Hampshire · England
Blendworth Window Mastic
Window and door frames in Blendworth need attention? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Mastic that is falling out in pieces
- Gaps between the frame and the inside reveal
- Cold air getting in at the frame edge
DIY sealant or a professional job?
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
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.
How we handle window mastic in Blendworth
Frames and walls do not move together. Plastic and aluminium frames move with the temperature, while masonry stays fairly still. So the sealant has to stretch and recover, which is why we use a low-modulus product. We’re often asked to deal with hard, cracked sealant around windows and cracked sealant at the sill ends, across window sills, composite doors and patio & French doors.
Outdoor sealant needs dry, clean surfaces, so work on frames around Blendworth is planned for dry weather. Tell us about access to every side of the house, including upper-floor windows.
Whatever the size of the job, you get the same 12-month guarantee in Blendworth and across Hampshire.
- Where
- Blendworth (PO8)
- Wider area
- Hampshire
- Cover
- A year, on every job
- Quotes
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Towns and villages near Blendworth
Also in Blendworth
What we cannot put right
Some problems need a builder, plumber or other trade rather than us:
- A failed sealed unit that has misted up
- A frame that has rotted at the joint
- Draughts through the window seals rather than the frame
Not sure which it is? You can call 0345 464 0079 or email us and we will tell you honestly.
Surfaces we seal
- Window sills
- Aluminium frames
- Patio & French doors
- uPVC windows
- Composite doors
- Timber windows & doors
How we quote for window mastic
Some jobs are bigger than they look, and some smaller. What affects the quote:
- Whether old sealant or filler has to be cut out
- Working hours on commercial sites
- The number and length of the joints
- Which sealant suits the joint
The cost reflects the work involved, not a rough estimate. That’s why we ask a few questions first and give you a clear price before work begins.
What we need to know
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
- If it’s domestic, commercial or a hotel
- Pictures of the joints, sent by email
- What’s wrong with the joints now
For window mastic in Blendworth, ring 0345 464 0079 or drop us an email. Tell us what the problem is and where, and you will get a clear quote before work begins.
What we do, step by step
Before we leave, we go over the finished joints with you and explain the cure time. The visit itself normally takes a morning for a couple of windows and a door, depending on the size of the job. Somewhere like Blendworth 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.
- First, we go round the frames with you and agree the list.
- We remove the old mastic and clean the frame edge and wall.
- Deep gaps get closed-cell backing rod to set the depth.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- We tool each bead neatly and check every joint is closed.
Before we arrive
- For business premises, tell us about site rules or sign-in
- Where the joints are inside, avoid wetting them before we arrive
- Mention any tricky access
How to get a quote
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is. Whenever you’re ready, call 0345 464 0079 or send us an email.
Advice
Common questions in Blendworth
Is Blendworth within the area you cover?
Yes, Blendworth is covered. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Is Blendworth in your area for window mastic?
Yes, Blendworth is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or email us with a few details of the job, and we’ll send you a clear quote.
Will the old sealant be removed?
Yes. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
Can landlords and businesses book you?
Yes, often. We can quote for several properties at once, and between tenancies is a good time for the work.
Do you do commercial work?
Yes. Hotels, offices and other businesses use us.
Is it worth trying it myself?
You can, for simple jobs. Preparation is everything: all the old sealant out, and a clean, dry joint. We can always put it right if it fails.
When is the sealant fully cured?
Different products cure at different speeds, so please follow the time we give you when we finish.
Can you do the inside joint as well?
Yes. Draughts often come through the inside gap too, so it can be worth sealing both.
Leave it or put it right?
The work is quick compared with the damage it prevents: it takes a morning for a couple of windows and a door. Leave it until water is coming in and you may need plastering and decorating as well. Where a wall is exposed, as many are in small places like Blendworth, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Combining jobs into one visit is normally more efficient than separate visits. We will give you a clear quote for the lot.
Why choose Mr Mastic in Blendworth
- Experience in homes, commercial sites and hotels
- A choice of colours where the product allows
- ARBOMaster approved applicator
- More than 20 years in sealant work
Common problems we fix in Blendworth
Every frame moves through the day. A plastic or aluminium frame lengthens in sunshine and shortens as it cools, while the brick or render around it hardly moves. If the sealant can’t stretch, it splits.
People normally contact us after spotting something like this:
- Hard, cracked sealant around windows
- Cold air getting in at the frame edge
- Rushed sealant from a window installation
- Black, perished sealant on frames
In the older streets around Church of the Holy Trinity, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
What your quote should include
- What guarantee comes with the work
- Whether they seal over old material or remove it
- Whether you can choose the colour
- Who does the work, and how experienced they are
Windows and doors in Blendworth
Historic houses like Uppark (about 4.8 miles north-east) are a reminder that the area around Blendworth 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’s traditional sand mastic. London and the South East are among 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 landlords with property near Rowlands Castle station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first. If you look after a building such as Horndean Church of England Junior School, the mastic around its windows and doors needs looking after like any other building’s.
Blendworth is about 1 mile north-east of Horndean, in Hampshire. From the centre of Blendworth to the outskirts, we cover window mastic for every kind of property. Across Hampshire, we cover 683 places, Blendworth among them. Our Portsmouth page covers work nearby, about 8 miles away.
Jobs for window mastic in PO8 is quoted and booked the same way as anywhere else. Neighbouring places we cover for window mastic include Chalton (2 miles north-east), Forestside (3 miles east), West Marden (4 miles east), Buriton (4 miles north) and Weston (5 miles north). Within a short drive, we also cover Gosport (11 miles south-west), Havant (4 miles south), Fareham (10 miles south-west), Hedge End (14 miles west), Waterlooville (3 miles south-west) and Petersfield (6 miles north).
Around Blendworth
We work in homes and buildings around Horndean Technology College and The Ship & Bell pub and the streets around them. The nearest railway station is Rowlands Castle station, about 2.1 miles south-east. Well-known places in the area include Havant War Memorial Hospital (4.3 miles south) and Clanfield Earthwork (2.1 miles north). Not far away are Windmill Hill.
Work for landlords, hotels and businesses
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. Several properties can be quoted together.