South East England and London

Sand Mastic in Hampshire

Sand mastic in all 683 towns and villages of Hampshire, done properly, with a clear quote before we start and a one-year guarantee.

Book sand mastic in Hampshire

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Sand mastic across Hampshire

Traditional burnt sand mastic around sash and case windows and doors in stone and brick. Choose your town from the list to see local details, and get in touch for a quick quote.

Largest places

Our sand mastic service in Hampshire

Traditional burnt sand mastic blends with stone and brick surrounds. It suits period and listed homes where a modern sealant bead would stand out. Common call-outs are for old sand mastic that has cracked, crumbled or fallen out and draughty sash windows at the surround, across tenement windows, timber door frames and stone surrounds.

Our applicators work methodically: protect, prepare, seal, tidy. For most jobs that takes anything from a few hours to a full day, depending on how many windows, and the area is left clean.

First, we look at the surrounds with you and agree what needs doing.
Old, loose mastic is raked out and the joint cleaned.
Deep voids are packed so the mastic is the right thickness.
The mastic is mixed, pressed into the joint by hand and shaped.
We dress the surface so it sits neatly against the masonry.

Pricing in Hampshire

The cost reflects the work involved, not a rough estimate. That’s why we ask a few questions first.

Why choose Mr Mastic

Trusted Arbo and Everbuild sealants
Every job guaranteed for a year
180+ five-star Google reviews
Experience in homes, commercial sites and hotels

Getting a quote

A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints.

Around Basingstoke

In Basingstoke, that means homes and buildings near King's Furlong Infant School and Nursery, Cranbourne and Eastrop Park. You’ll also find The Rising Sun pub (0.5 miles north-east), St Michael's Church (0.5 miles east) and The Costello School (1 mile east). Basingstoke’s nearest station is Basingstoke station, roughly 0.6 miles east. Well-known places in the area include Basing House (2.2 miles east) and The Malls (0.6 miles east). Open spaces near Basingstoke include Farleigh Hill and Daneshill Park Woods.

Windows and doors across Hampshire

From Basingstoke, Winchester and Gosport to its smaller places, Hampshire has windows and doors of every age and material. The mastic around all of them ages, and it’s usually the first thing to let the weather in.

Most of the South East has hard water, so limescale builds up on sealant, grout and fittings. Whatever the job in Hampshire, surfaces are cleaned back properly before new sealant goes in. Along the coast in Hampshire, window and wall joints facing the sea take the brunt of the weather, and that is where sealant normally gives up first. Good preparation and the right sealant help it cope.

Basingstoke: For site and facilities teams at buildings such as King's Furlong Infant School and Nursery, larger buildings have plenty of frames, and the mastic around each one ages. If you live in an older home near St Michael's Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.

What sealant work can’t fix

We’d rather tell you now than do work that won’t last, so here’s what sealant can’t put right:

Timber that has rotted
Cracked or broken glass
Sashes that need overhauling

Looking after it afterwards

Looking after new joints is easy:

Leave the new mastic unpainted
Ask the planning authority about consent for listed or conservation-area homes
Check the mastic when you check the paintwork
Plan mastic work ahead of painting

Don’t run silicone over the new mastic. If you see a crack, ask us to take a look before trying a quick fix.

Gaps round a sash box let in draughts and rain. The longer it’s left, the more the joint opens as more mastic falls out.

What we’re called out for in Hampshire

Decorating can disturb tired mastic. It’s often found when windows are being prepared for paint, which is a good time to renew it.

It’s worth asking for a quote if you see:

Tired mastic found when preparing windows for paint
Old sand mastic that has cracked, crumbled or fallen out
Gaps where the frame meets the masonry
Old cement repairs round a window that have failed

How the job changes by surface

Period and listed homes

Many older homes were built with sand mastic round the windows. On listed buildings, check with your planning authority first.

Timber door frames

Door frames get knocked and soaked and the mastic can crack early. It’s renewed by hand.

DIY versus a professional finish

Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.

If you’re set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.

Hampshire: your questions answered

Where is Mr Mastic based?

We are a Crawley-based firm, with over 20 years’ experience. Our area covers South East England, London and Scotland.

Do the sealants smell?

There can be a smell while the sealant cures, which fades as it sets. Opening a window helps.

How much does sand mastic cost in Hampshire?

Size, access and the old material all affect the cost. Call for a quick quote and we will talk you through it.

Do you work for landlords and businesses?

Yes. We work for householders, landlords, letting agents, businesses and hotels in Hampshire.

How long does the job take?

A typical job takes a few hours per window, depending on the condition of the joints. Your quote will say how long we expect yours to take.

Is consent needed for window work on a listed home?

It’s best to ask your local planning authority first. Sand mastic is often favoured as like for like, but they decide.

What should I tell you?

A short description and the location, plus photos if you have them. We’ll ask anything else we need to know.