Greater London · England
New Build Mastic in Hither Green
Professional new build mastic in and around Hither Green, with every bit of old sealant taken out first and a 12-month guarantee.
- Sealant applied over dusty or wet surfaces
- Sealant work across a run of new homes
- New-build shower sealant that has already split
What affects the quote in Hither Green
We don’t publish a price list, because no two jobs are the same. The quote depends on:
- Which sealant suits the joint
- How easy the joints are to reach
- Whether there’s mould to deal with
- Whether old sealant or filler has to be cut out
Instead of a standard rate, we look at what your job involves: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
What we need to know
You do not need to know the technical terms. It helps if you can tell us:
- Any previous sealing or DIY work
- The address or postcode of the job
- A few pictures by email, if you can
- How many joints, rooms or windows are involved
Asking for a quote is easy: tell us what needs doing and where and its rough size. Photos by email help us understand the job, and we will come back to you with a quote.
How we handle new build mastic in Hither Green
Our new-build work comes in two parts: plot mastic for developers, and putting right failed sealant for people who’ve bought a new home. In both, preparation makes the difference since hurried prep is behind a lot of new-build failures. If you’re dealing with gaps opening as the house dries out and settles and untidy sealant flagged on a snagging list, we can put it right.
New flats are going up across London, many of them in larger developments. Snagging there often goes through the developer or managing agent, and shower seals that fail early, skirting joints that open up and gaps at thresholds are all common snags.
A 12-month guarantee comes as standard.
- Where
- Hither Green (SE13, SE12, SE6)
- Wider area
- Greater London
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Why act early in Hither Green
For developers, getting the sealant right first time saves return visits. Every return visit for a failed seal takes time, and they’re avoidable with good preparation. Converted houses in London often have a bathroom above someone else’s living room, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Putting it right early is much less trouble.
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.
Why Hither Green clients choose us
- Anti-fungal silicone where joints get wet
- Arbo and Everbuild products
- ARBOMaster approved applicator
- Fully insured
Read how sealant jobs are priced or our reviews.
The process
On the day, we start by going over the job with you, so you know exactly what we are doing. Surfaces next to the work are protected before we start. Most jobs take a few hours for most snagging lists, longer for a run of plots. For a job in Hither Green, 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 start by agreeing which joints are on the list, from the snagging sheet or plot schedule.
- We cut out every bit of the failed or messy sealant.
- We clean off dust from the build and prime the surfaces where the product needs it.
- New sealant suited to each joint is applied and tooled neatly.
- Finally, each room is checked and you are given the cure time.
Before we arrive
- Try not to wet indoor joints just before the visit
- Let us know about stairs, lifts or work at height
- Let us know about parking restrictions
Get a quote
For a quick quote, get us on the phone, or email us if that is easier. Describe what needs sealing and we will explain what’s involved before giving you a price.
Advice
For landlords and businesses
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
For anyone letting property in or around Hither Green, jobs at different addresses can be quoted together. Send us the addresses and the work at each, and pictures by email help.
When it isn’t the sealant
It helps to know what we can’t do:
- Structural cracks in walls or ceilings
- Baths and trays that move too much for sealant to cope with
- Damaged fittings that need replacing
If you’re not sure, just ring 0345 464 0079 or drop us an email and we will give you a straight answer.
Where we work in Hither Green
- Windows & doors
- Bathrooms & en suites
- Skirting & floors
- Plot handovers
- Kitchens
- Show homes
Joints and finishes in Hither Green homes
Much of London’s new housing is flats in larger developments, where snagging may go through the developer or managing agent. Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For new homes near Hither Green station, it’s worth checking the sealant early, while snags are still fresh.
Hither Green is about 2 miles south-east of New Cross, in Greater London. We carry out new build mastic for homes and businesses in Hither Green and nearby, as part of our work across Greater London. Hither Green is one of 764 towns and villages in Greater London where we work.
Our applicators cover all of the SE13, SE12 and SE6 postcode area for new build mastic and the streets around it. If you need new build mastic at a property on Old Road, Manor Lane and Pascoe Road or anywhere close by, we can help. We also cover the places around Hither Green: Lee (1 mile east), Ladywell (1 mile west), Lewisham (1 mile north-west), Catford (1 mile south-west) and Horn Park (1 mile east). We also work in nearby towns such as London (5 miles north-west), City of Westminster (8 miles north-west), Marylebone (8 miles north-west), Kensington (9 miles west), St Pancras (7 miles north-west) and Shoreditch (6 miles north-west).
Landmarks near Hither Green
We work in homes and buildings around International Academy of Greenwich, The Edmund Halley pub and Manor House Gardens. Hither Green has its own railway station: Hither Green station. Well-known places in the area include Lewisham Shopping Centre (0.9 miles north-west) and University Hospital Lewisham (0.7 miles west). For a walk, there’s Brookmill Road Local Nature Reserve and Summer Hill.
Also in Hither Green
Hither Green: your questions answered
Can you help a landlord with a rental near Hither Green station?
Yes, we work for letting agents and landlords. You can ring 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before work begins.
Is Hither Green in your area for new build mastic?
Yes. We work across London and the South East, and Hither Green is part of that. You can phone 0345 464 0079 or send us an email and let us know what needs doing, and we’ll give you a clear price.
Where are you based?
Mr Mastic is based in Crawley. We cover Hither Green and the rest of Greater London.
Do you remove the old sealant?
Yes. We cut out all the old sealant and clean the joint before resealing.
Can you reseal over the builder’s sealant?
No. Sealing over old sealant looks fine for a few weeks, then lifts. All the old sealant comes out before work begins.
Should I go to my builder first?
Report it to the builder first while you’re covered. If it is not resolved, we’ll cut it out and reseal it.
How long before the joint can be used?
Different products cure at different speeds, so follow the cure time we give you.
How do I get a quote for new build mastic in Hither Green?
The cost depends on the size of the job, access and how much old sealant has to come out. Call for a quick quote.
Aftercare tips
Aftercare is simple, and it makes a real difference:
- Report sealant problems to your builder during the snagging period
- Keep water off fresh sealant until it has cured
- Open a window or run the fan after bathing
- Record problems with dated photos
Wipe the sealant with warm soapy water. Avoid abrasive pads and strong solvents, which can damage the surface.
Report failed sealant to the builder while you’re in the snagging period. Once it ends, the repair may be down to you, so raise it early.
Do you need new build mastic in Hither Green?
Fresh sealant can be knocked or cut by trades finishing off. If it’s disturbed before curing, the joint can be left weak and it shows once the home is in use.
The problems people normally mention when they call are:
- Shower seals failing in the first year or two
- Internal frame sealant that has split
- Gaps between new skirting and floors
- Untidy sealant flagged on a snagging list
Hither Green is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Before booking anyone
- The length of the guarantee
- How long to leave it before use
- Which sealant they’ll use, and why
- What insurance they hold