Hertfordshire · England
Gutter Sealing in Old Knebworth
Gutter sealing for Old Knebworth and the surrounding area: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Open joints in fascias and soffits
- Streaks down the brickwork from a leaking joint
- Rain getting in around a garage door
Surface by surface
Gutter joints
Joints between gutter lengths are the most common leak point. They’re cleaned out, dried and resealed.
Soffit joints
Soffit board joints can separate over time. We seal them to close the gaps.
About our gutter sealing in Old Knebworth
Water dripping from a gutter joint can stain walls and soak the ground below. Often a reseal is enough if the gutter is not damaged. We work on uPVC fascias, soffit joints and roofline trims, and common reasons people get in touch are damp on an inside wall under a dripping gutter and drips from gutter joints and end caps.
Older homes in small places like Old Knebworth may be stone, brick or timber-framed, often with later extensions. The joints where those materials meet are the weak points.
Every job is covered by our one-year guarantee.
- Place
- Old Knebworth (SG3)
- Region
- Hertfordshire
- Cover
- A year, on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Also near Old Knebworth
Also in Old Knebworth
For landlords and businesses
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance that we can handle for you.
Housing providers, facilities teams and property managers book us too in Old Knebworth and across Hertfordshire. Several sites can go on one quote.
Why act early in Old Knebworth
A new garage door is not needed for a leaking frame. Sealing the frame generally stops it. In a small place like Old Knebworth, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
No two jobs are quite the same, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all play a part.
Why choose Mr Mastic in Old Knebworth
- 20+ years of sealant experience
- We leave the area clean and tidy
- Fully insured
- You choose the colour before work begins
See our cost guide or our reviews.
Should I try it myself first?
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
What gutter sealing looks like in Old Knebworth
With historic houses such as Knebworth House (about 0.2 miles north-west) nearby, there’s older building stock in the area around Old Knebworth as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
If you look after a building such as Barnwell School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. Rented homes near Knebworth station change hands often, and leaking gutter joints on a rental are best caught before they stain the walls. For an older house near a landmark such as Church of St Mary and St Thomas, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Old Knebworth is about 3 miles south-west of Stevenage, in Hertfordshire. Jobs in Old Knebworth get the same care as everywhere else we work: old sealant removed completely, careful preparation and a one-year guarantee. 381 places in Hertfordshire are on our list, large and small. There’s also a page for London, about 26 miles away.
Here we cover the SG3 postcode area for gutter sealing. If you need gutter sealing at a property on Old Knebworth Lane and Park Lane or a nearby road, we can help. If you’re just outside Old Knebworth, we cover Nup End Green (1 mile south-west), Driver's End (1 mile south-west), Rableyheath (1 mile south), Pottersheath (1 mile south) and Langley (2 miles north-west). Larger places within reach include Hemel Hempstead (13 miles south-west), Stevenage (3 miles north-east), St Albans (10 miles south-west), Welwyn Garden City (5 miles south), Harpenden (7 miles south-west) and Hitchin (6 miles north-west).
Landmarks near Old Knebworth
We work in homes and buildings around Knebworth Park and Robin Hood And Little John Public House and the streets around them. For rail, the closest station is Knebworth station, about 1 mile east of the centre. Other landmarks nearby include Lister Hospital (3.7 miles north) and Stevenage Museum (2.2 miles north). Open spaces near Old Knebworth include Mardley Heath.
Old Knebworth questions
Can you do gutter sealing in Old Knebworth?
Yes. Our work covers London and the South East, and Old Knebworth is part of that. You can ring 0345 464 0079 or drop us an email and tell us what needs doing, and we will send you a clear quote.
Is Old Knebworth within the area you cover?
Yes, we do. We work across London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
What about gutters on a second or third storey?
That depends on the building. Tell us the height and what’s around the gutter when you call 0345 464 0079 or drop us an email.
Do you install new fascias or gutters?
That’s not something we do. We seal joints and replacement is a job for an installer.
Do you seal gaps in fascias and soffits?
Yes. Open joints along uPVC fascias and soffits can be sealed in a colour to suit.
How long does gutter sealing take?
It depends on the size of the job, but as a guide it takes anything from an hour or two to a few hours. We’ll tell you when we quote.
I’m a tenant. Can you help?
Of course. Ask your landlord first, and we can send them the quote if that helps.
Will there be a smell?
Sometimes, a little. Any smell clears as the sealant cures.
What affects the cost of gutter sealing
We quote each job individually. This is what makes a difference:
- Any working-time requirements on site
- Whether old sealant or filler has to be cut out
- Access and height
- Which sealant suits the joint
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you are unsure, call 0345 464 0079 or drop us an email and we will give you an honest view and a quote.
Helping us quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- The rough size of the job
- Any previous sealing or DIY work
- The type of property
- Pictures of the joints, sent by email
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we’ll talk you through what we’d do. Whenever you are ready, call 0345 464 0079 or send us an email.
What happens on the day
When we get to you, we check the joints match what you told us. If anything is different, we explain it before carrying on. Most jobs then take anything from an hour or two to a few hours. Somewhere as small as Old Knebworth, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- First we trace the drip and check the gutter is not damaged.
- The old sealant and dirt are cleaned out of the joint.
- We dry the joint so the new sealant can bond.
- A gutter sealant is applied to the joint.
- The gutter is checked and debris around the joints cleared.
How to prepare
- Tell us about access, such as stairs, a lift or high-level joints
- Clear the area around the work
- Let us know about earlier repairs to the joints
Getting a quote
We don’t publish a price list, as no two jobs are quite the same. Instead, we give you a clear price for your job. To get started, phone 0345 464 0079 or email us.
Related advice
Looking after it afterwards
No joint lasts for ever, but care makes a real difference. Our tips:
- Get leaks sealed before the wet months
- Check fascia and soffit joints for gaps
- Make sure downpipes are not blocked
- Keep ladders off the guttering
A sagging gutter needs its brackets checked. Movement will pull the joints open again.
Split sealant on fascias and trims lets water in behind. Sealing it early keeps the boards behind dry.