Hampshire · England
Sand mastic for sash & case windows in Keyhaven, Hampshire
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homeowners, landlords and businesses in Keyhaven. Fully insured, ARBOMaster approved and guaranteed for a year.
- A silicone bead on a sash window that spoils the look
- Draughts and rain around sash boxes
- Mastic that needs renewing before redecorating
Aftercare tips
Joint life depends on how it’s used and looked after. We suggest:
- Get any rot dealt with first
- Plan mastic work ahead of painting
- Ask us before painting near the mastic
- Do not run silicone over sand mastic
Keep gutters and sills clear so water runs away from the surround. Constant wetting wears the mastic faster.
Renewing mastic before redecorating saves doing it twice. Painting over failed mastic hides the problem for a while.
Sand mastic in Keyhaven
Old sand mastic cracks, crumbles and falls out over time and gaps open up round the frame. We rake it out and renew it so the surround looks right again. Common call-outs are for open joints round the window box and old cement repairs round a window that have failed, on brick reveals, tenement windows and sash and case windows.
In a village or hamlet like Keyhaven, older cottages and farmhouses often have timber windows set in stone or brick. Not every older frame suits a modern silicone bead, and sometimes a traditional sand mastic is the better choice.
Every job is covered by a one-year guarantee.
- Where
- Keyhaven (SO41)
- Region
- Hampshire
- Guarantee
- 12 months on all our work
- Price
- A clear price before work begins
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
What sealant work cannot fix
We won’t take on work that won’t last, so these are the limits:
- Sashes that need overhauling
- Broken panes
- Decayed frames that need repair
Not sure which it is? You can phone 0345 464 0079 or email us and we’ll tell you honestly.
Surfaces we seal
- Sash and case windows
- Timber door frames
- Stone surrounds
- Brick reveals
- Period & listed homes
- Tenement windows
Windows and doors in Keyhaven
Keyhaven is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. Both are hard on the mastic around older windows and doors, which can dry out and crack sooner where a building faces the weather. 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.
In the older streets around Church of All Saints, the joint between an old wall and a newer frame is generally the first place rain gets in. Schools such as Milford-on-Sea Church of England Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages. Letting a property close to Lymington Town station? Then older sash windows in a rental need their mastic kept sound to keep the weather out.
Keyhaven is about 3 miles south of Lymington, in Hampshire. Whether you’re in the middle of Keyhaven or further out, sand mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Keyhaven is one of 683 places in Hampshire where we work. Southampton is on our list too, about 16 miles from Keyhaven.
We cover every part of the SO41 postcode area for sand mastic. Streets in the area include New Road, Keyhaven Road and Saltgrass Lane, all of which we cover. Nearby, we also carry out sand mastic in Milford on Sea (1 mile west), Lymore (1 mile north-west), Lower Pennington (1 mile north-east), Everton (2 miles north-west) and Pennington (2 miles north). Further out, we also cover Totton (14 miles north), Hythe (12 miles north-east), New Milton (4 miles north-west), Ringwood (13 miles north-west), Warsash (15 miles north-east) and Barton on Sea (4 miles west).
Landmarks near Keyhaven
Locally, jobs take us to homes and businesses close to The Gun Public House and Priestlands School. The closest station to Keyhaven is Lymington Town station, roughly 3 miles north-east of the centre. A little further out are St Barbe Museum and Art Gallery (2.8 miles north-east) and Yarmouth Castle (3.3 miles east). Not far away are Milford on Sea LNR and Tennyson Down.
How the job changes by surface
Timber door frames
Sand mastic is used round timber door frames too. The method is the same as for windows.
Stone surrounds
Old stone surrounds are often uneven, so the joint varies in width. We shape it by hand to follow the stone.
DIY sealant or a professional job?
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions.
Landlord and commercial work in Keyhaven
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.
Towns and villages near Keyhaven
What else we do in Keyhaven
Why act early in Keyhaven
Replacing sash windows is a big decision for a period home and on a listed home, consent may be needed. If the frames are sound, renewing the mastic deals with gaps and draughts at the surround. Around Keyhaven, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Every job is a little different, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all make a difference, and we’ll explain the quote if you ask.
Why book with us
- Any old sealant cut out fully, not covered over
- Neat joints and a tidy finish
- Full insurance on every job
- ARBOMaster approved applicator
Read what affects the cost or our reviews.
What happens on the day
Our applicators work methodically: protect, prepare, seal, tidy. For most jobs that takes a few hours per window, depending on the condition of the joints and we leave things clean and tidy. In a small place like Keyhaven, access is usually the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We look at the surrounds with you and agree the joints to renew.
- Old mastic and any loose material are raked out.
- We pack any deep voids first.
- The sand mastic is mixed and pressed into the joint by hand.
- We dress the finish so it sits neatly against the masonry.
Getting ready for the visit
- On commercial sites, let us know about site rules
- Mention any tricky access
- Move anything stored near the joints
Ask for a quote
Need a quote? Please phone 0345 464 0079 or drop us an email with a few details. You will know what we plan to do, and what it will cost, before any work begins.
Advice
Questions from Keyhaven
Is sand mastic in a coastal place like Keyhaven any different?
Coastal weather is harder on outside sealant: there’s more wind-driven rain and, closer to the shore, salt in the air. The right product, a clean joint and the right depth all help it cope.
Is Keyhaven within the area you cover?
Yes, Keyhaven is covered. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Can you replace silicone on a period window with sand mastic?
Yes, we do this often. All the old silicone is removed first so the mastic can sit properly.
Do you do commercial work?
Yes. Larger jobs can be planned room by room or area by area to suit the site.
What does sand mastic cost?
We don’t publish prices, because the cost depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
Is sand mastic better than silicone for my windows?
For period timber windows in stone or brick, sand mastic is often the better fit. On modern frames, we’d normally use a flexible sealant.
What’s sand mastic made of?
It’s the traditional filler for the joint round timber windows and doors. It’s made with sand and a linseed-oil-based binder.
When will the new mastic be hard?
It skins over fairly quickly but takes longer to harden fully. We will explain what to expect before we leave.