Isle of Wight · England
Window & door mastic in Cranmore, Isle of Wight
Mastic around window and door frames, sills and patio doors in Cranmore, with a 12-month guarantee on every job. Ask us for a quote.
- Cracked sealant at the sill ends
- Old mastic that has gone black or come away
- Water coming in at the bottom corners of a door
How the visit works
All our tools and materials come with us in the van, so there’s nothing for you to buy. After a quick look at the joints together, we protect the area and start. It normally takes most of a day for a typical house, less for a few frames. In a small place like Cranmore, access is generally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We start by checking each window and door with you.
- Next the failed sealant is cut away and the joint cleaned.
- Deep gaps are filled with backing rod to set the depth.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- Every joint is checked before we leave.
Getting ready for the visit
- Mention any sign-in or site rules at work premises
- For indoor joints, keep the area dry beforehand if you can
- Clear items away from the joints we are working on
Ask for a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and email photos if that is easy.
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How we handle window mastic in Cranmore
There are two joints on most windows. The external joint is the weather seal; the internal joint closes the gap to the plaster and stops draughts. We seal one or both, depending on what’s needed. We work on composite doors, timber windows & doors and window sills, and people most often call us about black, perished sealant on frames and water coming in at the bottom corners of a door.
Homes in small places like Cranmore often stand in the open, with little to shelter their windows from wind and rain. That exposure dries out and cracks the mastic around frames and sills faster.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we will sort it.
- Place
- Cranmore (PO41)
- Wider area
- Isle of Wight
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
What affects the cost of window mastic
Jobs vary more than people expect. What affects the quote:
- Any mould that needs treating
- The old material and how stubborn it is
- Which sealant suits the joint
- Working hours on commercial sites
A failed joint rarely gets cheaper to fix by waiting. If you are unsure, phone 0345 464 0079 or drop us an email for an honest opinion and a quote.
What we need to know
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- Whether it has been sealed before
- A few photos by email, if you can
- Any access issues, like height or stairs
- The problem you’ve noticed
For a quote, call 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. We’ll send you a clear quote before any work starts.
Your questions about window mastic in Cranmore
Does living near the coast affect window mastic in Cranmore?
Coastal homes put outside sealant through more weather than inland ones, so the choice of sealant and the preparation matter even more. Walls facing the sea are generally the first to need attention.
Do you cover smaller places like Cranmore?
Yes, Cranmore is covered. Our work covers London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Do I need to be at home?
If the work is inside, we need someone to let us in. After that, you can carry on with your day.
What do you put in the joint?
Each joint gets the product that suits it. Where it moves, gets wet or faces the weather makes a difference, and we’ll tell you what we are using.
Do you have insurance?
Yes. Mr Mastic is fully insured.
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.
What does window mastic cost?
We do not publish prices, because the cost depends on the job: its size, the old material, access and the product needed. You’ll get a clear quote before we start.
Can you seal the gap between the frame and the plaster indoors?
Yes, we do both. Inside, the joint between frame and plaster is sealed neatly, using a paintable sealant if you want to decorate.
More services for Cranmore
Should I try it myself first?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
What window mastic looks like in Cranmore
Cranmore is within about 1 mile of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on the mastic around window and door frames, which can dry out and crack sooner where a building faces the weather. Historic houses like Swainston Manor (about 3.4 miles south-east) are a reminder that the area around Cranmore has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
For landlords with property near Lymington Pier station, renewing tired window mastic between tenants heads off draught and damp complaints. Historic houses such as Swainston Manor, about 3.4 miles south-east, show how far back building around Cranmore goes, and older homes nearby need a sealant that suits their walls.
Cranmore is about 6 miles south-east of Lymington, in the Isle of Wight. Across the PO41 area, our applicators can take on window mastic. 125 places in the Isle of Wight are on our list. Southampton is on our list too, around 14 miles away.
All of PO41 is covered for window mastic. We cover properties on Solent Road, East Close and Cranmore Avenue. We also cover the places around Cranmore: Hamstead (1 mile north-east), Shalfleet (1 mile south-east), Bouldnor (1 mile west), Yarmouth (2 miles west) and Thorns Beach (4 miles north). Larger places within reach include Newport (6 miles east), Ryde (12 miles east), Cowes (7 miles north-east), Sandown (13 miles east), Shanklin (13 miles south-east) and Ventnor (13 miles south-east). For island and remote addresses, the job takes a little more planning.
Local landmarks in Cranmore
The nearest railway station is Lymington Pier station, roughly 4.9 miles north-west of the centre. A little further out are Calbourne Water Mill And Rural Museum (2.6 miles south-east) and Yarmouth Castle (2.4 miles west). Green spaces nearby include Boldre Foreshore and Compton Down.
Do you need window mastic in Cranmore?
Joint shape matters as much as the product. A thin smear across a wide gap has nothing to it, and a gap filled solid can’t flex. Backing rod sets the right depth.
People usually contact us when they notice something like this:
- Hard, cracked sealant around windows
- Gaps where the sill meets the wall
- Old mastic that has gone black or come away
- Water coming in at the bottom corners of a door
Schools such as Shalfleet Church of England Primary School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s.
What your quote should include
- What product goes in the joint
- How long to leave it before use
- Whether you can choose the colour
- Who turns up on the day
What the job involves on each surface
Patio & French doors
Patio and French doors have the longest joints on most houses. The threshold and the bottom corners take the most water, so we pay close attention there.
Window sills
Stone and concrete sills have their own joints, including the one between the sill and the frame above. Those are sealed with a product suited to stone or concrete.
Keeping the joints in good condition
Looking after new joints is easy, and it makes a real difference:
- Check the mastic once a year
- Avoid harsh chemicals near the mastic
- Keep drainage slots and sill grooves clear
- Do not aim a pressure washer at the joints
Most silicone sealants will not take paint, so mention any painting plans before work begins. 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. Early resealing stops it reaching that point.
Leave it or put it right?
Not every sealant suits a window. Interior caulk and bathroom silicone aren’t made for exterior frame joints. An exterior, low-modulus sealant stays flexible in sun and frost. Where a wall is exposed, as many are in small places like Cranmore, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Homes and businesses are quoted the same way: 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 will go through it with you.
Why book with us
- White, clear, grey or another colour, product permitting
- ARBOMaster approved applicator
- More than 20 years in sealant work
- Neat joints and a tidy finish