Isle of Wight · England
Window Mastic in Forest Side
Mastic around window and door frames, sills and patio doors for homes and businesses in Forest Side and across the Isle of Wight. Fully insured, ARBOMaster approved and guaranteed for a year.
- Cracked sealant at the sill ends
- Draughty joints inside around the window
- Mastic that has split away from the wall
Window mastic in Forest Side, done properly
The mastic around a window or door seals the gap between the frame and the wall. Once that seal fails, wind and rain find the gap. Our applicators cut it out and replace it with a flexible, weatherproof sealant. We work on composite doors, window sills and uPVC windows, and common reasons people get in touch are cold air getting in at the frame edge and draughty joints inside around the window.
In a village or hamlet like Forest Side, older cottages and farmhouses often have timber windows set in stone or brick. Not every older frame suits a modern silicone bead, so the sealant has to be chosen to suit the building.
We stand behind the work with a 12-month guarantee.
- Place
- Forest Side (PO30)
- Wider area
- Isle of Wight
- Guarantee
- A year, on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
What we can’t put right
In fairness, some problems need a different trade:
- Broken hinges, locks or handles
- Condensation trapped between the panes
- Worn gaskets, brush seals or a door that has dropped
If you’re not sure, just call 0345 464 0079 or email us and we’ll give you a straight answer.
Surfaces we seal
- Composite doors
- uPVC windows
- Patio & French doors
- Timber windows & doors
- Aluminium frames
- Window sills
Keeping the joints in good condition
So the new joints stay in good condition:
- Wash the frames with mild soapy water
- Check the mastic once a year
- Avoid blasting the frames with a pressure washer
- Avoid harsh chemicals near the mastic
Clean the frames with mild soapy water, and keep solvents and harsh chemicals off the joint.
On timber windows, water behind the joint can lead to rot. Rotten timber needs a joiner, not a sealant, so early resealing is worth it.
Why it’s worth doing now in Forest Side
Draughts and leaks don’t always mean new windows. If the frames and glass are in good order, resealing the joints is often all that’s needed. Problems with the glass or gaskets are for a window company, and we will say so. Around Forest Side, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
Why choose Mr Mastic in Forest Side
- Anti-fungal sanitary silicone in wet areas
- We agree the colour with you first
- One-year guarantee on every job
- An ARBOMaster approved applicator
Read our cost guide or what customers say.
When to call us in Forest Side
Every frame moves through the day. A plastic or aluminium frame lengthens in sunshine and shortens as it cools, while the masonry beside it stays put. If the sealant can’t stretch, it splits.
Look out for any of the following:
- Hard, cracked sealant around windows
- Gaps between the frame and the inside reveal
- Rain getting in at the frame or under the sill
- White mastic on grey or black frames
For site and facilities teams at buildings such as Carisbrooke College, its window and door frames need their mastic kept sound, just like a home’s.
Before you book anyone
- How the colour is chosen
- How hidden problems are handled
- What product goes in the joint
- What preparation is included
Questions from Forest Side
Can you do window mastic in Forest Side?
Yes, Forest Side is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or drop us an email with a few details of the job, and we will give you a clear quote.
Is Forest Side within the area you cover?
Yes. Forest Side is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Are you an approved applicator?
Yes. We are an ARBOMaster approved applicator.
Is it messy?
Tidy work is part of the job. Nearby surfaces are protected, and the area is left clean when we finish.
What does window mastic cost?
We don’t publish prices, because the cost depends on the job: its size, the old material, access and the product needed. You will get a clear quote before any work starts.
Can you work on commercial sites?
Yes. We’ve worked for hotels, offices and other businesses.
Can new window sealant be painted?
Most silicone can’t be painted. If you plan to paint, tell us first and we can use a paintable sealant where it suits the joint.
What information do you need?
Only a few details: the address or postcode, what’s wrong and any access issues. Then call 0345 464 0079 or send us an email.
Towns and villages near Forest Side
More services for Forest Side
What window mastic looks like in Forest Side
With historic houses such as Carisbrooke Castle (about 1.3 miles south) nearby, there’s older building stock in the area around Forest Side as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For an older house near a landmark such as St. Mary's Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Forest Side is about 1 mile north-west of Newport, in the Isle of Wight. Every kind of property in Forest Side is covered for window mastic, old or new, large or small. The work is guaranteed for a year. We cover 125 towns and villages across the Isle of Wight, from the larger towns to small villages. There’s also a page for Portsmouth, roughly 13 miles from Forest Side.
Jobs for window mastic in PO30 works the same way as everywhere else we cover. We cover properties on Forest Road and Gunville Road and the roads around them. Close by, we work in Hunny Hill (1 mile east), Parkhurst (1 mile north-east), Noke Common (1 mile north-east), Porchfield (2 miles north-west) and Locksgreen (2 miles west). Further out, we also cover Ryde (7 miles east), Cowes (4 miles north), Sandown (8 miles south-east), Shanklin (8 miles south-east), Ventnor (9 miles south-east) and East Cowes (4 miles north-east). Island and remote addresses take a little more planning, so please mention your location when you ring 0345 464 0079 or send us an email.
Landmarks near Forest Side
Around Forest Side, our work takes us to homes and buildings near Hunnyhill Primary School, Seaclose Park and Island Innovation VI Form Campus and the streets around them. A little further out are Carisbrooke Castle (1.3 miles south) and St Mary's Hospital (1 mile east). For a walk, there’s Mill Hill and Briddlesford Nature Reserve.
What affects the cost of window mastic
Every job gets its own quote. This is what makes a difference:
- The number and length of the joints
- Any working-time requirements on site
- Whether old sealant or filler has to be cut out
- Whether the work is at height
Leaving a failed joint usually makes the job bigger, not smaller, because water and mould keep working on it. If you are unsure, ring 0345 464 0079 or email us and we’ll give you an honest view and a quote.
Helping us quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- Roughly how big the job is
- How we’d reach the joints
- Where the property is
- Photos by email, if that’s easy
To get a quote, ring 0345 464 0079 or email us with the location and a short description of the problem. We’ll give you a clear price before any work starts.
Different surfaces, different methods
Composite doors
If the door itself is draughty, the issue may be the door seals or hinges rather than the frame mastic. We’ll tell you if that’s what we find.
Timber windows & doors
On period timber windows, traditional sand mastic is sometimes the better choice. We can talk through the options.
How it works
There is not much for you to do on the day. Point us to the joints and we’ll get on with it. The job generally takes most of a day for a typical house, less for a few frames from start to finish. Somewhere like Forest Side needs a little journey planning: 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.
- We check each frame and agree which ones need doing.
- We remove the old mastic and clean the frame and the wall.
- Deep gaps are filled with backing rod to set the depth.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- Every joint is checked before we leave.
Getting ready for the visit
- Let us know about earlier repairs to the joints
- Keep pets and children clear of the area while we work
- Mention any parking rules near the property
Ask for a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job. When it suits you, call 0345 464 0079 or email us.