Hampshire · England
Sand mastic for sash & case windows in New Forest, Hampshire
Sand mastic for New Forest, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Old cement repairs round a window that have failed
- Mastic that needs renewing before redecorating
- Wind and rain getting in round a sash window
How the visit works
On the day, there’s very little for you to do. Point us to the joints and we’ll get on with it. The job generally takes a few hours per window, depending on the condition of the joints from start to finish. Somewhere like New Forest needs a little journey planning: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- Large voids are packed out.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
Preparing for the visit
- Keep pets and children clear of the area while we work
- Where the joints are inside, avoid wetting them before we arrive
- Let us know about stairs, lifts or work at height
Get a quote
If you are in New Forest and need sand mastic, phone 0345 464 0079 or email us. Tell us what the problem is and where, and you will get a clear quote before we start.
Advice
Sand mastic for homes and businesses in New Forest
Sand mastic suits most period window surrounds. Newer frames generally get a flexible sealant instead, and we will talk through which suits your home. Typical jobs include wind and rain getting in round a sash window and gaps between timber frames and stone or brick, on brick reveals, period & listed homes and timber door frames.
Mastic can only go onto a dry, clean joint, so window work in New Forest is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
Each job carries a 12-month guarantee, whatever its size.
- Where
- New Forest (SP6)
- Region
- Hampshire
- Cover
- A year, on every job
- Quotes
- A clear price before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Nearby places to New Forest
What else we do in New Forest
Surface by surface
Tenement and terrace windows
In shared buildings, the windows may be part of a wider repair, so check who is responsible first.
Period and listed homes
Materials matter on listed and conservation-area homes. Like-for-like sand mastic is usually favoured.
For landlords and businesses
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements.
In hotels, rooms out of use cost money, so we plan the work room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
Keeping the joints in good condition
A little care helps the new joints last. We recommend:
- Leave the new mastic unpainted
- Take care around the mastic when scraping paint
- Make sure water runs off the sill
- Get any rot dealt with first
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.
Should I try it myself first?
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.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
New Forest homes and the weather
Compared with the north and west, the South East gets less rain, 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, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. In and around New Forest, as anywhere, good sand mastic starts with a clean, dry, properly prepared joint.
New Forest is in Hampshire. New Forest gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. 683 places in Hampshire are on our list, from the larger towns to small villages. We also work in Southampton, around 23 miles away.
Jobs for sand mastic in SP6 is quoted and booked the same way as anywhere else. Sand mastic is available to properties on Sillens Lane and Townsend Lane and the roads around them. If you are just outside New Forest, we cover Martin (1 mile north-east), Rockbourne (3 miles east) and Damerham (3 miles south-east). Larger places within reach include Ringwood (11 miles south-east), Fordingbridge (6 miles south-east), St Leonards (11 miles south), Alderholt (6 miles south-east), Poulner (11 miles south-east) and Ashley Heath (10 miles south).
What’s near New Forest
Well-known places in the area include Cranborne Castle Hill (4.4 miles south). Green spaces nearby include Western Downs.
Leave it or put it right?
Filling over old, loose mastic doesn’t last. Raking out and preparing the joint gives it a sound base so the new mastic stays put. Older cottages and farmhouses around New Forest can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote and we will talk you through it.
Why us?
- Every job guaranteed for a year
- 20+ years of sealant experience
- Tidy, careful work
- Quality sealants from Arbo and Everbuild
Read our cost guide or what customers say.
Quotes for sand mastic in New Forest
There’s no set price list, because jobs vary so much. What we look at:
- The size of the job
- How many rooms, windows or areas are involved
- The old material and how stubborn it is
- The type of sealant required
Leaving a failed joint normally makes the job bigger, not smaller, because water and mould keep working on it. If you are not sure whether it needs doing, ring 0345 464 0079 or send us an email for an honest opinion and a quote.
What we need to know
Photos by email are helpful but not essential. Please mention:
- The problem you’ve noticed
- Where the job is, and your postcode
- How we’d reach the joints
- How many joints, rooms or windows are involved
Asking for a quote is easy: let us know what needs doing and where, and roughly how big it is. Photos by email help us understand the job.
Your questions about sand mastic in New Forest
Do you cover smaller places like New Forest?
Yes, we do. Our work covers London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Is there a guarantee on sand mastic in New Forest?
All our work, in New Forest and everywhere else, comes with a 12-month guarantee. We’re also fully insured and ARBOMaster approved.
I’m a tenant. Can you help?
We’re happy to deal with the tenant, landlord or agent. Get your landlord’s agreement first.
Is it possible to take out silicone and use sand mastic instead?
Yes. We remove the silicone and clean the joint, then point it with sand mastic.
Can new sealant go over the old?
No. New silicone will not bond to old silicone, and it traps any mould or water underneath. It all has to come out first.
Should I use sand mastic or silicone?
That depends on your windows. On many period windows, sand mastic looks right and suits the building and newer frames usually get a flexible sealant.
What do you need from me for a quote?
The location, the problem and the rough size of the job. If you can, email a few photos.
Do I need to be at home?
It depends on the job. For work indoors, someone needs to let us in.