Kent · England
External & façade joints in St Margarets, Kent
Sealing brickwork movement joints, render, cladding and façade joints in St Margarets, with a one-year guarantee on every job. Call for a quick quote.
- Failed sealant between panels on a façade
- Water getting into walls through failed joints
- Cracked joints where brick meets render or frames
External mastic in St Margarets, done properly
Movement joints let brickwork, render and cladding expand and shrink without cracking. Its sealant has to flex with the building, season after season, so once it splits or hardens, the joint stops working and water gets in. If you have panel joints letting water in and weeds or debris growing in open joints, we can put it right.
Somewhere as small as St Margarets, homes and farm buildings often face open ground, so walls and rooflines take the full force of wind and rain. Joints on those walls need a sealant that moves with the building and stays in place.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Location
- St Margarets (DA4)
- Wider area
- Kent
- Guarantee
- A year, on every job
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
What we do, step by step
A visit follows a simple pattern: we check the joints, mask and protect the surrounding surfaces, carry out the job and clear up. Most jobs take anything from a few hours to several days, depending on the building. In a small place like St Margarets, access is usually the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We start by checking each joint, agreeing the ones to redo and how we will reach them.
- Old sealant and any debris are cut and raked out.
- We clean both faces of the joint and prime them where the product calls for it.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Preparing for the visit
- Let us know if you’ve seen damp or leaks
- Mention any parking rules near the property
- Tell us about any previous sealing or DIY attempts
Ask for a quote
Need a quote? Please phone 0345 464 0079 or email us and tell us about the job. We’ll explain what we’d do and send you a clear quote before any work starts.
Related advice
Also near St Margarets
Also in St Margarets
Honest limits
Before booking, it’s worth knowing the limits too:
- Cracks in the bricks or render themselves, away from the joints
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Movement that is more than a sealant joint can take
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we’ll tell you honestly.
Joints and surfaces we work on
- Render & cladding joints
- Concrete & block
- Copings & trims
- Brickwork movement joints
- Joints between brick and frames
- Façade panels
Walls and rooflines in St Margarets
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Lullingstone Castle (about 4.5 miles south-west) are a reminder that the area around St Margarets has older buildings as well as new. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material.
If you let a flat or house near Farningham Road station, split movement joints are easy to miss on a rental until damp shows inside. Homes close to Church of St Margaret of Antioch include some older properties, and an extension built onto an older house moves differently, and the joint between them takes the strain.
St Margarets is about 3 miles south-east of Dartford, in Kent. Homes, rented property, offices and hotels in St Margarets can book us for external mastic. The work is guaranteed for a year. St Margarets is one of 922 towns and villages in Kent we cover for external mastic. You can also see our page for London, about 16 miles away.
Postcode districts we cover here for external mastic: DA4. Neighbouring places we cover for external mastic include South Darenth (1 mile south-west), Darenth (1 mile north), Green Street Green (1 mile east), Sutton at Hone (1 mile west) and Grubb Street (1 mile east). Larger places within reach include Maidstone (15 miles south-east), Dartford (3 miles north-west), Sevenoaks (9 miles south), Gravesend (5 miles east), Tonbridge (15 miles south) and Northfleet (4 miles north-east).
Landmarks near St Margarets
Around St Margarets, our work takes us to homes and buildings near Darenth Country Park, Leigh Academy and Fox & Hounds pub. The closest station to St Margarets is Farningham Road station, about 1.1 miles south-west of the centre. Nearby you’ll also find Stone Museum of Geology (2.5 miles north) and Darent Valley Hospital (1.7 miles north). The countryside around St Margarets includes Sawyers Lake and Wansunt Pit.
Leave it or put it right?
An open joint keeps letting water into the wall with every downpour. Wet masonry is more easily damaged by frost, so the damage spreads beyond the joint. Around St Margarets, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs, plus any working-time requirements on site. Call for a quick quote and we’ll go through it with you.
Why book with us
- Anti-fungal sanitary silicone in wet areas
- White, clear, grey or another colour, product permitting
- 4.9 on Google from 180+ five-star reviews
- Fully insured
Take a look at what affects the cost or our reviews.
What affects the cost of external mastic
We quote each job individually. These are the things that affect it:
- Whether the work is at height
- When we can work, for business premises
- The number of rooms or windows
- Whether there’s mould to deal with
Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
What we need to know
Photos by email are helpful but not essential. Try to tell us:
- How many joints, rooms or windows are involved
- Any access issues, like height or stairs
- The type of property
- The problem you’ve noticed
Getting a quote is simple: let us know the job and the location and its rough size. Photos by email help us understand the job, and we will come back to you with a quote.
Work for landlords, hotels and businesses
Hotels need rooms back in use, so we plan the work room by room. Hotel work is part of what we do, alongside homes and businesses.
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we will give you a quote.
FAQs for St Margarets
Can you do external mastic in St Margarets?
Yes, St Margarets is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or drop us an email and tell us what needs doing.
Will you come out to St Margarets?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Which products do you use?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We’ll tell you what we are using and why.
How do I get a quote for external mastic in St Margarets?
The cost depends on the size of the job, access and how much old sealant has to come out. Call for a quick quote and we will talk you through it.
How long before the joint can be used?
Different products cure at different speeds, so follow the cure time we give you when we finish.
Do you work for landlords and businesses?
Yes. Domestic, commercial and hotel work are all part of what we do.
Will the new joint stand out?
The aim is a neat, even joint in a colour that suits the wall. Colour is agreed with you before we begin from the range available.
Is there a guarantee?
Yes: twelve months. If there’s a problem with our work in that time, tell us and we will put it right.
Signs you need external mastic in St Margarets
Some movement joints have been pointed up with mortar by mistake. With the joint locked solid, the movement turns into cracks elsewhere in the wall.
Keep an eye out for any of the following:
- Rigid filler in a joint that should flex
- Moss and dirt in joints with no sealant left
- Cracked joints where brick meets render or frames
- Brick movement joints where the sealant has split
Schools such as Greenlands Primary School are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
What to look for in a quote
- Who turns up on the day
- Which colour the sealant will be
- How the joint is cleaned and prepared
- What product goes in the joint
Keeping the joints in good condition
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Check external joints each spring
- Keep high-pressure jets off the joints
- Make sure movement joints aren’t pointed over
- Have failed joints looked at early
Only paint over the joint if we’ve confirmed the sealant can take paint. Many exterior sealants are not designed to be painted and spoil the finish.
If you can see gaps, plants or bare sections in a joint, have it checked. Early work is quicker and leaves a better finish.