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

Facade Sealing in Erith

Facade joint and window perimeter sealing on commercial buildings across Erith, by CSCS-carded applicators. CHAS accredited and fully insured.

  • Air leaks through failed facade joints
  • Cladding panel joints that have opened up
  • Water coming in around window frames
1
Send details
Tell us about the site, with photos if you have them.
2
Get a quote
A fixed quote for the work, with the scope in writing.
3
We seal
The right sealant, to the right depth, neatly finished.
4
Guaranteed
Signed off, with 12 months’ guarantee.
South East, London & Scotland
CHAS & Constructionline
£5m PL insurance

Facade sealing for businesses in Erith

Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.

How we handle facade sealing in Erith

Some clients need every window on a block resealed; others need a few leaking frames sorted. Either way, the method is the same: cut out, clean, back, prime where needed and seal. Each job carries our 12-month guarantee. If you have failed seals around shopfront and entrance frames and sealant pulling away from frames or panels, we can put it right. For commercial sealant work in Erith, you deal with one contact from quote to sign-off, for single jobs and planned programmes alike.

Construction in a London area such as Erith means working on constrained sites: limited storage, booked deliveries and access shared with other trades. We fit around the programme, sealing each elevation or floor as other trades hand over.

Every job is signed off with a 12-month guarantee. The promise is simple: if the work we did fails within twelve months, we return to fix it.

The Mastic Doctor team standing beside their branded vans outside an office building
Place
Erith (DA8, DA17, DA7)
Region
Greater London
Cover
A 12-month guarantee
Quotes
Quoted before any work starts
Phone
01277 525 020
Page updated
3 November 2026

Work for main contractors and building owners

Housing associations and managing agents often need work done across blocks and communal areas. Work can be phased so residents and staff keep access throughout, with each stage agreed with your site contact.

CHAS accredited and a Constructionline member, we make supplier vetting simple. Our insurance certificate can be sent along with the quote.

Keeping the joints sound

Your facilities or cleaning team can help the joints last. Pass these on to them:

  • Inspect facade joints on a regular cycle
  • Record the product and colour used on each elevation
  • Report water ingress at frames as soon as it shows
  • Avoid harsh cleaners on facade sealant

Let the new sealant cure before washing the facade or windows near it. Pressure washers and harsh cleaners can damage a fresh bead and tell your cleaning contractor.

Planned resealing is cheaper than reacting to leaks. Regular checks let you renew joints before water gets in instead of after the damage.

Mastic packages on Erith sites

As part of Greater London, Erith is inside the ULEZ, which applies to every van on site. Add booked deliveries and tight storage, and the mastic package needs planning with the site team.

On a campus such as University of Greenwich Avery Hill Campus, which lies south-west of Erith, new teaching buildings and residences are typically built and refurbished around the academic year. For contractors at a school such as Christ Church (Erith) CofE Primary School, sealing has to be finished before term starts. New wings at hospitals like Erith and District Hospital (to the south-west of Erith) bring long runs of window and panel joints to seal.

Erith is about 3 miles north-west of Dartford, in Greater London. We send applicators to Erith for facade joints, handled exactly as we handle every other area. Erith is one of 764 places we cover in Greater London for facade joints. Our London page has more on work in that area.

Work on facade joints is covered throughout DA8, DA17 and DA7, for business premises of every kind. Among the streets we cover are Church Road, Town Square and Erith High Street. Close to Erith, our area also takes in Northumberland Heath (1 mile south), Bexley Riverside (1 mile south), Belvedere (1 mile north-west), Lessness Heath (1 mile north-west) and Barnehurst (1 mile south). Nearby towns on our patch include London (11 miles west), City of Westminster (14 miles west), Marylebone (14 miles west), St Pancras (13 miles west), Shoreditch (11 miles west) and Walthamstow (11 miles north-west).

Near you in Erith

In Erith, that means premises near Trinity School, The Cross Keys pub and Erith School, among other places. There’s a railway station in Erith itself: Erith station. A little further out are Erith Museum (less than half a mile east) and Erith and District Hospital (under half a mile south-west). The countryside around Erith includes Crossness Nature Reserve.

Map of Erith © OpenStreetMap contributors

From enquiry to sign-off

When we get to site, we sign in, go through any site induction and check how permits are handled. Everything around the joints gets protected before any cutting starts, with the work itself normally taking longer on a full elevation than on a handful of window perimeters, and it always depends on dry weather. Planning a London job such as one in Erith starts with access: 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.

  1. We start with photos, drawings or a visit to see the joints and agree access.
  2. Product choice follows the joint’s movement and substrate.
  3. Failed beads are removed in full and the joint faces cleaned.
  4. Primer goes on where the product data asks for it.
  5. Backing rod is fitted and the new sealant gunned in and tooled.
  6. The finished joints are checked with you.

Preparing the site

  • Send your site hours and access windows
  • Confirm the product named in the specification
  • Explain the parking and delivery arrangements

Quotes

Tell us about the building, the joints and when you need the work done, and a fixed quote will follow. To get it moving, call 01277 525 020 or use the quote form.

Get a quick quote

Advice

What we can’t put right

Part of a good diagnosis is knowing where sealant stops. You’ll hear from us if the cause turns out to be any of the following:

  • Movement beyond what any sealant can handle
  • Damp caused by condensation inside the building
  • Specialist high-level access methods

If in doubt, phone 01277 525 020 or email us and we will say what we think.

Where we work in Erith

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

Should maintenance staff do it?

For a quick touch-up, site staff may be fine, but larger jobs are different: a specialist works through quantities efficiently, leaves a consistent finish and backs it with a 12-month guarantee.

What you see is the finished bead, but most of the work is hidden. Correct depth, the right primer and a sealant matched to the movement are where general trades tend to cut corners.

Your questions answered

Can you work at a site such as Madford Trade Park, by Erith?

Yes. Estates, retail parks and business parks around Erith, Madford Trade Park among them, are all within reach. Photos and a short description are enough for a first look.

Can work at a site such as University of Greenwich Avery Hill Campus fit around teaching?

Yes. Tell us the term dates, vacation periods and access windows, and we’ll plan the work around them. Any paperwork you need, from RAMS to our insurance certificate and CSCS details, is confirmed with the quote.

Do you provide access for facade work?

That comes down to the access arranged for the job. When you speak to us on 01277 525 020 or send photos by email, describe the access, and we will plan the work with you.

Do we need an asbestos check before resealing?

For older buildings, yes, check before work starts. The dutyholder holds the asbestos register, so ask for it before we start. Suspect material is left alone until it has been tested.

Does weather matter for sealant work?

It can, when the joints are outside. Sealant won’t bond properly to a wet or frosty joint, so we watch the forecast and rearrange outside work if we have to. Internal work is far less affected.

Is it fine to apply new sealant on top of old?

No. Failed sealant is removed and the faces cleaned back to sound, dry material first, because fresh silicone will not bond with aged silicone.

How do we ask for a quote?

The quote form is the simplest route, though you can also phone 01277 525 020 or email the details over. Include photographs or drawings if you have them.

What the job involves on each surface

Cladding panel joints

Panel joints on cladding and rainscreen systems take movement every day. We use a product rated for the movement and suited to the panel surface, as the specification sets out.

Window and door perimeters

Frames grow and shrink with temperature, and the perimeter joint has to follow. Rod placed at the right depth lets the bead stretch as the frame moves.

Accreditations

Trusted. Accredited. Insured.