Hampshire · England
Sand mastic for sash & case windows in Oakhanger, Hampshire
Sand mastic for Oakhanger, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Gaps where the frame meets the masonry
- Window mastic to renew ahead of painting
- Draughts and rain around sash boxes
About our sand mastic in Oakhanger
Sand mastic is the traditional way to point the gap between a timber window frame and the stone or brick around it. It’s a mix of sand and a linseed-oil-based binder and built up by hand. On period homes, it looks right where silicone wouldn’t. We work on brick reveals, tenement windows and period & listed homes, and people most often call us about failed mastic on an exposed elevation and patchy fillers round a sash window.
Homes in small places like Oakhanger often stand in the open, with little to shelter their windows from wind and rain. Exposed frames and sills lose their mastic sooner than sheltered ones.
A one-year guarantee comes as standard.
- Place
- Oakhanger (GU35)
- Region
- Hampshire
- Cover
- A year, on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
How it works
A visit follows a simple pattern: we look at the joints together, mask and protect the surrounding surfaces, do the work and clear up. Most jobs take anything from a few hours to a full day, depending on how many windows. Somewhere as small as Oakhanger, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We start by checking each surround and agreeing the joints to renew.
- We rake out the old mastic and clean the joint.
- Deep voids are packed so the mastic is the right thickness.
- The mastic is mixed, pressed into the joint by hand and shaped.
- The finish is dressed so it sits neatly against the stone or brick.
Getting ready for the visit
- Try not to wet indoor joints just before the visit
- On commercial sites, let us know about site rules
- Clear the area around the work
How to get a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we will talk you through what we’d do. When it suits you, phone 0345 464 0079 or drop us an email.
Advice
Windows and doors in Oakhanger
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For an older house near a landmark such as St Mary Magdalene's Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Letting a property close to Alton station? Then any sash windows need sound mastic to keep draughts and rain out.
Oakhanger is about 4 miles south-east of Alton, in Hampshire. Oakhanger gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a 12-month guarantee. We cover 683 towns and villages across Hampshire. Our Portsmouth page covers work nearby (23 miles or so).
Jobs for sand mastic in GU35 is quoted and booked the same way as anywhere else. We also cover Hartley Mauditt (2 miles west), East Worldham (2 miles north-west), Wyck (3 miles north), Upper Farringdon (3 miles west) and Neatham (4 miles north-west). Further out, we also cover Basingstoke (13 miles north-west), Farnborough (14 miles north-east), Fleet (11 miles north), Horndean (15 miles south), Aldershot (11 miles north-east) and Alton (4 miles north-west).
Landmarks near Oakhanger
Oakhanger’s nearest station is Alton station, about 3.8 miles north-west. Nearby you’ll also find The Romany Museum (2.1 miles south-west) and Chase Community Hospital (1.9 miles east). The countryside around Oakhanger includes Selborne Hill and Deadwater Valley.
Keeping the joints in good condition
No joint lasts for ever, but care makes a real difference. A few tips:
- Check with your local planning authority if your home is listed
- Go gently near the mastic when preparing windows
- Ask a joiner to look at soft timber first
- Plan mastic work ahead of painting
Leave the new mastic alone while it firms up. It forms a skin fairly soon, but takes longer to harden fully.
It’s best to renew mastic before painting the windows. Paint over cracked mastic only covers it up.
Towns and villages near Oakhanger
What else we do in Oakhanger
Leave it or put it right?
Not every filler suits an old window surround. Sand mastic matches what was there, which can matter on listed and conservation-area homes. Where a wall is exposed, as many are in small places like Oakhanger, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
The cost reflects the work involved, not a rough estimate. That’s why we ask about the job first.
Why us?
- Rated 4.9 stars on Google
- Approved under the ARBOMaster scheme
- A 12-month guarantee on all work
- Any old sealant cut out fully, not covered over
See what affects the cost and our reviews.
Surface by surface
Timber door frames
A neat sand mastic joint round a front door suits a period home.
Period and listed homes
Many older homes were built with sand mastic round the windows. If your home is listed, ask your local planning authority about consent.
Do you need sand mastic in Oakhanger?
Decorating can disturb tired mastic. Many people find it crumbling when they prepare the windows.
Common reasons people contact us include:
- Mastic dropping out of the joint
- Silicone on a period window that looks wrong
- Window mastic to renew ahead of painting
- Gaps round a timber door in stone or brick
For site and facilities teams at buildings such as Mill Chase Academy, its window and door frames need their mastic kept sound, just like a home’s.
Comparing quotes
- Whether VAT is included
- What guarantee comes with the work
- How long to leave it before use
- Whether the sealant suits the joint
What sealant work can’t fix
Sealant is not the answer to every problem, and we’d rather say so up front. Sealant won’t put right:
- Sashes that need overhauling
- Whether work needs listed building consent
- Masonry that needs repairing
If in doubt, call 0345 464 0079 or email us and we will say what we think.
Where we work in Oakhanger
- Period & listed homes
- Timber door frames
- Brick reveals
- Sash and case windows
- Stone surrounds
- Tenement windows
Can I do it myself?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, and the work is 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.
Common questions in Oakhanger
Is Oakhanger in your area for sand mastic?
Yes. Our work covers London and the South East, and Oakhanger is part of that. You can phone 0345 464 0079 or drop us an email and let us know what needs doing.
Is Oakhanger within the area you cover?
Yes. Oakhanger 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.
Can you replace silicone on a period window with sand mastic?
In most cases. The silicone is cut out and the joint cleaned, then point it with sand mastic.
Which products do you use?
Each joint gets the product that suits it. Where it moves, gets wet or faces the weather makes a difference, and we’ll explain our choice.
Are you fully insured?
Yes, we are fully insured for every job we do.
Do you take out the old sealant first?
Yes, every time. New silicone doesn’t stick to old silicone, so the joint is cleaned back first.
Are you an approved applicator?
Yes. We hold ARBOMaster approved applicator status, and we are fully insured.
Do you offer different sealant colours?
In most cases you can choose. We’ll explain which colours are available.