The Mastic Doctor team standing beside their branded vans outside an office building
Greater London · England

New Charlton commercial sealant contractors

Work needed on a sealant joint in New Charlton? We look at it, seal it with the right product and hand it over with a 12-month guarantee.

  • Expansion joints with the sealant torn out
  • Gaps behind commercial kitchen worktops and sinks
  • External beads that have gone brittle and cracked
1
Send details
Send the specification, photos or a marked-up plan.
2
Get a quote
One fixed quote covering the agreed scope.
3
We seal
The right sealant, to the right depth, neatly finished.
4
Guaranteed
Backed by a 12-month workmanship guarantee.
London, the South East & Scotland
CHAS & Constructionline
Fully insured: £5m PL

Need commercial sealant contractors in New Charlton?

Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.

How we handle commercial sealant contractors in New Charlton

How long a joint lasts is decided before any sealant leaves the gun. Silicone has no grip on cured silicone, so the failed bead is cut out completely, then both faces are cleaned back to sound, dry material with no dust or grease on them. Where the sealant maker specifies a primer for that substrate, it goes on before the new bead and the joint depth is controlled with backing rod. If you have weathered facade sealant that no longer flexes and expansion joints with the sealant torn out, we can help, whatever the surface. Facilities teams, main contractors and managing agents in New Charlton tend to want the same three things: a fixed quote, no surprises on site and a 12-month guarantee behind the result.

We price commercial jobs in New Charlton from photos, drawings or a site visit, with the scope listed so everyone knows what’s included.

Much of the planning for a London commercial job is about getting in and out: booked loading, goods-lift times, the permit system and a place to stage materials. Once that’s settled, the sealant joints are resealed in sections so tenants are disturbed as little as possible.

What our 12-month guarantee covers is the way we did the job: preparation, application and finish. It doesn’t extend to damage, other trades’ later work or movement the joint was never designed to take.

Where
New Charlton (SE7, SE18, E16)
Region
Greater London
Guarantee
12 months on our workmanship
Quotes
Quoted before any work starts
Telephone
01277 525 020
Updated
3 November 2026
The Mastic Doctor team beside their liveried vans in front of an office building

Commercial premises in New Charlton

A 2-mile radius around New Charlton takes in plenty of hotels. A hotel refurbishment is full of joints that guests will see, and a matched colour keeps them discreet. New Charlton has at least three named business or industrial parks inside a 3-mile radius. Tenant changes on such sites bring fit-outs, and fit-outs bring new joints; brand colours often come into it.

For premises near Charlton station, under half a mile south-west of New Charlton, footfall is part of the plan: work is phased so shops and offices keep trading. New Charlton is inside London’s ULEZ, as is the rest of Greater London; tell us about loading bays, goods lifts and parking when you send details.

New Charlton is about 2 miles north-east of Greenwich, in Greater London. Anywhere in SE7, it works the same way: details in, fixed quote out, then sealing and a 12-month guarantee. Our Greater London coverage takes in 764 places, from busy centres to rural villages. We also cover London, around 6 miles from New Charlton.

Business premises anywhere in SE7, SE18 and E16 are within our area. Streets here include Floyd Road, Priolo Road and Hasted Road, and sites on any of them can send details for a fixed quote. Nearby places we also cover include Charlton (1 mile south-east), Westcombe Park (1 mile south-west), Woolwich (1 mile east), Vanbrugh Park Estate (1 mile south-west) and Maze Hill (2 miles south-west) for sealant joints. Further afield, our area takes in London (6 miles west), City of Westminster (8 miles west), Marylebone (8 miles west), Kensington (10 miles west), St Pancras (7 miles west) and Shoreditch (5 miles north-west).

Near you in New Charlton

We work on buildings around Thames Barrier Park, Thorntree Primary School and The Victoria pub and the streets around them. There’s a railway station in New Charlton itself: Charlton station. Nearby you’ll also find Charlton Athletic Museum (less than half a mile south) and Greenwich Castle (1.9 miles south-west). For a walk, there’s Gilbert's Pit.

Map of New Charlton © OpenStreetMap contributors

Your questions answered

Can you work at a site such as Stone Lake Retail Park, by New Charlton?

Yes. We cover New Charlton and the area around it, including industrial estates, business parks and retail parks such as Stone Lake Retail Park. Send details of the unit and the work through our quote form for a quick quote.

Can you work in a London building with booked loading and goods-lift slots?

Yes, we plan every London job around the building’s own access rules. Say when the building is occupied and when it’s quiet, and we’ll plan accordingly. All of Greater London is inside the ULEZ, and our planning allows for it

Which site documents can you send us?

We will confirm the paperwork you need, such as RAMS, an insurance certificate or CSCS details, with the quote. We’re CHAS accredited and a Constructionline member, with five million pounds of public liability insurance.

Does weather matter for sealant work?

For external joints, yes. The joint has to be dry and within the product’s temperature range, so damp, frosty or very cold days can stop external work. Internal work is rarely affected.

What guarantee do you give on resealing?

A 12-month guarantee covers the workmanship. Looking after the joints as we advise helps them last.

Do you cover New Charlton?

Yes. New Charlton is in our area. To discuss a job, give us a call on 01277 525 020 or email a schedule or drawings.

How long before the joints can be used?

Curing time varies by product, and we confirm it on the day, and flag anything to keep off until it has cured.

Diagnose, treat, sign off

We follow your site rules from the start: sign-in, induction and whatever permit system the building uses. With the paperwork done, the joints are worked through in the order agreed with your site contact, and each area is checked before we leave it. All of Greater London is in the ULEZ, and kerbside space in New Charlton can be scarce. Let us know about any on-site parking or loading arrangements when you send the job details.

  1. First, details reach us through the quote form or a site visit.
  2. The cause is diagnosed and the scope priced as a fixed quote.
  3. Where parts of the building must stay open, the work is phased.
  4. Old sealant is cut out completely, never sealed over.
  5. A suitable product for each joint goes in at the right depth and is tooled.
  6. A final walk-round, then the 12-month guarantee applies.

What we need from you

  • For older buildings, check the asbestos register before work
  • Clear stock, furniture or equipment away from the joints
  • Tell us what induction or permit system the site runs

Ask for a quote

A handful of photographs and a postcode is the fastest way to a quote. Send them through the quote form, or call the office on 01277 525 020 or email drawings and photos if you’d rather talk the job through.

Ask for a quote

Advice

Should maintenance staff do it?

Site maintenance staff can often handle a short internal joint. Where it goes wrong is preparation: sealing over old material, sealing onto damp or dusty surfaces, or a product that can’t take the movement.

Some joints are best left to specialists: fire-rated seals that must follow a tested detail, trafficked floor joints and external movement joints among them. A poor seal in places like these tends to cost more to put right later.

What sets the cost

These are the things that shape the price:

  • The size and state of each joint
  • Site requirements such as inductions and permits
  • Phasing around occupants
  • The product specified

Quantities, awkward access and phased working all shape the price. Site requirements like inductions and permits play a part as well, along with the time of year for external work.

What to include in your enquiry

Whether it’s one area or a whole building, these details speed things up:

  • Any specification or named product
  • Asbestos survey details if the building is older
  • Whether the building will be occupied during the work
  • Approximate linear metres or a joint schedule

Specifications, drawings and tender packages are welcome with any enquiry, and we’ll price against exactly what is specified. Smaller jobs need nothing more than photos and a few notes.

What the job involves on each surface

Washrooms and toilets

Mould that has grown into washroom sealant can’t normally be cleaned out. Replacement is the fix: strip, clean, dry and reseal.

Facade and cladding joints

On a facade, a failed joint is often only visible close up. Close-up photographs or a site visit tell us what’s needed, with colours confirmed for the product chosen.

After the work

A few simple habits keep the new joints working:

  • Add sealant to the planned maintenance inspection list
  • Keep abrasive pads and scrapers off resealed joints
  • Make sure contractors see the asbestos survey before cutting out old mastic
  • Deal with small splits before they become leaks

Keep an eye out for other trades after we’ve gone. When fittings are moved or cabling added, the sealant nearby is easily disturbed and the joint gets left open. If that happens, phone 01277 525 020 or use the quote form and we will price putting it right.

Tenants and staff spot black or split sealant quickly, and it reflects on how the building is run. Replacing it on a planned cycle keeps complaints down.

When to call us in New Charlton

External sealant takes a steady beating from the weather. Sunny elevations dry the surface out and exposed ones take driving rain, so beads chalk, stiffen and lose their stretch. A hardened bead can’t follow the building any more.

Typical triggers for a call:

  • Wall and floor joints that have lost their seal
  • Untidy joints in a reception, shop floor or lobby
  • Weathered facade sealant that no longer flexes
  • Gaps behind commercial kitchen worktops and sinks

In hotels such as London City Airport Hotel, 1 mile to the north-east of New Charlton, refurbishments usually mean bathroom, bar and reception joints where a matched sealant colour has to sit with the finishes.

Before you book anyone

  • Is the sealant right for the movement and the substrate?
  • Will CSCS-carded applicators be on site?
  • Is depth set with backing rod, or bond-breaker tape in shallow joints?
  • What site paperwork they can supply

Choosing a commercial sealant contractor

Accreditations

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