Greater London · England
New Cross Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for New Cross, backed by a one-year guarantee. Ask us for a quote.
- Mastic that needs renewing before redecorating
- Gaps between timber frames and stone or brick
- Mastic round period door frames that has failed
Landlords, agents and businesses in New Cross
Housing providers, facilities teams and property managers book us too in New Cross and across Greater London. We can quote a run of properties together, and we are fully insured for the work.
If you manage several properties in or around New Cross, several properties can go on one quote. Just tell us the addresses and what each one needs, and pictures by email help.
Sand mastic in New Cross, done properly
Across New Cross, we renew sand mastic around sash and case windows. Each joint is raked out, prepared and pointed by hand for a neat, traditional finish. We work on tenement windows, timber door frames and period & listed homes, and common reasons people get in touch are mastic that needs renewing before redecorating and modern sealant on a period surround.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. The mastic around them dries out and cracks with age, letting in draughts and water.
Every job is covered by our one-year guarantee, wherever you are in Greater London.
- Location
- New Cross (SE8, SE14, SE4)
- Region
- Greater London
- Guarantee
- One year on every job
- Price
- A clear price before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
What affects the cost of sand mastic
Some jobs are bigger than they look, and some smaller. What affects the quote:
- How easy the joints are to reach
- The type of sealant required
- The amount of work
- Whether old sealant or filler has to be cut out
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs, along with when we can work on site. Call for a quick quote and we’ll explain what it covers.
Asking for a quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- How we’d reach the joints
- The type of property
- The rough size of the job
- What the problem is, such as mould, gaps, leaks or cracking
We do not publish a price list. Instead, your job gets its own clear quote. To get started, phone 0345 464 0079 or drop us an email.
Can I do it myself?
If you do try it yourself, take your time over the 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.
A DIY attempt does not rule out a professional job. We cut it out and start again, so just mention it when you contact us.
What else we do in New Cross
Windows and doors in New Cross
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as Queen's House (about 1.5 miles north-east) nearby, there’s older building stock in the area around New Cross as well as newer homes. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
As a London address, New Cross can be tricky for parking: let us know about parking bays, permits or a driveway. Rented homes near New Cross station change hands often, and older sash windows in a rental need their mastic kept sound to keep the weather out.
New Cross is about 3 miles south-east of London, in Greater London. Whether you are in the middle of New Cross or further out, we cover sand mastic for every kind of property, from flats and houses to offices and hotels. Our Greater London coverage runs to 764 places, and New Cross is one of them.
Jobs for sand mastic in SE8, SE14 and SE4 works the same way as everywhere else we cover. Whether your property is on Ivy Road, Mona Road and Avon Road or anywhere close by, our applicators can take on the job. New Cross sits on or near the A2209 and A2210. Neighbouring places we cover for sand mastic include St Johns (1 mile east), Telegraph Hill (1 mile south-west), Deptford (1 mile north-east), Nunhead (1 mile south-west) and Lewisham (1 mile south-east). Within a short drive, we also cover London (3 miles north-west), City of Westminster (6 miles north-west), Marylebone (6 miles north-west), Kensington (8 miles west), St Pancras (5 miles north-west) and Shoreditch (4 miles north-west).
What’s near New Cross
In New Cross, that means homes and buildings near Wickham Arms, Fordham Park and Addey and Stanhope School, among other places. Also close by are St. Paul's (0.7 miles north-east) and Laban Centre (0.9 miles north-east). There’s a railway station in New Cross itself: New Cross station. Well-known places in the area include Fan Museum (1.2 miles north-east) and Greenwich Castle (1.5 miles east). Green spaces nearby include St. James's Park Lake and Tower Hill.
How it works
Good joint work is mostly preparation, and we don’t rush it. Joints are cleaned back and dried before anything new goes in. All told, the work takes a few hours per window, depending on the condition of the joints. In New Cross, as in most of London, parking needs a little planning. It helps if you can point us to a visitor permit or a bay close to the door.
- We look at the surrounds with you and agree the joints to renew.
- Old mastic and any loose material are raked out.
- Deep gaps are packed so the mastic sits at the right depth.
- The sand mastic is mixed and pressed into the joint by hand.
- We dress the finish so it sits neatly against the masonry.
Before we arrive
- Keep pets and children clear of the area while we work
- Mention any parking rules near the property
- Clear items away from the joints we’re working on
Get a quote
If you’re in New Cross and need sand mastic, phone 0345 464 0079 or email us. Tell us what the problem is and where, and you’ll get a clear quote before work begins.
Read more
Leave it or put it right?
An open joint round the frame lets weather in. Left, water can reach the timber and the wall so renewing it early protects the window. In London conversions, one flat’s bathroom is often above another flat’s ceiling, and a slow leak from a failed seal can end up in the flat below. Dealing with it early is far simpler.
There are no prices on our website, because the cost depends so much on the job itself. For a quick quote, please call 0345 464 0079 or send us an email and we will talk you through it.
Why New Cross clients choose us
- Neat joints and a tidy finish
- 4.9 on Google from 180+ five-star reviews
- Full insurance on every job
- Experience in homes, commercial sites and hotels
Read what affects the cost or what customers say.
Looking after it afterwards
Aftercare is simple, and it makes a real difference:
- Don’t run silicone over sand mastic
- Ask a joiner to look at soft timber first
- Leave the new mastic unpainted
- Ask the planning authority about consent for listed or conservation-area homes
Avoid painting over the new mastic, which is the traditional advice. If you are redecorating, ask us first.
Renewing mastic before redecorating saves doing it twice. Paint over cracked mastic only covers it up.
Signs you need sand mastic in New Cross
Most of it is simply age. Sand mastic is a maintenance item like any pointing, depending on exposure and upkeep.
Signs it’s time to call us include:
- Mastic dropping out of the joint
- Cement or filler used on old window joints that has cracked
- Wind and rain getting in round a sash window
- Mastic worn away on windows facing the weather
In the older streets around St James's Church, the joint between an old wall and a newer frame is generally the first place rain gets in.
Questions to ask before booking
- Whether the sealant suits the joint
- What preparation is included
- Whether VAT is included
- How long the guarantee is
Common questions in New Cross
I let a flat near New Cross station. Can you help?
Yes, we work for landlords and letting agents. Just ring 0345 464 0079 or drop us an email and tell us about the property, and we’ll give you a clear price.
Can parking be tricky for a visit in New Cross?
Parking in New Cross, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
Will there be a smell?
It depends on the product. Some products have a noticeable smell, others very little.
Does someone need to be in?
Access is agreed with you when the job is booked. For inside work, that normally means someone being in.
What should I tell you?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
Do you come to New Cross?
Yes. We work in New Cross and the rest of Greater London. For a quote, phone 0345 464 0079 or drop us an email.
Do you guarantee sand mastic work?
You get our 12-month guarantee on every job.
Are you an approved applicator?
Yes. We’re approved under the ARBOMaster scheme.