Mastic sealing for building owners and managing agents in Erith, Greater London
Planning work on a mastic joint in Erith? We look at it, seal it with the right product and hand it over with a 12-month guarantee.
- Leaks at window and door perimeters
- Draughts at frames across a block
- Brittle perimeter mastic across a building
Mastic 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.
About our mastic sealing in Erith
We work for building owners, landlords with commercial or block portfolios, managing agents and housing associations. A planned, building-by-building programme often works better than reacting to each complaint, with each block quoted and scheduled in turn. Most enquiries involve a mix of products and colours from past repairs and communal area joints that look neglected, across external wall and movement joints, window and door perimeters on blocks and balcony and threshold joints. A specialist sealant contractor works differently from a general builder: in Erith, that means joint design, primers and backing rod as standard.
Planning mastic work on a London block means notices to residents, access to flats and agreed working areas. We work to the agent’s notice and access plan, so residents know what’s happening.
Our workmanship is guaranteed for 12 months, wherever the site is. If our installation lets you down in that time, we return and fix it.
- Location
- Erith (DA8, DA17, DA7)
- Wider area
- Greater London
- Guarantee
- 12 months on our workmanship
- Quotes
- Fixed quote, scope in writing
- Phone
- 01277 525 020
- Last updated
- 3 November 2026
Diagnose, treat, sign off
Diagnose, treat, sign off: every visit follows that pattern. First comes an inspection and agreement on scope, then the work is carried out to the specified product and detail, and the job ends with a walk round and sign-off. For a job in Erith, access comes first. Give us the hours we can be on site and we will schedule to suit.
- First we look at the mastic on each building and note what needs replacing.
- A fixed quote follows, split by block or building if that suits you.
- The programme is fixed with you, including dates you can pass on to residents or tenants.
- We remove the old mastic completely and clean the joint faces back.
- Backing rod and primer go in as the joint requires, then the new bead is placed and tooled.
- Each building is checked on completion and the work carries our 12-month guarantee.
Before we start on site
- Explain the parking and delivery arrangements
- Send asbestos survey details if the building is pre-2000
- Tell staff and tenants when we’ll be in
Getting a fixed 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’ll arrange a site visit if anything is unclear.
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Looking after buildings in and around Erith
For a London block, the agent or landlord normally handles notices to residents and access to flats. We fit the programme to your notice periods.
Student accommodation around universities such as University of Greenwich Avery Hill Campus, 4.6 miles south-west of Erith, is normally managed block by block, which suits a planned mastic programme. Churches, halls and community buildings such as Christ Church are looked after by trustees and committees like any other owner, and their frames, doors and external joints need mastic renewed in time.
Erith is about 3 miles north-west of Dartford, in Greater London. Our applicators travel to Erith for work on mastic joints. Erith is one of 764 places we cover in Greater London for mastic joints. We also cover London, some 11 miles away.
We take on mastic joints across the DA8, DA17 and DA7 postcode area, whatever the building. Buildings on Church Road, Town Square and Erith High Street are within our area for mastic joints. Nearby places we also cover include 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) for mastic joints. Bigger towns within reach 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).
Landmarks near Erith
Locally, jobs take us to sites close to Trinity School, The Cross Keys pub and Erith School and the streets around them. Erith has its own railway station: Erith station. Nearby you’ll also find Erith Museum (under half a mile east) and Erith and District Hospital (less than half a mile south-west). Not far away are Crossness Nature Reserve.
Do you need mastic sealing in Erith?
We often find joints filled solid with no backing rod so the mastic is bonded on three sides. That three-sided adhesion stops it stretching and splits as the building moves.
Things that typically lead to an enquiry:
- Failed external movement joints
- Repeated reactive repairs to the same buildings
- Brittle perimeter mastic across a building
- Water getting in round frames after rain
Site managers at schools like Christ Church (Erith) CofE Primary School can fit frame mastic into the summer works.
Before you book anyone
- Will RAMS and insurance details be available?
- Whether primer will be used where the manufacturer specifies it
- Their public liability cover
- Will failed sealant be removed rather than covered?
When something else is needed
A proper diagnosis includes knowing what sealant can’t do. We’ll tell you if the real problem is one of these:
- Old mastic suspected of containing asbestos, which must be tested and dealt with by a specialist first
- Misted or failed double-glazed units
- Water coming in from the roof or rainwater goods
If you are not sure, just ring 01277 525 020 or send details through our quote form and we will give you a straight answer before you book.
What we seal
- Balcony and threshold joints
- Communal kitchens and washrooms
- External wall and movement joints
- Shopfronts below residential blocks
- Communal entrances and stairwells
- Window and door perimeters on blocks
Nearby places to Erith
Also in Erith
Your questions answered
Do you work for managing agents with blocks near Erith station?
Yes. Managing agents, landlords, property factors and housing associations are who this service is for. We work to your notice and access arrangements.
Will you take on work at estates like Madford Trade Park, close to Erith?
Yes. Our area takes in Erith and its surroundings, with estates and business parks such as Madford Trade Park included. To start, just speak to us on 01277 525 020 or email a schedule or drawings with the unit, the joints involved and your access times.
How do you reach windows on upper floors?
Every block is different. We agree access with you at quote stage so there are no surprises.
Does the weather affect the 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.
Do you work to architects’ specifications?
Yes. Send it with your enquiry, and the quote will be based on it.
Do you seal on top of existing sealant?
No. Failed sealant is removed and the faces cleaned back to sound, dry material first, because fresh silicone will not bond with aged silicone.
When is resealing likely to be due?
There’s no fixed lifespan: movement, exposure, cleaning, traffic and the product all play a part. Treat them as maintenance items and inspect them regularly.
Building owners, agents and FMs in Erith
Blocks and communal areas make up much of the work for housing associations and agents. Work can be phased so residents and staff keep access throughout, and each stage is agreed with your contact.
If you look after buildings for someone else, you need clear quotes and clear reporting. We quote a fixed sum, confirm the scope and walk the finished work with you or your representative, plus a 12-month guarantee.
What sets the cost
Your fixed quote is built from the real scope. It takes account of:
- How much existing material needs removing
- Access and working height
- The size and state of each joint
- Induction, permit and paperwork requirements
Quantities, awkward access and phased working all shape the price. So do site requirements such as inductions and permits, along with the time of year for external work.
Details that help us quote
However big the job, the same details help:
- What the building is and how it’s used
- Approximate linear metres or a joint schedule
- Any dates the work must fit around
- Asbestos survey details if the building is older
Send us photographs, drawings or a joint schedule are often enough for a fixed quote. If the job needs a look first, we’ll arrange a site visit.
Looking after the joints
Sealant joints are maintenance items, and their life depends on movement, exposure, cleaning and use. We suggest:
- Log resealing dates block by block
- Avoid piecemeal callouts where you can
- Make it easy for occupiers to report draughts
- Include mastic in your cyclical inspections
If a joint we sealed fails within 12 months, tell us and we’ll look at it. After that, regular inspection keeps the programme on track.
One failed perimeter usually means others on the same building are close, so it pays to look at the whole elevation. Doing them together saves going back again and again.