- Whether old sealant or filler has to be cut out
- The number and length of the joints
No two jobs are quite the same, so each one gets its own quote. Size, access and the product the joint needs all make a difference.
Helping us quote
To make quoting easier, let us know:
- Any previous sealing or DIY work
- Any access issues, like height or stairs
- Roughly how big the job is
- Where the property is
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is.
When something else is needed
Some problems need a builder, plumber or other trade rather than us:
- A door that needs adjusting, rehanging or new seals
- Damp problems in the wall away from the window
- A frame that has rotted at the joint
If in doubt, phone 0345 464 0079 or send us an email and we’ll say what we think.
Joints and surfaces we work on
- Aluminium frames
- uPVC windows
- Composite doors
- Window sills
- Patio & French doors
- Timber windows & doors
Nashes Green homes and the weather
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. Historic houses like Hall Place (about 3.3 miles south) are a reminder that the area around Nashes Green 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.
For an older house near a landmark such as Church of St. Mary, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Nashes Green is about 5 miles north-west of Alton, in Hampshire. Anywhere in RG25, we cover window mastic for homes and businesses. Across Hampshire, we cover 683 places, Nashes Green among them. Our Reading page covers work nearby (17 miles or so).
Here we cover the RG25 postcode area for window mastic. We also cover the places around Nashes Green: Ellisfield (2 miles west), Upton Grey (2 miles north-east), Upper Common (3 miles west), Cliddesden (3 miles north-west) and Viables (4 miles north-west). We also work in nearby towns such as Basingstoke (5 miles north-west), Farnborough (13 miles north-east), Fleet (10 miles north-east), Aldershot (12 miles east), Alton (5 miles south-east) and Petersfield (14 miles south).
Around Nashes Green
The closest station to Nashes Green is Alton station, roughly 4.7 miles south-east of the centre. Nearby you’ll also find Gliding Heritage Centre (1.4 miles south-east) and Basing House (4.6 miles north). For a walk, there’s Holybourne Hill.