Greater London · England
North Brixton Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in North Brixton and across Greater London. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Crumbling sand mastic round a window
- Draughts and rain around sash boxes
- Patchy fillers round a sash window
Sand mastic in North Brixton
Burnt sand mastic is a traditional material blends with stone and brick surrounds. It’s a good fit for period properties, where modern sealant can look out of place. We work on tenement windows, stone surrounds and timber door frames, and the jobs we see most are gaps between timber frames and stone or brick and patchy fillers round a sash window.
From mansion-block windows to modern glazing in new flats, London has every kind of frame. Over the years, the sealant around them shrinks, cracks and pulls away, letting in draughts and water.
The work is covered for a year after we finish. If anything isn’t right with it, phone 0345 464 0079 or send us an email.
- Place
- North Brixton (SW9, SW8, SE5)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quote
- A clear price before we start
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
How the visit works
All our tools and materials come with us in the van. After a quick look at the joints together, we protect the area and start. Most jobs take a few hours for a single window, longer for several. In North Brixton, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- We check the window surrounds and agree which joints need renewing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic is not too thick.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- The mastic is finished to sit tidily against the stone or brick.
Preparing for the visit
- Clear the area around the work
- Try not to wet indoor joints just before the visit
- Let us know about earlier repairs to the joints
Getting a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and email pictures if that’s easy.
Related advice
North Brixton homes and the weather
In London conversions and blocks, the lease decides who is responsible for the frames, so check that before booking. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For landlords with property near Loughborough Junction station, older sash windows in a rental need their mastic kept sound to keep the weather out. Schools such as Van Gogh Academy are buildings too, and the mastic around its windows and doors needs looking after like any other building’s.
North Brixton is about 2 miles south-west of London, in Greater London. We carry out sand mastic for homes and businesses in North Brixton. Across Greater London, we cover 764 places, and North Brixton is one of them.
Every address in SW9, SW8 and SE5 is within our area for sand mastic, from the main roads to the quietest streets. Whether your property is on Lett Road, Lorn Road and Oak Square or anywhere close by, we can help. Main roads around North Brixton include the A203. Other places close to North Brixton include Angell Town (1 mile south), Little Portugal (1 mile west), Stockwell (1 mile south-west), South Lambeth (1 mile north-west) and Kennington (1 mile north-west). Further out, we also cover City of Westminster (3 miles north-west), Marylebone (3 miles north-west), Kensington (4 miles north-west), St Pancras (4 miles north), Shoreditch (4 miles north-east) and Walthamstow (9 miles north-east).
Near you in North Brixton
We work in homes and buildings around The Crown & Anchor pub, Lambeth Palace Library and Durand Academy, among other places. Other local landmarks include Max Roach Park (0.5 miles south) and Platanos College (within half a mile west). The nearest railway station is Loughborough Junction station, about 0.7 miles south-east. Other landmarks nearby include Type Museum (under half a mile west) and St Giles' Hospital (1.3 miles east). Open spaces near North Brixton include Battersea Park Lake and Knight's Hill.
Common questions in North Brixton
Do you cover North Brixton for sand mastic?
Yes. We work across London and the South East, and North Brixton is part of that. Just call 0345 464 0079 or send us an email with a few details of the job, and we will send you a clear quote.
Is parking a problem for a job in North Brixton?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. The visit is then planned around what’s available.
Do you have insurance?
Yes. Mr Mastic is fully insured, and we have been doing sealant work for more than 20 years.
How long does sand mastic take?
Most jobs take a few hours per window, depending on the condition of the joints. Your quote will say how long we expect yours to take.
What exactly is sand mastic?
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.
Can you seal over the old sealant?
No. New silicone will not bond to old silicone, and it traps any mould or water underneath. It all has to come out first.
Do you work for hotels and businesses?
Yes. We can plan bigger jobs in stages.
I’m a tenant. Can you help?
Yes, though it’s best to check with your landlord first. Landlords are often happy for the work to be arranged.
Aftercare tips
Once the sealant has cured, a few habits help it last:
- Inspect the joints round the windows every year or so
- Ask the planning authority about consent for listed or conservation-area homes
- Don’t paint over the new mastic
- Plan mastic work ahead of painting
Leave the new mastic unpainted, which is the traditional advice. Ask us before any decorating around it.
Fine cracks show the mastic is starting to fail. Renewing it then is simpler than waiting until it falls out.
Do you need sand mastic in North Brixton?
Decorating can disturb tired mastic. Many people find it crumbling when they prepare the windows, which is a good time to renew it.
Common reasons people contact us include:
- Failed mastic on an exposed elevation
- Crumbling sand mastic round a window
- Draughty sash windows at the surround
- Mastic that needs renewing before redecorating
As a London address, North Brixton can be tricky for parking: let us know about parking bays, permits or a driveway.
What to look for in a quote
- Whether the sealant suits the joint
- Who does the work, and how experienced they are
- Whether you can choose the colour
- How long the guarantee is
What affects the cost of sand mastic
Some jobs are bigger than they look, and some smaller. What affects the quote:
- The number of rooms or windows
- Working hours on commercial sites
- How easy the joints are to reach
- The old material and how stubborn it is
Commercial jobs are quoted on the same basis as homes: how much there is to do, how we reach it and what it needs, along with when we can work on site. Ask us for a quote and we will go through it with you.
Asking for a quote
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- If someone has resealed it before
- A few photos by email, if you can
- The problem you’ve noticed
- How many joints, rooms or windows are involved
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll explain how we’d tackle it. Whenever you’re ready, ring 0345 464 0079 or drop us an email.
Towns and villages near North Brixton
Also in North Brixton
Leave it or put it right?
Silicone might seem the quicker option, but it can look wrong on a period surround. Sand mastic suits the building and finishes neatly against the masonry. Damp from a failed joint spreads quietly in older London brickwork and timber, and by the time it shows on a wall or ceiling in North Brixton, the repair is bigger than the sealant job would have been.
We do not show prices on the website, because the cost depends so much on the job itself. Call for a quick quote.
What you get with us
- 20+ years of sealant experience
- 12-month guarantee on every job
- 180+ five-star Google reviews
- Approved under the ARBOMaster scheme
Take a look at our cost guide or what customers say.
Landlord and commercial work in North Brixton
For anyone letting property in or around North Brixton, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs, and pictures by email help.
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.
What the job involves on each surface
Brick reveals
Sand mastic is also used where timber frames meet brick. It gives a traditional finish.
Timber door frames
Door frames get knocked and soaked, so their mastic can fail sooner. It’s renewed by hand.