Greater London · England
Sand Mastic in North Greenwich
Our applicators work in North Greenwich on traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly.
- Failed mastic on an exposed elevation
- Old sand mastic that has cracked, crumbled or fallen out
- Mastic that needs renewing before redecorating
Sand mastic in North Greenwich, done properly
Fresh sand mastic forms a skin quite soon but full hardening takes longer. Traditionally, sand mastic is left unpainted, so ask us before you decorate. We work on brick reveals, sash and case windows and tenement windows, and the jobs we see most are mastic round period door frames that has failed 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.
There’s a 12-month guarantee on every job, whatever its size.
- Where
- North Greenwich (E14, SE8, SE10)
- Region
- Greater London
- Cover
- A year, on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Should I try it myself first?
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
Nearby places to North Greenwich
What else we do in North Greenwich
North Greenwich: your questions answered
Is North Greenwich in your area for sand mastic?
Yes. We work across London and the South East, and North Greenwich is part of that. You can phone 0345 464 0079 or email us and tell us what needs doing.
Is parking a problem for a job in North Greenwich?
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.
Is it possible to paint over sand mastic?
The usual advice is to leave sand mastic unpainted. If you’re redecorating the window, ask us first and we’ll advise.
Can old silicone round a sash window be swapped for sand mastic?
Yes. We remove the silicone and clean the joint, then point it with sand mastic.
Can you quote for more than one area?
Yes. More than one area can be quoted together.
How do I get a quote for sand mastic in North Greenwich?
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’ll talk you through it.
Will there be a smell?
It depends on the product. Some products have a noticeable smell, others very little, and any smell fades as they cure.
Where are you based?
Mr Mastic is based in Crawley. We cover North Greenwich and the rest of Greater London.
How the job changes by surface
Timber door frames
Round a period front door, sand mastic gives the right look.
Stone surrounds
The stone is treated with care when the old mastic comes out.
North Greenwich homes and the weather
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. Historic houses like Queen's House (about 0.8 miles south-east) are a reminder that the area around North Greenwich has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
In the older streets around Church of St Nicholas, frames set in older brick or stone need a sealant that suits the wall as well as the frame. For landlords with property near Greenwich station, any sash windows need sound mastic to keep draughts and rain out.
North Greenwich is about 1 mile north-west of Greenwich, in Greater London. Every kind of property in North Greenwich is covered for sand mastic, old or new, large or small. Every job comes with our 12-month guarantee. North Greenwich is one of 764 places in Greater London we cover.
All of E14, SE8 and SE10 is covered for sand mastic. We cover properties on Creek Road, Wynan Road and Undine Road and the roads around them. Close by, we work in Isle of Dogs (1 mile south-east), Millwall (1 mile west), Cubitt Town (1 mile north-east), Deptford (1 mile south-west) and Greenwich (1 mile south-east). We also work in nearby towns such as London (3 miles west), City of Westminster (6 miles west), Marylebone (6 miles west), Kensington (8 miles west), St Pancras (5 miles north-west) and Shoreditch (4 miles north-west).
Around North Greenwich
Around North Greenwich, our work takes us to homes and buildings near Laban Centre, Canary Wharf College 3 and St. Paul's. Other local landmarks include Mudchute Park and Farm (less than half a mile north-east) and The Ferry House Public House (under half a mile south-east). For rail, the closest station is Greenwich station, about 0.8 miles south of the centre. Other landmarks nearby include Old Royal Naval College (0.7 miles south-east) and Greenwich Castle (1.1 miles south-east). For a walk, there’s Sue Godfrey Nature Park and Tower Hill.
What we can’t put right
Some problems need a builder, plumber or other trade rather than us:
- Damaged stone surrounds
- Cracked or broken glass
- Decisions on consent for listed homes
If in doubt, ring 0345 464 0079 or send us an email and we’ll say what we think before booking.
Joints and surfaces we work on
- Sash and case windows
- Brick reveals
- Period & listed homes
- Tenement windows
- Timber door frames
- Stone surrounds
Quotes for sand mastic in North Greenwich
There’s no set price list, because no two jobs are the same. The quote depends on:
- When we can work, for business premises
- Mould in or behind the old joints
- How much there is to do
- Whether the work is at height
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you’re not sure whether it needs doing, phone 0345 464 0079 or drop us an email and we will give you an honest view and a quote.
What we need to know
To help us quote quickly, please include:
- The problem you’ve noticed
- Access, such as stairs, a lift or height
- How many joints, rooms or windows are involved
- A few pictures by email, if you can
Need a quote? Please phone 0345 464 0079 or email us with a few details. You will know what we plan to do, and what it will cost, before any work begins.
Common problems we fix in North Greenwich
Most of it is simply age. Even well-laid mastic needs renewing in time, depending on exposure and upkeep.
These are the problems we’re asked about most:
- Mastic worn away on windows facing the weather
- Wind and rain getting in round a sash window
- Cement or filler used on old window joints that has cracked
- Tired mastic found when preparing windows for paint
North Greenwich is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Comparing quotes
- Is the old sealant removed completely?
- Whether VAT is included
- How the joint is cleaned and prepared
- Whether they’re fully insured
What happens on the day
Our applicators work methodically: protection first, then preparation, sealing and a tidy-up. For most jobs that takes a few hours for a single window, longer for several, and the area is left clean. For a job in North Greenwich, parking and access are the things to plan: let us know about parking, the floor we will be working on and any lift or shared entrance.
- We start by checking each surround and agreeing the joints to renew.
- 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.
- The finish is dressed so it sits neatly against the stone or brick.
Getting ready for the visit
- On commercial sites, let us know about site rules
- Tell us about access, such as stairs, a lift or high-level joints
- Where the joints are inside, avoid wetting them before we arrive
Getting a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is. When it suits you, phone 0345 464 0079 or send us an email.
Related advice
Leave it or put it right?
New mastic over crumbling mastic will not hold. We remove the loose material first so the new work lasts. In a flat in North Greenwich, failed sealant seldom stays inside your own four walls: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, along with when we can work on site. Ask us for a quote and we will explain what it covers.
Why choose Mr Mastic in North Greenwich
- Arbo and Everbuild products
- Domestic, commercial and hotel work
- We’re fully insured
- A 12-month guarantee on all work
Read what affects the cost and what customers say.