Buckinghamshire · England
External & façade joints in North Lee, Buckinghamshire
Sealing brickwork movement joints, render, cladding and façade joints in North Lee, with a one-year guarantee on every job. Call for a quick quote.
- Old sealant gone brittle and cracked
- Damp patches traced to an open external joint
- Joints pointed up with cement by mistake
External mastic in North Lee
Short cuts in external joints show up within a season or two. New sealant over old, joints packed with mortar and beads with no backing rarely last long. We strip the joint back and start again. If you have joints pointed up with cement by mistake and sealant pulling away from one side of the joint, we can put it right.
Somewhere as small as North Lee, homes and farm buildings often face open ground, where walls and rooflines take the weather head on. Joints on those walls need a sealant that moves with the building and stays in place.
We guarantee the work for a year. If something isn’t right with it in that time, tell us and we’ll put it right.
- Location
- North Lee (HP22)
- Wider area
- Buckinghamshire
- Guarantee
- 12 months on all our work
- Quotes
- A clear price before we start
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Quotes for external mastic in North Lee
We don’t publish a price list. The quote depends on:
- Any mould that needs treating
- The number of rooms or windows
- The size of the job
- Whether the work is at height
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs, along with when we can work on site. Call for a quick quote and we will explain what it covers.
Helping us quote
There’s no need for technical detail. Just tell us:
- How many joints, rooms or windows are involved
- Where the property is
- What’s wrong with the joints now
- Any access issues, like height or stairs
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we’ll explain what’s involved.
External mastic in North Lee: local notes
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For landlords with property near Stoke Mandeville station, outside joints that have cracked can let damp into a rental, so check them between lets. In the older streets around Church of St Mary, an extension built onto an older house moves differently, and the joint between them takes the strain.
North Lee is about 3 miles south of Aylesbury, in Buckinghamshire. From the centre of North Lee to the outskirts, external mastic is available for homes and businesses alike. 263 places in Buckinghamshire are on our list, from the larger towns to small villages. You can also see our page for Oxford, about 19 miles away.
Every address in HP22 is covered for external mastic. If you’re just outside North Lee, we cover Nash Lee (1 mile south-east), Terrick (1 mile south-east), Chalkshire (1 mile south-east), Stoke Mandeville (1 mile north-east) and Ellesborough (1 mile south). Within a short drive, we also cover Aylesbury (3 miles north), High Wycombe (10 miles south), Chesham (9 miles south-east), Marlow (14 miles south), Amersham (11 miles south-east) and Beaconsfield (13 miles south-east).
Local landmarks in North Lee
In North Lee, that means homes and buildings near The Mandeville School. For rail, the closest station is Stoke Mandeville station, about 1.1 miles north-east of the centre. Well-known places in the area include National Paralympic Heritage Centre (1.9 miles north) and Little Kimble Motte (1.7 miles south). Open spaces near North Lee include Brush Hill Local Nature Reserve and Beacon Hill.
Landlord and commercial work in North Lee
For anyone letting property in or around North Lee, several properties can go on one quote. Just tell us the addresses and what each one needs, and pictures by email help.
In hotels, rooms out of use cost money, so the work can be planned room by room around your bookings where we can. We have worked in hotels as well as homes and businesses.
What the job involves on each surface
Cladding and façade panels
Panels heat up and cool down quickly, so the joints work hard every day. We choose the product to suit.
Render joints
Rendered walls have joints at beads, openings and changes of material. We reseal them with a flexible exterior sealant that suits the render colour.
Keeping the joints in good condition
Looking after new joints is easy, and it makes a real difference:
- Keep soil, plants and ivy away from the joints
- Avoid pressure-washing directly into sealant joints
- Keep movement joints as flexible joints, not mortar
- Leave the joints unpainted unless we’ve said otherwise
Follow the cure time we give you before the joint is knocked or disturbed. The surface skins over quickly, but full cure takes longer.
Leave a failed movement joint and water keeps getting into the wall. That can lead to damp patches, staining and frost damage.
What we cannot put right
In fairness, there are a few things sealant won’t fix:
- Damp that is not coming from the joint
- Walls that need new movement joints cut into them
- Structural movement, which needs a surveyor or engineer
Not sure which it is? You can phone 0345 464 0079 or email us and we will tell you honestly before booking.
Joints and surfaces we work on
- Joints between brick and frames
- Render & cladding joints
- Concrete & block
- Brickwork movement joints
- Copings & trims
- Façade panels
What happens on the day
There’s no need to move everything out before we come, only the area right around the joints. We protect the rest, and the work takes a few hours for a handful of joints, longer for a whole elevation for a typical job. Somewhere like North Lee needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Getting ready for the visit
- Mention if the joints have been sealed before
- Keep pets and children clear of the area while we work
- Clear the area around the work
How to get a quote
Need a quote? Please call 0345 464 0079 or send us an email with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.
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FAQs for North Lee
I let a flat near Stoke Mandeville station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can call 0345 464 0079 or send us an email with the details for a clear quote.
Do you cover North Lee for external mastic?
Yes, North Lee is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or email us with a few details of the job, and we’ll send you a clear quote.
What is backing rod for?
Backing rod controls the sealant depth and keeps it off the back of the joint. Then the sealant bonds to two faces and can move.
Can you do several jobs on one visit?
Yes. Several rooms, windows or areas can go on one quote.
Is it OK to seal over old sealant?
No. New silicone won’t bond to old silicone, and anything trapped underneath, including mould and water, stays there. It all has to come out first.
Do you work for hotels and businesses?
Yes. Hotels, offices and other businesses use us, and we’re fully insured.
How much does external mastic cost in North Lee?
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’ll talk you through it.
Why is there a gap in my brick wall?
Most straight vertical gaps in brickwork are movement joints. It gives the wall room to move and needs a flexible seal, not mortar.
What we are called out for in North Lee
If plants are growing out of a joint, the sealant has usually failed or was never there. Roots and dirt hold water against the wall.
The problems people normally mention when they call are:
- Rain getting behind render or cladding at a joint
- Hard, crazed mastic that has stopped moving
- Weeds or debris growing in open joints
- Sealant that has lost its bond to the brick or render
Schools such as Stoke Mandeville Combined School are buildings too, and its movement joints, gutters and trims need looking after like any other building’s.
Questions to ask before booking
- Is VAT in the price?
- Whether the sealant suits the joint
- Who turns up on the day
- Are they insured?