Hampshire · England
Sand Mastic in Bagnum
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homeowners, landlords and businesses in Bagnum. Fully insured, ARBOMaster approved and guaranteed for a year.
- Mastic that needs renewing before redecorating
- Draughty sash windows at the surround
- Mastic dropping out of the joint
Sand mastic for homes and businesses in Bagnum
On many period windows, sand mastic looks right and suits the building. On modern frames we’d normally use a flexible sealant, and we will talk through which suits your home. We’re often asked to deal with old sand mastic that has cracked, crumbled or fallen out and cracked mastic round a front door frame, on stone surrounds, tenement windows and timber door frames.
Somewhere as small as Bagnum, older homes often have timber frames set in stone or brickwork. Older buildings like these don’t always suit modern silicone, so the sealant has to be chosen to suit the building.
All our work comes with a one-year guarantee.
- Where
- Bagnum (BH24)
- Region
- Hampshire
- Cover
- 12 months on all our work
- Quotes
- A clear price before work begins
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Leave it or put it right?
Not every filler suits an old window surround. Sand mastic is the like-for-like choice, which can matter on listed and conservation-area homes. In a small place like Bagnum, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, any mould to treat, and whether we need extra access for height. Your quote takes all of that into account.
Why book with us
- Neat joints and a tidy finish
- Every job guaranteed for a year
- Sanitary silicone with an anti-fungal additive in wet areas
- An ARBOMaster approved applicator
See what affects the cost and our reviews.
Questions from Bagnum
Do you cover smaller places like Bagnum?
Yes, we do. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Do you cover Bagnum for sand mastic?
Yes, Bagnum is within the area we cover. Our work covers London and the South East. You can ring 0345 464 0079 or email us and tell us what needs doing, and we will give you a clear price.
Can new sealant go over the old?
No. Fresh sealant doesn’t stick to old sealant, and anything trapped underneath, including mould and water, stays there. It all has to come out first.
When will the new mastic be hard?
It takes a while. It skins first and hardens fully later, and we’ll tell you what to expect.
Can you do several jobs on one visit?
Yes, we can. Several rooms, windows or areas can go on one quote.
What’s sand mastic made of?
It’s a mix of sand and a linseed-oil-based binder. It’s built up in the joint by hand and shaped to suit the surround.
What does sand mastic cost?
We don’t 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. We agree the price before any work begins.
Is the work guaranteed?
There’s a 12-month guarantee on every job, sand mastic included.
For landlords and businesses
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. We can quote for more than one property at once.
We regularly work with letting and managing agents. Tell us the address, the job and how access works.
What we’re called out for in Bagnum
Most of it is simply age. Even well-laid mastic needs renewing in time and how long it lasts depends on the weather it faces.
People generally contact us after spotting one of these:
- Mastic that needs renewing before redecorating
- Mastic worn away on windows facing the weather
- Silicone on a period window that looks wrong
- Draughts and rain around sash boxes
Historic houses such as Avon Tyrrell House, about 1.7 miles south-east, show how far back building around Bagnum goes, and older homes nearby need a sealant that suits their walls.
What your quote should include
- Who does the work, and how experienced they are
- What preparation is included
- How long to leave it before use
- How hidden problems are handled
Nearby places to Bagnum
Other services in Bagnum
DIY sealant or a professional job?
If you are set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Sand mastic in Bagnum: local notes
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. With historic houses such as Avon Tyrrell House (about 1.7 miles south-east) nearby, there’s older building stock in the area around Bagnum as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
For site and facilities teams at buildings such as Ringwood School, the mastic around its windows and doors needs looking after like any other building’s.
Bagnum is about 2 miles south-east of Ringwood, in Hampshire. Homes, rented property, offices and hotels in Bagnum can book us for sand mastic, old or new, large or small. Every job comes with our one-year guarantee. Bagnum is one of 683 places in Hampshire we cover. Our Southampton page covers work nearby.
Our applicators cover all of the BH24 postcode area for sand mastic. Neighbouring places we cover for sand mastic include Crow (1 mile north), Upper Kingston (1 mile north-west), Hightown (1 mile north), Foulford (2 miles north) and Ringwood (2 miles north-west). Larger places within reach include Totton (13 miles north-east), Lymington (10 miles south-east), New Milton (6 miles south-east), Barton on Sea (7 miles south-east), Dibden Purlieu (15 miles east) and Marchwood (14 miles east).
Local landmarks in Bagnum
Well-known places in the area include St Leonard's Hospital (4.4 miles west). Green spaces nearby include St Catherine's Hill and Linbrook Lake.
How the visit works
Most of a good job is in the preparation, so that is where we spend the time. Every joint is cleaned and dried before new material goes in. In total, it usually takes a few hours for a single window, longer for several. Somewhere like Bagnum 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 start by checking each surround and agreeing the joints to renew.
- We rake out the old mastic and clean the joint.
- Large voids are packed out first, so the mastic isn’t too thick.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- We dress the surface so it sits neatly against the masonry.
Before we arrive
- Where the joints are inside, avoid wetting them before we arrive
- Let us know about parking restrictions
- Keep pets and children clear of the area while we work
Get a quote
Want a quote for sand mastic? Please phone 0345 464 0079 or drop us an email and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.
Related advice
How we quote for sand mastic
You’ll get a clear quote before any work starts. It’s based on:
- Any working-time requirements on site
- The type of sealant required
- Whether there’s mould to deal with
- Whether the work is at height
The cost reflects the work involved, not guesswork. That’s why we ask a few questions first and send you a clear quote before we start.
Asking for a quote
To help us quote quickly, let us know:
- Whether it’s a home or a business
- How we’d reach the joints
- Where the job is, and your postcode
- What the problem is, such as mould, gaps, leaks or cracking
There’s no standard price list, as no two jobs are quite the same. Instead, we give you a clear price for your job. To get started, phone 0345 464 0079 or drop us an email.
Keeping the joints in good condition
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Plan mastic work ahead of painting
- Leave the new mastic unpainted
- Have rotten timber repaired before new mastic goes in
- Find out about consent before window work on a listed home
Check the mastic when you check the paintwork. Small cracks are easier to deal with early.
It’s best to renew mastic before painting the windows. Painting over failed mastic hides the problem for a while.