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

Facade and window perimeter sealing in Charlton, Greater London

Facade joint and window perimeter sealing on commercial buildings in Charlton and across Greater London. CHAS accredited, Constructionline member, with a 12-month guarantee on workmanship.

  • Sealant pulling away from frames or panels
  • Unsightly perimeter sealant on a visible elevation
  • Failed seals around shopfront and entrance frames
1
Send details
Tell us about the site, with photos if you have them.
2
Get a quote
One fixed quote covering the agreed scope.
3
We seal
CSCS-carded applicators, the right product for each joint.
4
Guaranteed
Backed by a 12-month workmanship guarantee.
Covering the South East & Scotland
CHAS & Constructionline
Fully insured: £5m PL

Facade sealing across Charlton

Share the site address and what’s failing, and we’ll reply with a fixed quote or arrange a visit.

Why act early in Charlton

The longer a failed joint is left, the more the substrate suffers: edges get wet, render and timber deteriorate and frames can move. Early action keeps it simple. Access in London is hard enough to arrange once, so it makes sense to deal with every failing joint while access is in place.

A quote for facade joints depends on how many there are, their condition and the access, plus any specification you are working to. Ask us for a fixed quote.

Why clients in Charlton choose us

  • Work carried out by CSCS-carded applicators
  • Specification-led, product-correct work
  • One contact handling all your sites
  • Workmanship guaranteed for 12 months

See our cost guide or our accreditations.

About our facade sealing in Charlton

Water ingress at window frames is a frequent reason facilities managers contact us. Very often the perimeter bead has cracked or lost its grip, but not always. We’ll tell you if we think the leak is coming from somewhere sealant won’t fix. Site teams most often ask us about cladding panel joints that have opened up and patch repairs that keep failing, across stone and brick facade joints, perimeter joints where frames meet the structure and window and door perimeters. Searching for sealant specialists in Charlton? We’ve been sealing commercial buildings since 2005, CHAS accredited and a Constructionline member.

A great deal of London construction is refurbishment of occupied or part-occupied buildings, alongside new blocks. New frames, overcladding and fit-outs all end in perimeter and facade joints, frequently with occupants close by, so tidy, well-planned work matters.

The 12-month guarantee is for workmanship rather than wear and tear. Sealant wears with time, and movement, weather, cleaning and use decide how fast, so we spell out the cover before we begin.

Place
Charlton (SE7, SE18)
Wider area
Greater London
Cover
A 12-month guarantee
Quotes
Fixed quote, scope in writing
Telephone
01277 525 020
Updated
3 November 2026
The Mastic Doctor team beside their liveried vans in front of an office building

Questions we are asked in Charlton

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. Share the building’s contractor rules and we’ll work to them. All of Greater London is inside the ULEZ, and our planning allows for it

Can you work on a hospital site such as Queen Elizabeth Hospital?

Yes, hospitals are one of the sectors we cover. Before anything starts, the estates team agrees permits, inductions and infection-control measures with us.

Can you work in cold or wet weather?

Wet joints or temperatures outside the product’s range mean waiting. We plan for weather and keep you updated as the work goes on.

Which sealant will you use?

If the job is specified, we follow the specification. Otherwise, we recommend a product to suit the joint’s movement, the substrate and the conditions, following the manufacturer’s guidance.

Can you fit around our working hours?

Give us your site hours and any access windows in your enquiry, and we’ll schedule the work to suit. You can reach the office between 8am and 5pm, Monday to Friday.

Does weather matter for sealant work?

Outside, yes. Sealant needs a dry joint and a temperature within the product’s range, so frost, rain or cold mornings can delay outside work. Inside work is seldom held up.

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.

Diagnose, treat, sign off

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 anything from a single day to several weeks, depending on joint lengths, access and the weather, and our waste is bagged and taken away as we go. All of Greater London is in the ULEZ, and kerbside space in Charlton can be scarce. If there’s a loading bay, a car park or a permit we can use, tell us when you send details.

  1. First we review photos, drawings or what we saw on a visit, and agree how each joint will be reached.
  2. The old bead is cut away completely, not overlaid.
  3. Joint faces are cleaned to firm, sound material, with primer where the sealant maker specifies it.
  4. Backing rod, or bond-breaker tape in shallow joints, limits the depth.
  5. The new sealant goes in and is tooled firmly onto both faces.
  6. The completed runs are checked with you, then the 12-month guarantee applies.

Getting the site ready

  • For older buildings, check the asbestos register before work
  • Point out parking and an unloading spot
  • Let us know about inductions and permits

Getting a fixed quote

Pricing a project or setting a maintenance budget? Send the scope and any drawings, and we’ll return a fixed quote you can plan around. For a chat about it beforehand, call the office on 01277 525 020 or email drawings and photos.

Ask for a quote

Read more

Aftercare for building managers

Every sealant joint needs some looking after, and their life depends on movement, exposure, cleaning and use. Our advice:

  • Inspect facade joints on a regular cycle
  • Clear debris that holds water against joints
  • Keep the sealant details on the building file
  • Keep pressure washers away from fresh sealant

Following storms, look inside for damp or staining near frames. An early report typically means a small reseal rather than a bigger repair.

Get the joint design right when resealing: correct depth, proper backing and a sealant that can take the movement. Repeating a faulty detail just repeats the failure.

Surface by surface

Window and door perimeters

Frame materials vary, and so does the preparation. We clean and prime to the sealant maker’s guidance for each surface.

Brick and stone facades

Brick and stone facades have perimeter and movement joints that need a compatible sealant. Neutral-cure products are used because acetoxy types can mark some stone.

New build and refits around Charlton

As part of Greater London, Charlton is inside the ULEZ, which applies to every van on site. Deliveries are booked and storage is tight, so mastic materials come in as needed. The area within 2 miles of Charlton holds a good number of hotels. Hotel refurbishments often run to tight programmes between busy periods, and perimeter and sanitary sealant has to keep up.

New units and refits on sites such as Stone Lake Retail Park (less than half a mile north-west of Charlton) need their panel and perimeter joints sealed to the specification. For contractors at a college like Shooters Hill Sixth Form College, which lies south-east of Charlton, perimeters and internal sealant are timed for the holidays. On a campus such as Ravensbourne University London, 1.7 miles to the north-west of Charlton, new teaching buildings and residences are usually built and refurbished around the academic year.

Charlton is about 2 miles west of Plumstead, in Greater London. If you’re looking for facade sealing in Charlton, we can help, as we do across Greater London. Charlton is one of 764 places we cover in Greater London. There’s a separate page for London, roughly 6 miles from Charlton.

Business premises anywhere in SE7 and SE18 are within our area for facade joints. Among the streets we cover are Floyd Road, Guild Road and Priolo Road. We also cover New Charlton (1 mile north-west), Westcombe Park (1 mile west), Woolwich (1 mile east), Vanbrugh Park Estate (1 mile south-west) and Kidbrooke (2 miles south) for facade joints. Bigger towns within reach include 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 (6 miles north-west).

What’s near Charlton

Around Charlton, our work takes us to commercial buildings near Charlton Park, Wildwood Montessori School and Royal Greenwich Trust School, among other places. There’s a railway station in Charlton itself: Charlton station. Nearby you’ll also find British Hospital for Mothers and Babies (0.5 miles east) and Gallions Reach Shopping Park (2.3 miles north-east). Not far away are Gilbert's Pit.

Map of Charlton © OpenStreetMap contributors

When something else is needed

We check first that sealant really is the fix. It won’t put right:

  • Joints too narrow for the movement they take, which need redesign
  • Leaks from roofs, gutters or failed flashings rather than sealant joints
  • Providing access systems for the work

Not sure which it is? You can speak to us on 01277 525 020 or email a schedule or drawings and we’ll tell you honestly before you book.

Joints and surfaces we work on

  • Cladding panel joints
  • Coping and flashing joints
  • Stone and brick facade joints
  • Perimeter joints where frames meet the structure
  • Window and door perimeters
  • Shopfront frames

How the quote is worked out

These are the things that shape the price:

  • Removal of failed or old sealant
  • The size and state of each joint
  • Quantities, in metres or numbers
  • Site requirements such as inductions and permits

Larger quantities, tricky access or phasing all shape the price. So do site requirements such as inductions and permits.

Sending details for a quote

There’s no need for a formal survey. A few details are enough to get going:

  • Rough lengths or quantities, or drawings if you have them
  • When you need the work done
  • Access details, including height
  • Specification clauses that apply

Every quote starts with the facts: the joints involved, quantities, access and the product called for. Share whatever details you have and we will fill any gaps with a visit.

Accreditations

Trusted. Accredited. Insured.