Greater London · England
Mottingham Sand Mastic
Specialist sand mastic for Mottingham: careful preparation, the right product and tidy work. Call for a quick quote.
- Gaps between timber frames and stone or brick
- Mastic worn away on windows facing the weather
- Mastic dropping out of the joint
Sand mastic in Mottingham, done properly
Fresh sand mastic forms a skin quite soon but full hardening takes longer. Traditional guidance is not to paint over it, so ask us before you decorate. Common call-outs are for mastic worn away on windows facing the weather and tired mastic found when preparing windows for paint, on period & listed homes, sash and case windows and brick reveals.
From mansion-block windows to modern glazing in new flats, London has every kind of frame. The mastic around them dries out and cracks with age, letting in draughts and water.
Big or small, you get the same 12-month guarantee.
- Location
- Mottingham (SE9, SE12, BR1)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
What affects the cost of sand mastic
We don’t publish a price list. The quote depends on:
- When we can work, for business premises
- The number and length of the joints
- Whether there’s mould to deal with
- How many rooms, windows or areas are involved
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
What we need to know
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- Photos by email, if that is easy
- Where the property is
- Any access issues, like height or stairs
- The rough size of the job
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is. When it suits you, call 0345 464 0079 or drop us an email.
DIY sealant or a professional job?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, then guaranteed for a year.
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Work for landlords, hotels and businesses
For anyone letting property in or around Mottingham, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs.
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Resealing at the right time is simple maintenance that we can handle for you.
Nearby places to Mottingham
Other services in Mottingham
How to look after the new joints
Once the sealant has cured, a few habits help it last:
- Do not run silicone over sand mastic
- Clear gutters so water does not pour onto the windows
- Ask a joiner to look at soft timber first
- Leave the new mastic unpainted
Make sure water drains away from the window surround. Constant wetting wears the mastic faster.
Crumbling mastic lets rain into the joint. That water can reach the timber frame and the wall so early renewal protects both.
When to call us in Mottingham
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.
Keep an eye out for these signs:
- Silicone on a period window that looks wrong
- Wind and rain getting in round a sash window
- Open joints round the window box
- Cracked mastic round a front door frame
For landlords with property near Grove Park station, any sash windows need sound mastic to keep draughts and rain out.
What your quote should include
- How the joint is cleaned and prepared
- Whether VAT is included
- Is the old sealant removed completely?
- Which sealant they’ll use, and why
How the job changes by surface
Sash and case windows
Sash windows are where we do most sand mastic work. We renew the mastic round each box.
Timber door frames
Period doors in stone or brick openings are often pointed with sand mastic. We renew it the same way as on windows.
The process
On the day, we start by going over the job with you, so there are no surprises. We protect the surfaces around the joints before any work begins. Most jobs take a few hours per window, depending on the condition of the joints. For a job in Mottingham, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor we’re working on and whether there’s a lift.
- We look at the surrounds with you and agree the joints to renew.
- We remove the old, loose mastic.
- Deep gaps are packed so the mastic sits at the right depth.
- We apply the mastic by hand and shape it.
- We dress the finish so it sits neatly against the masonry.
Getting ready for the visit
- Tell us about any water getting in
- Tell us if parking is tricky
- Plan for the work area to be out of bounds to pets and children
Getting a quote
For sand mastic in Mottingham, ring 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and you will get a clear quote before any work starts.
Advice
Frames and glazing around Mottingham
In a converted house or block, who looks after the windows depends on the lease, so check that before booking. The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Managing a site like Marvels Lane Primary School? Then its window and door frames need their mastic kept sound, just like a home’s. Homes close to Jubilee International Church include some older properties, and the joint between an old wall and a newer frame is generally the first place rain gets in.
Mottingham is about 1 mile south-west of Eltham, in Greater London. Across the SE9 area, we can carry out sand mastic at your property. We cover 764 towns and villages across Greater London. For nearby work, see our London page (7 miles or so).
Jobs for sand mastic in SE9, SE12 and BR1 is quoted and booked the same way as anywhere else. That includes homes and businesses on Horley Road, Dorset Road and Albert Road. We also cover Chinbrook (1 mile south-west), Grove Park (1 mile west), Coldharbour (1 mile east), Middle Park (1 mile north) and Horn Park (1 mile north-west). Further out, we also cover London (7 miles north-west), City of Westminster (10 miles north-west), Marylebone (10 miles north-west), Kensington (11 miles north-west), St Pancras (9 miles north-west) and Shoreditch (8 miles north-west).
Landmarks near Mottingham
Around Mottingham, our work takes us to homes and buildings near Colfe's School, Chinbrook Meadows and Haberdashers' Aske's Knights Academy and the streets around them. The closest station to Mottingham is Grove Park station, roughly 0.7 miles west of the centre. Well-known places in the area include Greenwich Castle (3.5 miles north-west) and Prefab Museum (1.7 miles west). The countryside around Mottingham includes Summer Hill and The Tarn.
Mottingham: your questions answered
Is parking an issue for sand mastic in Mottingham?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. That way the visit can be planned around it.
I let a flat near Grove Park station. Can you help?
Yes, rental work is part of what we do. Just phone 0345 464 0079 or email us and tell us about the property, and we’ll give you a clear quote.
Should I try DIY first?
Some simple jobs can be done by a careful DIYer. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Can you work on commercial sites?
Yes. We’ve worked for hotels, offices and other businesses, and we’re fully insured.
How much does sand mastic cost in Mottingham?
The cost depends on the size of the job, access and how much old sealant has to come out. Call for a quick quote and we will talk you through it.
How long does sand mastic take to go off?
A skin forms quite soon, but full hardening takes longer. We’ll explain what to expect before we leave.
Where are you based?
We are based in Crawley, and we work across South East England, London and Scotland.
Is the work guaranteed?
Every job comes with our 12-month guarantee, and we’re fully insured.