Round Street mastic sealing
Mastic sealing for building owners, managing agents and housing associations in Round Street. CHAS accredited, Constructionline member, with a 12-month guarantee on workmanship.
- The same joint failures repeated across a portfolio
- Open joints in brickwork or panels
- Cracked, hardened mastic round windows on a block
Mastic sealing in Round Street
Share the site address and what’s failing, and we’ll reply with a fixed quote or arrange a visit.
Honest limits
A few problems need another trade or a different fix, and we say so rather than covering them up:
- Leaks through the frame itself rather than the perimeter
- Cracked or crumbling render, brick or stone at the joint edges (we’ll tell you if so)
- Old mastic suspected of containing asbestos, which must be tested and dealt with by a specialist first
Not sure which it is? You can speak to us on 01277 525 020 or email us and we’ll tell you honestly before you book.
What we seal
- External wall and movement joints
- Balcony and threshold joints
- Window and door perimeters on blocks
- Shopfronts below residential blocks
- Communal kitchens and washrooms
- Communal entrances and stairwells
Mastic sealing in Round Street
Across Round Street and the rest of Kent, we work the same way: you send details, we return a fixed quote, the joints are resealed and the 12-month guarantee follows. A list of buildings, a few photos and approximate joint numbers are enough for a quick quote, and site visits can be arranged. If you are dealing with patchy repairs in mismatched sealant and the same joint failures repeated across a portfolio, we can put it right, on shopfronts below residential blocks, window and door perimeters on blocks and balcony and threshold joints alike. Searching for sealant specialists in Round Street? We’ve been sealing commercial buildings since 2005, with CSCS-carded applicators.
Owners and agents with buildings around smaller places such as Round Street tend to manage small terraces of association properties, converted barns and commercial units. Mastic around frames and on external joints wears out in time, whatever the building.
Every job we finish is backed by a 12-month workmanship guarantee, wherever the site is. If a joint we sealed fails because of how it was installed, we come back and put it right.
- Where
- Round Street (DA13)
- Wider area
- Kent
- Guarantee
- A 12-month guarantee
- Price
- Quoted before any work starts
- Call
- 01277 525 020
- Updated
- 3 November 2026
Round Street: questions and answers
Is Round Street too small for you to travel to?
Not at all. Round Street is within our area. London and every South East county are within our area. Good photographs up front let us bring everything on the first visit.
Is Bowes Industrial Centre, near Round Street, within your area?
Yes, sites like Bowes Industrial Centre are within our area, along with the rest of Round Street. Photos and a short description are enough for a first look.
How do I request a quote?
There are four steps: send details, receive a fixed quote, we carry out the work, and it’s guaranteed. The first step only needs photographs and a postcode.
What if the old mastic contains asbestos?
Asbestos removal isn’t part of our work. If old sealant is suspected, work stops until it’s tested in line with the dutyholder’s asbestos management.
How do you reach windows on upper floors?
It depends on the building. How upper joints are reached is agreed before work is booked so the fixed quote reflects it.
Is it fine to apply new sealant on top of old?
No. Overlaying old sealant is a frequent cause of early failure, so everything comes out first.
Can weather delay the job?
For external joints, yes. The joint has to be dry and within the product’s temperature range, so frost, rain or cold mornings can delay outside work. Inside work is seldom held up.
How a job runs
Before any cutting starts, the area is protected: masking tape along the joint edges and sheeting over anything nearby. On site, the work usually takes a day or two for a single block, longer for an estate programme, and our waste is bagged and taken away as we go. Jobs in and around smaller places like Round Street are usually planned as a single visit, so we ask for photographs and rough sizes first. That way the right products come on the day.
- A building-by-building inspection lists the failed joints.
- The quote is fixed and split as suits you.
- We agree the programme and dates with you.
- Failed sealant is removed and the faces prepared.
- New sealant goes in with backing rod and primer where needed.
- We check the finished work and confirm the guarantee.
What we need from you
- Let us know about inductions and permits
- Send your site hours and access windows
- Agree which areas must stay open
Getting a fixed quote
Tell us about the building, the joints and when you need the work done, and we’ll put a fixed quote together. To get it moving, phone 01277 525 020 or send photos by email.
Advice
Towns and villages near Round Street
Other services in Round Street
Signs you need mastic sealing in Round Street
Buildings move with temperature and moisture, and the sealant takes up that movement. If the joint or the product wasn’t suited to the movement, it splits long before it should.
If one of these sounds familiar, it’s time for a closer look:
- Cracked, hardened mastic round windows on a block
- Movement joints with sealant missing
- The same joint failures repeated across a portfolio
- Occupiers reporting cold air round windows
Schools and community buildings such as Cobham Primary School need frame and external mastic kept sound like any building.
Questions to ask before you book
- How long is the guarantee, and what does it include?
- Their pre-qualification and accreditations
- How they’ll work around occupants
- The named product and why it was chosen
Keeping the joints sound
Sealant joints are maintenance items, and how long they last depends on how they’re treated. Our advice:
- Have the asbestos survey to hand for older buildings
- Start inspections with the most exposed faces
- Avoid piecemeal callouts where you can
- Log resealing dates block by block
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.
Failed mastic often goes unnoticed until heavy rain finds it. Resealing when cracking first shows avoids water damage and the complaints that come with it.
Cost factors for mastic joints
To price the job, we consider:
- Distance, for remote addresses
- Whether old sealant has to be cut out first
- Working within restricted access windows
- How accessible the joints are
A quote for mastic joints depends on quantities, condition and access, and any specification that applies. Ask us for a fixed quote.
Details that help us quote
To price the job accurately, we need to understand the site. Send us:
- Where the site is, with the postcode
- Rough lengths or quantities, or drawings if you have them
- When you need the work done
- A wide shot and a close-up of the area
Specifications, drawings and tender packages are welcome with any enquiry, and we will price the work to it. Smaller jobs need nothing more than photos and a few notes.
Frames, entrances and external joints in Round Street
Central London is about 22 miles from Round Street. Within reach of London, blocks run by agents and associations are common around stations. Round Street sits in one of the drier corners of the country, the South East. Outside mastic still needs a dry joint and the right temperature, while the elevations that take the most sun tend to show hardened mastic first.
Historic properties like Cobham College, 0.9 miles east of Round Street, show the age of some local stock, where frame mastic must suit soft brick or stone. Trustees of buildings like St Mary's Room can bring frame and external mastic into a planned maintenance list.
Round Street is about 3 miles south of Gravesend, in Kent. We cover Round Street and the rest of Kent, with the same fixed quotes and 12-month guarantee as everywhere else. Round Street is one of 931 places we cover in Kent for mastic joints. Our London page has more on work in that area.
Business premises anywhere in DA13 are within our area. Sites close to Round Street are covered too, including Sole Street (1 mile south), Gold Street (1 mile south-east), Nash Street (1 mile west), Meopham (1 mile south-west) and Henley Street (1 mile south-east). Bigger towns within reach include Maidstone (11 miles south-east), Dartford (8 miles north-west), Sevenoaks (11 miles south-west), Gravesend (3 miles north), Tonbridge (14 miles south) and Northfleet (3 miles north-west).
Around Round Street
Around Round Street, our work takes us to commercial buildings near The Railway Inn, Jeskyns and Meopham School and the streets around them. Round Street’s nearest station is Sole Street station, roughly 0.6 miles south of the centre. Other landmarks nearby include Gravesham Museum (3.5 miles north) and Gravesham Community Hospital (3.6 miles north). The countryside around Round Street includes Gad's Hill and Ranscombe Farm.
Different surfaces, different methods
Planned maintenance
Planned resealing replaces emergency callouts and keeps budgets predictable.
Tenement and older buildings
Older mastic can contain asbestos, so we check the asbestos register or survey first. Suspect material is tested before work continues.