Hampshire · England
Kentsboro Window Mastic
Specialist window mastic for Kentsboro: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Untidy mastic left by window fitters
- Rain getting in at the frame or under the sill
- Mastic that is falling out in pieces
Different surfaces, different methods
Timber windows & doors
On period timber windows, traditional sand mastic is sometimes the better choice. We will tell you which suits your home.
Window sills
Stone and concrete sills have their own joints, including the one between the sill and the frame above. We seal those with a sealant suited to masonry.
How we handle window mastic in Kentsboro
Most frames have an outside joint and an inside one. The external joint is the weather seal; inside, the joint between frame and plaster stops draughts and tidies the reveal. Either or both can be done. We work on patio & French doors, timber windows & doors and window sills, and common reasons people get in touch are cracked sealant at the sill ends and rushed sealant from a window installation.
Around Kentsboro, many homes face open ground, so their windows and doors take the full weather. Exposed frames and sills lose their mastic sooner than sheltered ones.
You get a 12-month guarantee, the same in Kentsboro as everywhere else we work.
- Location
- Kentsboro (SO20)
- Wider area
- Hampshire
- Guarantee
- One year on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
FAQs for Kentsboro
I let a flat near Grateley station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can ring 0345 464 0079 or drop us an email with the details for a clear quote.
Is Kentsboro in your area for window mastic?
Yes, Kentsboro is within the area we cover. Our work covers 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 price.
What does window mastic cost?
We do not publish prices, because the cost depends on the job: how much there is, what’s there now, how we reach it and what it needs.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.
Can you match the sealant to my frames?
Yes. We can use white, brown, anthracite grey, black or clear, so the joint suits the frame.
Can new sealant go over the old?
No. The old sealant always comes out first, so the new sealant bonds properly.
How long before the joint can be used?
Most sealants are touch-dry well before they’re fully cured. We’ll give you the cure time for the product we used before we leave.
Is the work guaranteed?
Yes. Each job is covered for 12 months, inside or out.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. Our applicators cover Kentsboro.
Why act early in Kentsboro
Working on frames from a ladder with a sealant gun isn’t easy, especially upstairs. We cut out properly, back deep gaps and tool every joint neatly, in a sealant suited to the wall. Around Kentsboro, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
The cost depends on the amount of work, how hard the old material is to remove and access to the work. You will have a clear quote before any work starts, so you know where you stand.
Why book with us
- Fully insured
- Homes, businesses and hotels
- An ARBOMaster approved applicator
- A sealant colour to suit the surroundings
What we do, step by step
On the day, we look over the joints with you first, so you know exactly what we’re doing. We protect the surfaces around the joints before any work begins. The work generally takes most of a day for a typical house, less for a few frames. Somewhere as small as Kentsboro, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- 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.
- A flexible exterior sealant is applied in a colour to suit the frame.
- Every joint is tooled smooth and checked before we leave.
Preparing for the visit
- Try not to wet indoor joints just before the visit
- Clear the area around the work
- On commercial sites, let us know about site rules
How to get a quote
Need a quote? Please phone 0345 464 0079 or send us an email and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.
Advice
Frames and glazing around Kentsboro
The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Letting a property close to Grateley station? Then sound mastic around windows and doors keeps out the draughts and damp that tenants notice first. In and around Kentsboro, as anywhere, good window mastic starts with a clean, dry, properly prepared joint.
Kentsboro is about 5 miles south-west of Andover, in Hampshire. Our applicators cover window mastic for householders, landlords and businesses in Kentsboro, as part of our work across Hampshire. Kentsboro is one of 683 towns and villages in Hampshire where we work. We also work in Southampton, about 18 miles from Kentsboro.
We work across SO20 for window mastic and the streets around it. That includes homes and businesses on Mead Park Square, Upper Mead and Lower Mead and the roads around them. Other places close to Kentsboro include Over Wallop (2 miles south-west), Middle Wallop (2 miles south-west), Nether Wallop (2 miles south), Fox (2 miles north) and Red Rice (2 miles north-east). We also work in nearby towns such as Winchester (13 miles south-east), Andover (5 miles north-east), Chandler's Ford (14 miles south-east), Romsey (12 miles south), Hyde (12 miles south-east) and Tidworth (7 miles north-west).
Near you in Kentsboro
For rail, the closest station is Grateley station, about 2.6 miles west of the centre. A little further out are Andover War Memorial Hospital (5 miles north-east). For a walk, there’s Quarley Hill and Mill Lake.
Aftercare tips
Good habits help new joints last longer. A few tips:
- Make sure the drainage slots aren’t blocked
- Air rooms to keep condensation down around windows
- Walk round the house once a year and look at the joints
- Don’t paint over the silicone
On timber frames, keep the paintwork in good order, because bare, wet timber moves more and pulls at the joint. Paint up to the joint, not over the silicone.
A small gap around a frame only grows. As old mastic keeps shrinking, the gap widens, and a cold room gets colder. A new joint closes it up.
For landlords and businesses
We work for landlords and letting agents as well as homeowners. Sealant work between tenants keeps a property looking cared for before the next move-in.
Letting agents often deal with us directly. Tell us the address, the job and how access works and we will quote.
When it isn’t the sealant
Before you book, it’s worth knowing the limits:
- Broken hinges, locks or handles
- Rotten timber, which needs a joiner first
- Damp coming through the wall itself rather than the frame joint
If you are not sure, just ring 0345 464 0079 or drop us an email and we will give you a straight answer.
What we seal
- uPVC windows
- Timber windows & doors
- Aluminium frames
- Patio & French doors
- Window sills
- Composite doors
Nearby places to Kentsboro
Other services in Kentsboro
Can I do it myself?
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
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 doesn’t work out, we can still put it right.