Hampshire · England
Window & door mastic in High Cross, Hampshire
Window mastic for High Cross, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Gaps between the frame and the inside reveal
- Old mastic that has gone black or come away
- Leaking joints at the ends of sills
Different surfaces, different methods
uPVC windows
uPVC expands and contracts noticeably with temperature, so we use a flexible, low-modulus sealant. We match white, brown, anthracite grey and black frames.
Window sills
Every drop off the glass ends up on the sill, so the sill ends and the joint under the frame are vital. Each is cleaned out and resealed.
How we handle window mastic in High Cross
The new joint doesn’t have to be white. White, brown, anthracite grey, black and clear sealants are all available, so the line suits the frame instead of standing out. We are often asked to deal with draughts coming in around windows and doors and sealant in the wrong colour for the frame, on patio & French doors, window sills and aluminium frames.
Somewhere as small as High Cross, older homes often have timber frames set in stone or brickwork. Older buildings like these do not always suit modern silicone, and sometimes a traditional sand mastic is the better choice.
All our work comes with our one-year guarantee, wherever you are in Hampshire.
- Location
- High Cross (GU32)
- Region
- Hampshire
- Guarantee
- 12 months on all our work
- Quotes
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Work for landlords, hotels and businesses
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a one-year guarantee.
Housing providers, facilities teams and property managers book us too in High Cross and across Hampshire. We can quote a run of properties together.
Can I do it myself?
The biggest DIY mistake is sealing over old sealant. New silicone won’t bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly.
The process
The work is kept neat and contained to the joints we are treating. Expect the work to take anything from an hour or two to a full day, depending on how many frames there are. In a small place like High Cross, access is normally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First, we go round the frames with you and agree the list.
- The old mastic is cut out and scraped back to clean surfaces.
- Where the gap is deep, backing rod goes in first.
- A flexible exterior sealant is applied in a colour to suit the frame.
- We tool each bead neatly and check every joint is closed.
Getting ready for the visit
- Plan for the work area to be out of bounds to pets and children
- Mention any tricky access
- Let us know about parking restrictions
Get a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll talk you through what we’d do. When it suits you, phone 0345 464 0079 or drop us an email.
Related advice
High Cross questions
Do you work for landlords with property near Petersfield station?
Yes, landlords and agents are among the people we work for. Just ring 0345 464 0079 or email us with the address and what needs doing, and we’ll give you a clear price.
Do you cover High Cross for window mastic?
Yes. We work across London and the South East, and High Cross is part of that. Just ring 0345 464 0079 or drop us an email with a few details of the job.
Can you match the sealant to my frames?
Usually, yes. Mention the frame colour when you ask for a quote and we will match it as closely as we can.
Can you do several jobs on one visit?
Yes. Tell us about everything you’d like done.
Can resealing stop a draught around my window?
If the draught is coming in around the frame, yes. If it’s coming through the window seals, we will tell you.
Are you ARBOMaster approved?
Yes. Mr Mastic is an ARBOMaster approved applicator.
How do I get a quote for window mastic in High Cross?
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 work begins.
Will the old sealant be removed?
Yes. All of the old material is cut out and the joint cleaned before resealing.
Aftercare tips
Good habits help new joints last longer. Our tips:
- Look round the frames every year or so
- Make sure the drainage slots aren’t blocked
- Don’t use solvent cleaners on the joint
- Keep paint off silicone joints
Try not to touch the new joint while it cures, following the cure time we give you. Don’t point a pressure washer at the joints.
A small gap around a frame only grows. As old mastic keeps shrinking, the gap widens, and a cold room gets colder. Resealing closes it.
What window mastic looks like in High Cross
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 site and facilities teams at buildings such as Froxfield Church of England Primary School, the mastic around its windows and doors needs looking after like any other building’s. If you live in an older home near Church of St Peter, frames set in older brick or stone need a sealant that suits the wall as well as the frame. Letting a property close to Petersfield station? Then cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
High Cross is about 3 miles north-west of Petersfield, in Hampshire. We carry out window mastic for homes and businesses in High Cross, as part of our work across Hampshire. 683 places in Hampshire are on our list. Portsmouth is on our list too, around 16 miles away.
Jobs for window mastic in GU32 works the same way as everywhere else we cover. We cover properties on High Cross Lane, Dellfield and Deans Dell and the roads around them. We also cover the places around High Cross: Froxfield Green (1 mile south-west), Oakshott (2 miles north-east), Langrish (2 miles south), Stroud (2 miles south) and Steep (2 miles east). Further out, we also cover Winchester (15 miles west), Havant (12 miles south), Horndean (9 miles south), Alton (8 miles north), Waterlooville (11 miles south) and Petersfield (3 miles south-east).
Around High Cross
The closest station to High Cross is Petersfield station, roughly 2.6 miles south-east. Other landmarks nearby include Petersfield Community Hospital (2.7 miles south-east) and Bear Museum (3.1 miles south-east). The countryside around High Cross includes Wheatham Hill and Liss Riverside Railway Walk South.
What we cannot put right
A few problems are outside what sealant work can do:
- Damp problems in the wall away from the window
- Broken hinges, locks or handles
- Draughts through the window seals rather than the frame
Not sure which it is? You can call 0345 464 0079 or send us an email and we’ll tell you honestly.
Surfaces we seal
- Composite doors
- Aluminium frames
- uPVC windows
- Window sills
- Patio & French doors
- Timber windows & doors
Why act early in High Cross
A cracked joint around a frame lets rain into the wall. Left long enough, it can stain inside walls, spoil plaster and rot wooden frames. Resealing now is a small job by comparison. Older cottages and farmhouses around High Cross can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
Combining jobs into one visit is normally more efficient than separate visits, so it’s worth mentioning everything you’d like done. You will get one clear quote for the whole job.
Why High Cross customers choose us
- You choose the colour before work begins
- 20+ years of sealant experience
- Fully insured
- Domestic, commercial and hotel work
See our cost guide or customer reviews.