Milton Keynes · England
North Crawley External Mastic
Professional external mastic in and around North Crawley, with every bit of old sealant taken out first and a 12-month guarantee.
- Joints where the bead has come unstuck
- Rigid filler in a joint that should flex
- Hard, crazed mastic that has stopped moving
DIY versus a professional finish
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it does not work out, we can still put it right.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
External mastic for homes and businesses in North Crawley
Many failed façade joints only get noticed once there’s a stain or a damp patch inside. We inspect them, agree which need doing and reseal with a weatherproof, flexible sealant in a matching colour. Common call-outs are for leaking joints around cladding and façade panels and weathered mastic that no longer stretches, across render & cladding joints, façade panels and joints between brick and frames.
Outside joints can only be sealed when they’re dry, so work in North Crawley is booked around the forecast. Tell us about access to all sides of the building, including outbuildings and garages.
Your job is guaranteed for a year, as with all our work.
- Location
- North Crawley (MK16)
- Wider area
- Milton Keynes
- Guarantee
- 12 months on all our work
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Also near North Crawley
Also in North Crawley
North Crawley buildings and the weather
Historic houses like Linford Manor (about 4.8 miles west) are a reminder that the area around North Crawley has older buildings as well as new. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For an older house near a landmark such as Church of St Firmin, the joints between older walls, newer extensions and the roofline need a sealant that can move.
North Crawley is about 3 miles east of Newport Pagnell, in Milton Keynes. Wherever you are in the MK16 postcode area, we can carry out external mastic at your property. 73 places in Milton Keynes are on our list, from the larger towns to small villages. We also work in Oxford, around 34 miles away.
All of MK16 is within our area for external mastic. Whether your property is on High Street, Bryans Crescent and Hackett Place or a nearby road, we can help. Other places close to North Crawley include Moulsoe (2 miles south-west), Salford (3 miles south), Broughton (4 miles south-west) and Kingston (4 miles south). We also work in nearby towns such as Milton Keynes (6 miles south-west), Bletchley (8 miles south-west), Newport Pagnell (3 miles west), Bletchley and Fenny Stratford (8 miles south-west), Furzton (8 miles south-west) and Whitehouse (8 miles south-west).
Near you in North Crawley
In North Crawley, that means homes and buildings near The Cock pub. Nearby you’ll also find Milton Keynes University Hospital (5.9 miles south-west) and Newport Pagnell Historical Society Museum (3.1 miles west). For a walk, there’s Tongwell Lake.
What the job involves on each surface
Brickwork movement joints
Brick moves with heat and moisture, and grows a little over time. The movement joint takes that up, so the sealant in it must stay soft and stretchy.
Render joints
Cracks along render joints let water in behind the coat. Resealing the joints early keeps water out and helps it last.
When to call us in North Crawley
A lot of failed joints come down to preparation: dusty or wet faces, no primer where one was needed, or old sealant left in. The sealant never bonds properly.
The most common problems we see are:
- Leaking joints around cladding and façade panels
- Cracked joints where brick meets render or frames
- Movement joints with cracked, split or missing sealant
- Sealant that has lost its bond to the brick or render
Managing a site like North Crawley CofE School? Then its movement joints, gutters and trims need looking after like any other building’s.
Comparing quotes
- What the cure time is
- Whether the sealant suits the joint
- Whether all the old sealant comes out first
- What happens if they find a problem under the old sealant
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 around the joint, so the damage spreads beyond the joint. Where a wall is exposed, as many are in small places like North Crawley, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
What you get with us
- A choice of colours where the product allows
- We never seal over old sealant
- One-year guarantee on every job
- 180+ five-star Google reviews
Read our cost guide or our reviews.
North Crawley questions
Can you do external mastic in North Crawley?
Yes, North Crawley is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or email us with a few details of the job, and we’ll give you a clear price.
Is external mastic in North Crawley guaranteed?
All our work, in North Crawley and everywhere else, comes with a 12-month guarantee. We are fully insured, and an ARBOMaster approved applicator.
Do you seal joints where cladding meets other materials?
Yes. Joints between dissimilar materials are a big part of external work. The sealant is chosen to bond to both sides with primer where required.
How often do external joints need resealing?
There’s no fixed answer: joints on exposed walls or with a lot of movement age sooner. Check them each year and reseal when they split or harden. Every job carries our 12-month guarantee.
Will the old sealant be removed?
Yes, always, and completely. New sealant won’t bond properly to old, so the joint is cleaned back first.
Do you hold any approvals?
Yes. We’re approved under the ARBOMaster scheme, which is run for the Arbo sealant brand.
Do you do commercial work?
Yes. Hotels, offices and other businesses use us, and we’re fully insured.
Will you leave a mess?
No. The area is protected while we work and cleaned up afterwards.
What we do, step by step
Our applicators work methodically: protect, prepare, seal, tidy. For most jobs that takes a few hours to a few days, depending on the length of joint and the access. For a village or hamlet like North Crawley, the journey is planned in advance: 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.
- First we look over the joints with you, agree which to renew and talk through access.
- We cut out the failed sealant and rake out any dirt or growth.
- Both sides are cleaned back to sound material and primed if needed.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Preparing for the visit
- Let us know about parking restrictions
- Try not to wet indoor joints just before the visit
- Mention any sign-in or site rules at work premises
Getting a quote
Getting a quote is simple: tell us what needs doing and where, and roughly how big it is. A few pictures by email make the job easier to understand.
Read more
Aftercare tips
After the cure time, these simple habits help:
- Leave the joints unpainted unless we’ve said otherwise
- Make sure movement joints are not pointed over
- Look over the joints every year, ideally after winter
- Have failed joints looked at early
Do not paint over the new sealant unless we have said the product is paintable. Many exterior sealants aren’t designed to be painted and spoil the finish.
Act while the splits are small. Then it’s a straightforward cut-out and reseal.
How we quote for external mastic
We do not publish a price list, because no two jobs are the same. The quote depends on:
- The number of rooms or windows
- When we can work, for business premises
- Whether there’s mould to deal with
- How much old sealant there is and how hard it is to remove
What you pay reflects the work, not a rough estimate. That’s why we ask a few questions first and give you a clear quote before we start.
Helping us quote
Photos help, but a description is a good start. Please mention:
- Where the property is
- What the problem is, such as mould, gaps, leaks or cracking
- Access, such as stairs, a lift or height
- Pictures of the joints, sent by email
For external mastic in North Crawley, call 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and we’ll agree the price before any work begins.