Construction Mastic in New Eltham
Commercial sealant work in New Eltham for contractors, FMs and building owners: mastic packages for new-build and refurbishment projects, with a fixed quote first.
- Oversized or tapered gaps around new frames
- Bath and shower joints scraped during the final clean
- Different trades sealing to different standards
Construction mastic near New Eltham
Share the site address and what’s failing, and we’ll reply with a fixed quote or arrange a visit.
Do you need construction mastic in New Eltham?
On construction sites, joints typically fail early because of when they were sealed, not what was used. Sealing before decorators, flooring or other trades have finished leaves joints exposed to damage, and the joint has to be redone.
Any of the following is a good reason to get the joints checked over:
- Old sealant on a refurbishment that needs stripping before new work
- Window and door perimeters that won’t pass inspection
- Early adhesion failures on new external joints
- Bath and shower joints scraped during the final clean
Work at a hotel such as The Eltham Hotel (1.1 miles north of New Eltham) tends to be programmed around bookings, mastic included.
What your quote should include
- How joint depth will be controlled
- How long is the guarantee, and what does it include?
- Whether old or failed sealant will be cut out, not overlaid
- Who will actually carry out the work
Construction mastic in New Eltham, done properly
On refurbishments, the mastic package normally includes cutting out old sealant as well as sealing new work. Existing joints have to be stripped back to sound faces, because fresh sealant can’t key into cured silicone, and on older buildings we ask for the asbestos survey before disturbing anything. New and existing joints then get the same preparation. We work on cladding and panel joints, sanitary and kitchen joints and internal decorators’ caulk, and what we’re called in for most is early adhesion failures on new external joints and different trades sealing to different standards. A single leaking joint is often how a building in New Eltham first comes to us: we look at the rest while we’re there and tell you what we find.
Construction in a London area such as New Eltham means working on constrained sites: small compounds, delivery slots and shared hoists and scaffold. We fit around the programme, sealing each elevation or floor as other trades hand over.
Guaranteed is the last step of every job. You get a 12-month guarantee on our workmanship, and the quote explains what it covers.
- Location
- New Eltham (SE9, DA15, BR7)
- Wider area
- Greater London
- Guarantee
- A 12-month guarantee
- Quotes
- A fixed quote before we start
- Phone
- 01277 525 020
- Updated
- 3 November 2026
Sites and facades in and around New Eltham
Every borough of Greater London is inside the ULEZ, and that applies to contractors’ vehicles on any job in New Eltham. London sites also mean booked deliveries and limited storage, which the mastic programme has to allow for. New Eltham has several hotels close by, all within 2 miles. Hotel refurbishments often run to tight programmes between busy periods, and perimeter and sanitary sealant has to keep up.
Hospital estates such as Eltham Community Hospital, 1.1 miles north-west of New Eltham, tend to grow and change in phases, often next to occupied wards, so facade and perimeter sealing has to fit the estates team’s plan. Building work at universities like University of Greenwich - Avery Hill (0.7 miles north-east of New Eltham) is often timed for the summer, mastic included.
New Eltham is about 1 mile south-east of Eltham, in Greater London. If you are looking for construction mastic in New Eltham, we can help. New Eltham is one of 764 places we cover in Greater London. Our London page has more on work in that area, about 8 miles away.
We take on mastic packages across the SE9, DA15 and BR7 postcode area, for business premises of every kind. Streets here include Green Lane, Gerda Road and Novar Road. We also cover Eltham (1 mile north-west), Longlands (1 mile south-east), Coldharbour (1 mile south-west), Avery Hill (1 mile north) and Blackfen (1 mile north-east). Bigger towns within reach include London (8 miles north-west), City of Westminster (11 miles north-west), Marylebone (11 miles north-west), Kensington (13 miles west), St Pancras (10 miles north-west) and Shoreditch (9 miles north-west).
Near you in New Eltham
Around New Eltham, our work takes us to commercial buildings near Elmstead Wood and St Thomas More Catholic Comprehensive School, among other places. New Eltham has its own railway station: New Eltham station. Other landmarks nearby include Metropolitan Police Museum (1.4 miles east) and Eltham Community Hospital (1.1 miles north-west). The countryside around New Eltham includes Summer Hill and The Tarn.
What the job involves on each surface
Snagging before handover
Snagging is often the final mastic stage. We can work through the snag list area by area and damaged joints are redone rather than patched.
Kitchens and utility areas
Kitchen joints are sealed after fitting and before final clean. The sealant is a kitchen-grade product and hygienic or food-safe grades wherever food contact is possible.
When it isn’t the sealant
We seal joints; we don’t mend everything behind them. On its own, sealant can’t deal with:
- Glazing units that are cracked or misted
- Rework caused by others damaging completed areas
- Frame gaps too wide for sealant, which the installer needs to correct
Not sure which it is? You can give us a call on 01277 525 020 or send details through our quote form and we will tell you honestly before you book.
Surfaces we seal
- Floor and skirting junctions
- Sanitary and kitchen joints
- Cladding and panel joints
- Window and door perimeters
- Brick and block movement joints
- Internal decorators’ caulk
New Eltham: questions and answers
Is a hospital such as Eltham Community Hospital somewhere you can work?
Yes. Healthcare sites are among the places we work. Before anything starts, the estates team agrees permits, inductions and infection-control measures with us.
Do you cover business parks and estates near New Eltham, such as Green Lane Business Park?
Yes, sites like Green Lane Business Park are within our area, along with the rest of New Eltham. To start, just ring 01277 525 020 or use the quote form with the unit, the joints involved and your access times.
Can one quote cover more than one building?
Yes. We take on portfolio and planned maintenance work, with each site phased to suit its occupants.
What if there’s asbestos in the old mastic?
The duty to manage asbestos sits with the building’s dutyholder, so for older buildings we ask for the asbestos register first. If anything suspect turns up, we stop until it’s tested.
How long before the joints can be used?
The product and site conditions decide that. Some take light use quickly, others need longer to cure, and we confirm it before leaving site.
What’s the quickest route to a quote?
The quote form is the simplest route, though you can also speak to us on 01277 525 020 or email the details over. Photos, drawings or a joint schedule help us quote quickly.
Can you clear a mastic snag list before handover?
Yes. Snag-only work is something we take on, cutting out damaged or poor joints and resealing them.
On site: what to expect
Before any cutting starts, the area is protected: tape along each joint edge and covers over finishes, stock and equipment close by. The work itself typically takes as long as the agreed sequence needs, which comes down to joint lengths, access and handover dates, and we clear our waste as we work. For a job in New Eltham, access comes first: booked loading, goods lifts, the building’s permit system and a spot to keep materials. Send the building rules and access times with your enquiry.
- Drawings, specification and programme come to us.
- Quantities are measured and a fixed price returned.
- The sequence is agreed with the site manager.
- Plots or floors are sealed as they’re handed over.
- Every joint is cleaned, set to depth and sealed with the specified product.
- Snags are cleared and the package signed off with our 12-month guarantee.
Getting the site ready
- Explain the parking and delivery arrangements
- Flag any permit to work we’ll need
- Warn occupants and staff about the work
Ask for a quote
A good quote starts with a clear picture: the joints involved, quantities, access and the product called for. Send what you have, and we will arrange a site visit if anything is unclear.
Read more
What happens if it’s left?
Sealing over damaged or contaminated new joints might save a day, but it rarely lasts. Sealant can’t grip a contaminated or existing bead and the defect reappears in the defects period. We cut out and redo the joint properly. Access in London is hard enough to arrange once, so while access is arranged it pays to renew all failing joints, not just the worst.
Whether it’s a single area or a whole estate, the same things set the price: what’s in scope, how we reach it, what’s specified and when it needs doing. Call for a quote, and you will have a fixed figure to work with.
Why appoint us
- CSCS-carded applicators
- Matching to RAL references, product permitting
- Health and safety: CHAS accredited
- One number for every site we cover
Take a look at how commercial sealant jobs are priced or how we’re accredited.
Aftercare for building managers
After handover, these steps help:
- Keep product details for future maintenance
- Stick to the specified sealant rather than a generic substitute
- Allow flexibility for external sealing in damp or cold weather
- Share drawings and the specification as soon as possible
The package carries our 12-month guarantee for workmanship. Damage by others isn’t a workmanship fault.
One unsealed frame can let water into finished internal areas. That usually means redoing finishes in a completed area. Checking perimeters before internal finishes go on avoids it.