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

Facade and window perimeter sealing in Bonnington, Kent

Sealant work in Bonnington for main contractors, managing agents and facilities managers: facade joint and window perimeter sealing on commercial buildings, quoted at a fixed price.

  • Air leaks through failed facade joints
  • Staining on stone next to old sealant
  • Perimeter joints where frames meet the structure
1
Send details
Drawings, photos, a joint schedule or a site visit.
2
Get a quote
Scope agreed and priced before anything starts.
3
We seal
Prepared joints, the specified product, a tidy finish.
4
Guaranteed
12-month guarantee on our workmanship.
Covering the South East & Scotland
Constructionline member
£5m PL insurance

Facade sealing for Bonnington sites

Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.

How we handle facade sealing in Bonnington

Facade joints are the line of defence between the weather and the building fabric. Once a perimeter seal fails, water tracks in around frames and panels. We remove failed sealant and install a new bead chosen for the joint and how far it moves. If you are dealing with damp patches beside frames after rain and patch repairs that keep failing, we can put it right, on stone and brick facade joints, coping and flashing joints and shopfront frames alike. A single leaking joint is often how a building in Bonnington first comes to us: we look at the rest while we’re there and tell you what we find.

For a site near Bonnington, the mastic visit is planned so the right sealants, primers and backing rod are on hand. Drawings, photos and the programme let us give a fixed quote.

Every job is signed off with a 12-month guarantee. It’s a plain promise: 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
Bonnington (TN25)
Wider area
Kent
Cover
12 months on every job
Price
Fixed quote, scope in writing
Phone
01277 525 020
Updated
3 November 2026

Your questions answered

Can you work at a site such as Bliby Business Centre, by Bonnington?

Yes, sites like Bliby Business Centre are within our area, along with the rest of Bonnington. Send details of the unit and the work through our quote form for a quick quote.

Can you take on a job at a hospital such as William Harvey Hospital?

Yes, healthcare and care buildings are part of our work. Before anything starts, the estates team agrees permits, inductions and infection-control measures with us.

Will you quote for a small job?

Whatever the size, the process is the same: details, then a fixed price, then sealing, then a 12-month guarantee.

Are you fully insured?

Yes. We are fully insured, including public liability cover.

Is the work guaranteed?

Yes, for 12 months. If a joint fails because of how we installed it, we come back and put it right.

Is it okay to overlay old mastic?

No. New sealant won’t hold on old sealant, so the old bead is cut away and the joint cleaned back to sound material. Nothing else gives a bond that lasts.

Is colour matching possible?

That depends on the product. Some ranges are wide, others limited, so we will confirm the colours available for the specified product with the quote.

Commercial clients in Bonnington

Planned maintenance programmes are welcome: resealing failed joints building by building, on a schedule that suits your budget. Bonnington can form part of a wider programme.

CHAS accredited and a Constructionline member, we make supplier vetting simple. We are fully insured, and our insurance certificate can go with the quote.

Surface by surface

Cladding panel joints

Where panels are sealed rather than open-jointed, the bead is part of the weather line. Failed runs are cut out and rebuilt end to end with backing and a facade-grade sealant.

Coping and flashing joints

Where the specification calls for sealant at copings or flashings, we can seal them. These joints take full exposure to weather, so preparation and product choice matter.

New build and refits around Bonnington

Bonnington lies roughly 53 miles out from central London. Commuter-belt towns tend to see a steady flow of new flats, offices and commercial schemes, and each scheme needs its mastic sealed to programme. The South East is one of the drier parts of the UK. Winter mornings still bring frost and condensation on frames and panels, so external mastic is timed for workable conditions and agreed with the site manager.

Units on estates such as Bliby Business Centre, 1.8 miles north-west of Bonnington, tend to be reclad and refitted as tenants change, and each job leaves cladding and perimeter joints to seal. Hospital estates such as William Harvey Hospital (to the north of Bonnington) tend to grow and change in phases, often next to occupied wards, so facade and perimeter sealing has to fit the estates team’s plan. When a school such as Aldington Primary School is extended or refurbished, the mastic package is often squeezed into the holidays.

Bonnington is about 5 miles south-east of Ashford, in Kent. Businesses, contractors and managing agents in Bonnington can call on us for facade joints. Our Kent coverage takes in 931 places, from busy centres to rural villages. Our Brighton page has more on work in that area, about 49 miles away.

Postcode districts covered here: TN25. Streets here include Cherry Orchard Lane and Bourne Road, and sites on any of them can send details for a fixed quote. Sites close to Bonnington are covered too, including Aldington (1 mile north-east), Clap Hill (1 mile north-east), Aldington Frith (1 mile north-west), Stonestreet Green (1 mile north-east) and Postling Green (1 mile east). Further afield, our area takes in Ashford (5 miles north-west), Canterbury (15 miles north-east), Folkestone (10 miles east), Hythe (7 miles east), Hawkinge (10 miles east) and Wincheap (14 miles north-east).

Near you in Bonnington

Locally, jobs take us to sites close to Poulton Wood and Walnut Tree Inn. Bonnington’s nearest station is Ham Street station, roughly 3.6 miles west. Well-known places in the area include William Harvey Hospital (3.8 miles north) and Lympne Castle (4.2 miles east). Not far away are Hatch Park.

Map of Bonnington © OpenStreetMap contributors

Our process

We bring the products specified for the job, along with primers and backing rod. Joint faces are cleaned back to sound, dry surfaces, the manufacturer’s primer is applied where it’s called for, and the sealant is tooled off neatly. For a building around Bonnington, tell us how to find it and who will meet us. Send that with the details and we will confirm the plan with the quote.

  1. We start with photos, drawings or a visit to see the joints and agree access.
  2. We confirm the joint type, movement and the specified product.
  3. The existing bead comes out in full.
  4. Primer is applied where the maker specifies it.
  5. Backing rod is fitted and the new sealant gunned in and tooled.
  6. We go over the completed work with you before leaving.

Preparing the site

  • Share your working hours and any access restrictions
  • Point out parking and an unloading spot
  • Let us know about inductions and permits

Getting a fixed quote

A handful of photographs and a postcode is the fastest way to a quote. Upload them with the quote form, or speak to us on 01277 525 020 or email drawings and photos to discuss it first.

Ask for a quote

Advice

Maintenance after handover

For the best life from the joints:

  • Brief window cleaners about newly sealed joints
  • Avoid patch repairs on failed facade joints
  • Add perimeter sealant to planned maintenance checks
  • Plan facade sealing alongside redecoration

Keep gutters, sills and drainage paths clear. Sealant copes better when water runs off the facade as designed rather than sitting against the joints.

Tie resealing in with redecoration, cladding repairs or other access. One set-up for several trades saves money.

What we can’t put right

Sealant solves a lot, but not everything, and we are upfront when that’s the case. These need a different solution:

  • Render or concrete edges that have broken away
  • Replacing glass or failed glazing units
  • Specialist high-level access methods

If you’re not sure, just phone 01277 525 020 or use the quote form and we will give you a straight answer before you book.

Joints and surfaces we work on

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

How the quote is worked out

These are the things that shape the price:

  • Phasing around occupants
  • Removal of failed or old sealant
  • Site requirements such as inductions and permits
  • Joint width, depth and condition

The product called for affects the cost, as does the preparation each joint needs, from cutting out to priming and backing rod. Access, phasing and site rules also count.

Details that help us quote

There’s no need for a formal survey. These details are enough to start:

  • The product your specification calls for
  • Rough lengths or quantities, or drawings if you have them
  • How the joints are reached, and at what height
  • Photos of the joints, close up and from further back

We quote a fixed sum against the scope you give us, so the cost is agreed before work starts. To ask for one, call 01277 525 020 or send photos by email.

Accreditations

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