Mastic sealant contractors in Northfleet
Mastic sealing for building owners, managing agents and housing associations across Northfleet, carried out by CSCS-carded applicators. CHAS accredited and fully insured.
- Mastic failing across several blocks on an estate
- Water getting in round frames after rain
- Draught complaints from residents or tenants
Mastic sealing near Northfleet
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
How we handle mastic sealing in Northfleet
Owners and agents usually inherit a building’s mastic rather than choose it and it slowly wears out: it sits round windows and doors, along external joints and through communal areas. When it hardens, splits or pulls away, water and draughts follow, and occupiers start reporting it. We work on communal kitchens and washrooms, balcony and threshold joints and communal entrances and stairwells, and the failures we’re asked to look at most are estate-wide sealant that is simply worn out and failed external movement joints. Sealant contractors, mastic applicators, sealant specialists: whatever the job title on the order, the work in Northfleet is the same: failed joints cut out, faces prepared and the right sealant laid to the right depth.
Towns the size of Northfleet have a mix of blocks, flats over shops and small commercial buildings looked after by agents and landlords. Window and door perimeters, external joints and communal areas all need their mastic renewed from time to time.
Our workmanship is guaranteed for 12 months. If a joint we sealed fails because of how it was installed, we come back and put it right.
- Location
- Northfleet (DA11)
- Wider area
- Kent
- Guarantee
- A 12-month guarantee
- Quote
- A fixed quote before we start
- Phone
- 01277 525 020
- Last updated
- 3 November 2026
Diagnose, treat, sign off
Tell us your site hours and access windows and we will plan around them. On the day, the work area is kept contained and tidy, and your contact hears from us before we move to the next area. In a town such as Northfleet, most jobs are single buildings. We start with your photos, drawings or a site visit, then send a fixed quote.
- We inspect the joints, building by building, and record what has failed and why.
- You get a fixed quote, priced per building where that helps your budgeting.
- The programme is fixed with you, including dates you can pass on to residents or tenants.
- Failed mastic is removed and the faces taken back to sound, dry material.
- Backing rod and primer go in where the joint and the product need them, then new sealant is applied and tooled.
- Each building is checked on completion and the work carries our 12-month guarantee.
Getting the site ready
- Agree which areas must stay open
- Share your working hours and any access restrictions
- Arrange parking or a loading space
Get a fixed quote
Every quote starts with the facts: what’s there, how much of it, how we reach it and what’s specified. Send what you have, and we’ll arrange a site visit if anything is unclear.
Read more
What happens if it’s left?
Open external joints let water into walls and around frames. Damp patches, stained plaster and decorating claims can follow, which is harder to deal with than resealing. For businesses and landlords in Northfleet, a tidy, sound joint also matters for appearance. Fresh sealant makes a building look maintained.
What a job costs comes down to how many linear metres there are, how much old material needs removing and the access. Call for a quote when you’re ready.
Why us?
- One contact handling all your sites
- A fixed quote before work starts
- Products installed to the manufacturer’s instructions
- Fully insured, including public liability cover
Take a look at how commercial sealant jobs are priced or how we’re accredited.
How the job changes by surface
Window and door perimeters on blocks
Window and door perimeters are where most mastic failure shows. We remove the failed mastic, prepare the faces, add backing rod if the joint is deep and reseal.
Commercial and mixed-use buildings
Mixed-use buildings combine shops below with flats or offices above the programme has to suit everyone. Tell us your site hours and access windows and we’ll plan around them.
FAQs: Northfleet
Does a coastal location like Northfleet affect which sealant is used?
It can. Wind-driven rain and, closer to the shore, salt air are harder on external joints. We choose the product for the exposure, prime where the manufacturer requires it and size the joint for its movement.
Do you cover business parks and estates near Northfleet, such as Imperial Business Park?
Yes, sites like Imperial Business Park are within our area, along with the rest of Northfleet. To start, just ring 01277 525 020 or send details through our quote form with the unit, the joints involved and your access times.
How long do sealant joints last?
It depends on movement, UV and weather, cleaning, traffic and the product. Sealant joints are maintenance items, so inspect them regularly.
Is any job too small?
Whatever the size, the process is the same: details, then a fixed price, then sealing, then a 12-month guarantee.
Do you cover Northfleet?
Yes. We take on work across Northfleet, with one number for every area we cover.
Can you send RAMS and CSCS details before starting?
Our credentials include CHAS, Constructionline and public liability insurance. Tell us what site paperwork you need (RAMS, insurance certificate, CSCS details) and we’ll confirm with the quote.
Will you just go over the old sealant?
No. Sealing over old material is one of the classic causes of early joint failure, so everything comes out first.
Towns and villages near Northfleet
What else we do in Northfleet
What sets the cost
There’s no standard rate for sealant work, because every site is different. What we look at:
- Location, for remote and island sites
- Any access equipment needed
- Whether the work must be split into stages
- Joint width, depth and condition
Whether it’s a single area or a whole estate, the same things set the price: scope, access, product and programme. Call for a quote and we will put a fixed figure on it.
What to include in your enquiry
The more we know, the firmer the quote. When you get in touch, include:
- Where the site is, with the postcode
- Any dates the work must fit around
- Whether the building will be occupied during the work
- Access details, including height
Let us know the site, the scope and your timescale, and we will put a fixed quote together. The easiest way is to ring 01277 525 020 or email the details over.
Maintenance after handover
To get the most from the new sealant:
- Group repairs into a planned programme
- Ask residents or tenants to report leaks and draughts early
- Start inspections with the most exposed faces
- Check sealant joints during planned building inspections
Log the date and extent of the resealing for each block. It helps plan the next round and gives you a history.
Joints on a building age together so a single failure is a sign to check the rest. A planned reseal saves repeated visits.
What we can’t put right
A few problems need another trade or a different fix, and we point that out rather than sealing over them:
- Failed window or door frames, which need a window contractor
- Asbestos-containing sealant, which we don’t remove
- Masonry that has broken away beside the joint
Not sure which it is? You can speak to us on 01277 525 020 or email the details over and we will tell you honestly before you book.
What we seal
- Shopfronts below residential blocks
- Balcony and threshold joints
- External wall and movement joints
- Communal entrances and stairwells
- Window and door perimeters on blocks
- Communal kitchens and washrooms
Frames, entrances and external joints in Northfleet
Northfleet is within about 3 miles of the coast. Blocks and commercial buildings facing the sea take the most weather on their window perimeters and external joints; plan inspections around that. At about 20 miles from central London, Northfleet is within reach of the capital. Within reach of London, blocks run by agents and associations are common around stations.
Schools and community buildings such as Northfleet Technology College need frame and external mastic kept sound like any building. For owners of several units at places like Imperial Business Park, 0.9 miles north-east of Northfleet, one programme can deal with frame and external mastic across the lot. Owners of student blocks near University of Greenwich, 3.5 miles to the west of Northfleet, can schedule frame and external mastic for the summer vacation.
Northfleet is about 5 miles east of Dartford, in Kent. If you are looking for mastic sealing in Northfleet, we can help, as we do across Kent. Across Kent, 931 places are covered, including Northfleet. There’s a separate page for London, roughly 20 miles from Northfleet.
We take on mastic joints across the DA11 postcode area, whatever the building. Buildings on Lawrance Square, London Road and Marks Square are within our area for mastic joints. Main routes into Northfleet include the A2 and A226, which helps when planning parking and deliveries for the job. Sites close to Northfleet are covered too, including Painters Ash (1 mile south-west), Springhead (1 mile west), Windmill Hill (1 mile east), Northfleet Green (1 mile south) and Gravesend (1 mile east). Further afield, our area takes in Maidstone (14 miles south-east), Dartford (5 miles west), Sevenoaks (13 miles south-west), Swanley (8 miles west), Kings Hill (11 miles south) and Foley Park (13 miles south-east).
Landmarks near Northfleet
Around Northfleet, our work takes us to commercial buildings near The Six Bells pub, Saint George's Church of England School and Copperfield Academy and the streets around them. The closest station to Northfleet is Gravesend station, about 1 mile north-east. Other landmarks nearby include Bluewater (3.3 miles west) and Stone Castle (3.1 miles west). Not far away are Chafford Gorges Nature Park and Sawyers Lake.