Buckinghamshire · England
Lamport External Mastic
External mastic in Lamport from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Sealant that has lost its bond to the brick or render
- Moss and dirt in joints with no sealant left
- Hard, crazed mastic that has stopped moving
External mastic for homes and businesses in Lamport
On houses, flats and commercial buildings across Lamport, we reseal joints in brickwork, render, cladding and façade panels. The preparation is the same whatever the wall: clean, sound faces and a controlled depth. Typical jobs include water getting into walls through failed joints and joints where the bead has come unstuck, across render & cladding joints, joints between brick and frames and concrete & block.
Older homes in small places like Lamport may be stone, brick or timber-framed, often with later extensions. Where one material meets another is where water normally gets in.
Each job carries a 12-month guarantee.
- Where
- Lamport (MK18)
- Region
- Buckinghamshire
- Guarantee
- A year, on every job
- Price
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Common questions in Lamport
Is external mastic in Lamport guaranteed?
Every job comes with our one-year guarantee, wherever it is. We’re also fully insured and ARBOMaster approved.
Is Lamport within the area you cover?
Yes, Lamport is covered. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Why is there a gap in my brick wall?
Brickwork, render and cladding all move a little, so long walls have planned gaps to take that movement. It’s closed with backing rod and a flexible sealant.
Can I add another job to the visit?
Yes, and it often makes sense. Combining jobs makes good use of the visit, so mention them when you ask for a quote.
Do the sealants smell?
Possibly a little. Any smell clears as the sealant cures, and ventilation helps.
Which products do you use?
Each joint gets the product that suits it. Movement, water and weather all affect the choice, and we’ll tell you what we are using.
Should I try DIY first?
That depends on the joint. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional, while a short indoor joint may be within reach.
Will the old sealant be removed?
Yes. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
Leave it or put it right?
It often makes sense to reseal all the failing joints on an elevation together. Joints of the same age tend to fail together, and access only has to be arranged once. Around Lamport, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
The cost reflects the work involved, not a rough estimate. That is why we ask about the job first.
Why us?
- We agree the colour with you first
- Domestic, commercial and hotel work
- Trusted Arbo and Everbuild sealants
- 20+ years of sealant experience
Take a look at what affects the cost or what customers say.
External mastic in Lamport: local notes
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Historic houses like Stowe House (about 0.9 miles west) are a reminder that the area around Lamport 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.
Managing a site like Akeley Wood Senior School? Then movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Lamport is about 2 miles north of Buckingham, in Buckinghamshire. Across the MK18 area, our applicators can take on external mastic. We cover 263 towns and villages across Buckinghamshire, large and small. There’s also a page for Oxford, roughly 22 miles from Lamport.
Jobs for external mastic in MK18 works the same way as everywhere else we cover. We also cover the places around Lamport: Akeley (1 mile east), Maids Moreton (1 mile south-east), Lillingstone Lovell (3 miles north-east) and Leckhampstead (3 miles east). We also work in nearby towns such as Haydon Hill (15 miles south-east), Winslow (8 miles south-east), Steeple Claydon (6 miles south), Tingewick (3 miles south-west), Whitchurch (12 miles south-east) and Quainton (11 miles south).
Around Lamport
We work in homes and buildings around Buckingham School, Stowe Park and Garden and The Queen's Head pub, among other places. Well-known places in the area include The Menagerie (0.9 miles west) and Buckingham Castle (2.2 miles south). Open spaces near Lamport include Buckingham Sand Pit.
What sealant work cannot fix
We’d rather tell you now than do work that will not last, so here’s what sealant cannot put right:
- Render that’s blown, hollow or coming away
- Structural movement, which needs a surveyor or engineer
- Cutting new joints into brickwork, which is building work rather than sealant work
If in doubt, phone 0345 464 0079 or send us an email and we’ll say what we think before you book.
What we seal
- Brickwork movement joints
- Façade panels
- Joints between brick and frames
- Copings & trims
- Render & cladding joints
- Concrete & block
How to look after the new joints
After the cure time, these simple habits help:
- Act on the first splits you see
- Never let anyone fill a movement joint with mortar
- Wash walls gently around the sealant
- Ask before painting over external sealant
Have a quick look at the joints each spring. Watch for splits, edges coming away or growth in the joint.
If you can see gaps, plants or bare sections in a joint, have it checked. Earlier resealing means a smaller job and a better result.
Nearby places to Lamport
Also in Lamport
Signs you need external mastic in Lamport
Poor preparation causes many early failures: joint faces that were dusty or damp, unprimed where they needed it, or still carrying old sealant. The sealant never bonds properly.
Keep an eye out for these signs:
- Joints pointed up with cement by mistake
- Movement joints with cracked, split or missing sealant
- Weathered mastic that no longer stretches
- Rain getting behind render or cladding at a joint
In the older streets around Parish Church of St Mary, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Comparing quotes
- Is VAT in the price?
- When the joint can take water or movement
- Are they insured?
- How the colour is chosen
What affects the quote in Lamport
For a quick quote, just ask. The main things that affect it are:
- The type of sealant required
- Whether the work is at height
- When we can work, for business premises
- How many rooms, windows or areas are involved
A few things move the cost up or down: the old material and how easily it comes out, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
What we need to know
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- Whether it has been sealed before
- How we’d reach the joints
- What the problem is, such as mould, gaps, leaks or cracking
- Roughly how big the job is
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we will explain how we’d tackle it. When it suits you, phone 0345 464 0079 or send us an email.
Landlords, agents and businesses in Lamport
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we’ll give you a quote.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
The process
We bring everything the job needs with us, so there’s nothing for you to buy. After a quick look at the joints together, the area is protected and the work begins. Most jobs take a few hours for a handful of joints, longer for a whole elevation. Somewhere like Lamport needs a little journey planning: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Getting ready for the visit
- Let us know about stairs, lifts or work at height
- Let us know about earlier repairs to the joints
- Clear items away from the joints we’re working on
Getting a quote
For external mastic in Lamport, ring 0345 464 0079 or email us. Tell us what the problem is and where, and we will agree the price before any work begins.