Hertfordshire · England
External & façade joints in Holwell, Hertfordshire
Movement joints in Holwell need attention? We remove the old material, prepare the joints and seal them properly.
- Failed sealant between panels on a façade
- Weeds or debris growing in open joints
- Joints pointed up with cement by mistake
External mastic for homes and businesses in Holwell
Low-level joints can normally be done from the ground. For joints higher up, give us some details of the building and we will confirm what access is needed. If you’re dealing with hard, crazed mastic that has stopped moving and joints with sealant missing in places, we can put it right, whatever the surface.
Outside joints can only be sealed when they’re dry, so work in Holwell is booked around the forecast. Let us know about access to every wall, plus any garages or outbuildings.
You get a 12-month guarantee, the same in Holwell as everywhere else we work.
- Location
- Holwell (SG5)
- Region
- Hertfordshire
- Cover
- 12 months on all our work
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
When something else is needed
We will not take on work that won’t last, so these are the limits:
- Cracking across the wall rather than at a joint
- Rising or penetrating damp from elsewhere in the wall
- Subsidence or other structural problems
If you are not sure, just phone 0345 464 0079 or email us and we will give you a straight answer before you book.
What we seal
- Concrete & block
- Render & cladding joints
- Brickwork movement joints
- Façade panels
- Joints between brick and frames
- Copings & trims
What the job involves on each surface
Concrete and blockwork
The face of concrete or block is often dusty, so cleaning and priming matter. A primer goes on where the product requires one before sealing.
Brickwork movement joints
Brick moves with heat and moisture, and grows a little over time. The movement joint takes that up, so its sealant has to stay flexible.
FAQs for Holwell
Do you cover smaller places like Holwell?
Yes, Holwell is covered. Our work covers London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Do you work for landlords with property near Hitchin station?
Yes, rental work is part of what we do. You can phone 0345 464 0079 or drop us an email with the address and a few details, and we’ll give you a fixed price before any work starts.
Are you an approved applicator?
Yes. We hold ARBOMaster approved applicator status, and we are fully insured.
Are you insured?
Yes. Full insurance covers our work.
Can you quote for more than one area?
Yes, and it often makes sense. Combining jobs makes good use of the visit, so mention them when you ask for a quote.
What information do you need?
Let us know what needs doing and where. We’ll ask anything else we need to know.
Is it OK to seal over old sealant?
No, it won’t last. It can look neat for a few weeks, but the new bead soon lifts. The old sealant has to come out completely.
Where are you based?
We work from Crawley. Our applicators cover Holwell, along with the rest of our area.
Common problems we fix in Holwell
Joints sealed without backing rod, or far too deep, rarely last. If the sealant sticks to the back as well as the sides, it cannot stretch and rips as the joint opens.
Any of these means the joints need attention:
- Joints with sealant missing in places
- Old sealant gone brittle and cracked
- Water getting into walls through failed joints
- Moss and dirt in joints with no sealant left
Letting a property close to Hitchin station? Then outside joints that have cracked can let damp into a rental, so check them between lets.
Comparing quotes
- Is the old sealant removed completely?
- What guarantee comes with the work
- Which sealant they’ll use, and why
- How the colour is chosen
What happens on the day
All our tools and materials come with us in the van, so you do not need to buy or prepare anything. After a quick look at the joints together, we protect the area and start. Most jobs take a few hours to a few days, depending on the length of joint and the access. For a village or hamlet like Holwell, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. 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.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Preparing for the visit
- Tell us about any water getting in
- Let us know about stairs, lifts or work at height
- Mention any sign-in or site rules at work premises
Getting a quote
Need a quote? Please ring 0345 464 0079 or send us an email with a few details. You will know what we plan to do, and what it will cost, before any work begins.
Advice
Places near Holwell
Other services in Holwell
DIY sealant or a professional job?
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
If you are set on DIY, put the effort into 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.
Work for landlords, hotels and businesses
We work for letting agents and landlords as well as homeowners. Sealant work between tenants keeps a property looking cared for.
From a single let to a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a one-year guarantee.
What external mastic looks like in Holwell
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 site and facilities teams at buildings such as The Priory School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. Homes close to Church of St Peter (C of E) at Corner with Holwell Road include some older properties, and the joints between older walls, newer extensions and the roofline need a sealant that can move.
Holwell is about 3 miles north-west of Hitchin, in Hertfordshire. If you need external mastic in Holwell, it’s easy to get a quote: please call 0345 464 0079 or send us an email. We’re based in Crawley and cover Hertfordshire. Our area takes in 381 places across Hertfordshire, large and small. Our London page covers work nearby.
Jobs for external mastic in SG5 is quoted and booked the same way as anywhere else. External mastic is available to properties on Gurney's Lane, Pirton Road and Rand's Meadow and the roads around them. Neighbouring places we cover for external mastic include Pirton (2 miles south-west), Shillington (3 miles west), Apsley End (3 miles west), Hanscombe End (3 miles west) and Pegsdon (3 miles south-west). Within a short drive, we also cover Stevenage (7 miles south-east), Welwyn Garden City (14 miles south), Harpenden (12 miles south), Hitchin (3 miles south-east), Letchworth (3 miles east) and Letchworth Garden City (3 miles east).
Landmarks near Holwell
For rail, the closest station is Hitchin station, about 2.8 miles south-east. Nearby you’ll also find Wymondley Castle (4.3 miles south-east) and Fairfield Hospital (2.7 miles north-east). Green spaces nearby include Markham's Hill and Oughtonhead Nature Reserve.
What affects the cost of external mastic
For a quick quote, just ask. The main things that affect it are:
- Any mould that needs treating
- Which sealant suits the joint
- Any working-time requirements on site
- How easy the joints are to reach
What it costs depends on the amount of work, how hard the old material is to remove and how easy the joints are to reach. You’ll have a clear quote before any work starts.
Asking for a quote
What to tell us when you ask for a quote:
- The type of property
- Pictures of the joints, sent by email
- Whether it has been sealed before
- How many joints, rooms or windows are involved
For a quote, ring 0345 464 0079 or email us with the location and a short description of the problem. We will give you a clear price before any work starts.