Hertfordshire · England
St Nicholas Gutter Sealing
Our applicators work in St Nicholas on sealing leaking gutter joints, end caps, fascias, soffits and roofline trims. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Cracked sealant along roofline trims
- Dripping gutter ends
- Damp patches inside below a leaking gutter
Gutter sealing in St Nicholas
For gutter sealant to hold, the joint has to be clean and dry. That’s why we take out the old sealant and dirt first, then dry the joint before sealing. We work on uPVC fascias, gutter end caps and garage door frames, and common reasons people get in touch are gaps along fascia and soffit joints and rain getting in around a garage door.
Around St Nicholas, garages, outbuildings and extensions all add to the joints on the outside of a home. Gutter ends, garage door frames and the joints where an extension meets the house are typical spots for leaks.
The work is guaranteed for twelve months. If something isn’t right with it in that time, tell us and we’ll put it right.
- Place
- St Nicholas (SG1, SG2)
- Wider area
- Hertfordshire
- Guarantee
- A year, on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Questions from St Nicholas
Is it worth replacing old sealant in an older home in St Nicholas?
If it hasn’t been replaced for some years, it’s generally worth it. Sealant does not last for ever, and its life depends on use, cleaning and weather.
Is St Nicholas within the area you cover?
Yes, we do. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Can I choose the sealant colour?
In most cases you can choose. We’ll explain which colours are available and agree one before we start.
Do you work for landlords and businesses?
Yes, we do. We work in homes, commercial premises and hotels, and we are fully insured.
Do you seal gaps in fascias and soffits?
Yes. Our work is the joints and we will let you know if a board has failed.
Do you hold any approvals?
Yes. Mr Mastic is an ARBOMaster approved applicator and we are fully insured too.
Is it worth trying it myself?
Some simple jobs can be done by a careful DIYer. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
What does gutter sealing cost?
Every job is different, so each one gets its own quote. To get one, ring 0345 464 0079 or send us an email with a short description of the job.
What the job involves on each surface
Gutter joints
A gutter joint has to cope with movement and standing water. A dedicated gutter sealant suits them.
Soffit joints
We choose a sealant colour that suits the soffit, where one is available.
How the visit works
We bring everything the job needs with us, so you do not need to buy or prepare anything. After a quick look at the joints together, we protect the area and start. It normally takes a few hours, depending on the number of joints and the access. For a job in St Nicholas, we agree the time, the access and parking before the day. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- We find where the water is coming from and check the gutter is sound.
- We remove the old sealant and clean the joint.
- We dry the joint so the new sealant can bond.
- We seal the joint with a sealant made for gutters.
- We check the run and clear debris near the joints.
How to prepare
- Let us know about parking restrictions
- Mention any sign-in or site rules at work premises
- Let us know about stairs, lifts or work at height
Getting a quote
It all starts with a short chat. Describe the problem, the location and the size of the job, and we will explain how we’d tackle it. When it suits you, call 0345 464 0079 or email us.
Related advice
Why it’s worth doing now in St Nicholas
A bead squeezed onto a wet joint might hold for a while, but it soon lets go. Cleaning out and drying the joint first is what makes it last. Homes in smaller places like St Nicholas can face more weather, and failed outside joints let damp into walls. Indoors, a failed seal lets water into floors and panels as it would anywhere.
No two jobs are quite the same, so each one gets its own quote. Size, access and the product the joint needs all play a part.
Why us?
- Neat joints and a tidy finish
- We agree the colour with you first
- Homes, businesses and hotels
- White, clear, grey or coloured to suit, where the product allows
Read our cost guide and our reviews.
Walls and rooflines in St Nicholas
Historic houses like Aston Bury (about 3.3 miles south) are a reminder that the area around St Nicholas has older buildings as well as new. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Homes close to All Saints Church include some older properties, and an extension built onto an older house moves differently, and the joint between them takes the strain. Rented homes near Stevenage station change hands often, and leaking gutter joints on a rental are best caught before they stain the walls.
St Nicholas is about 1 mile north of Stevenage, in Hertfordshire. We provide gutter sealing to homeowners, landlords and businesses in St Nicholas and nearby, as part of our work across Hertfordshire. Our Hertfordshire coverage runs to 381 places, St Nicholas among them. You can also see our page for London, about 30 miles away.
Every address in SG1 and SG2 is covered for gutter sealing, from the main roads to the quietest streets. Streets in the area include York Road, Ripon Road and Drury Lane. We also cover Rooks Nest (1 mile west), Pin Green (1 mile south-west), Chells (1 mile south-east), Stevenage (1 mile south) and Bedwell (1 mile south-west). Within a short drive, we also cover St Albans (14 miles south-west), Bishop's Stortford (15 miles east), Welwyn Garden City (9 miles south), Harpenden (10 miles south-west), Hitchin (4 miles north-west) and Hoddesdon (14 miles south-east).
Local landmarks in St Nicholas
Typical jobs here are in homes near Church of Saint Nicholas and The Nobel School, among other places. The nearest railway station is Stevenage station, about 2 miles south-west of the centre. Other landmarks nearby include Wymondley Castle (2.7 miles north-west) and Stevenage Museum (1.8 miles south-west). Green spaces nearby include Pryor's Wood.
When it isn’t the sealant
We’d rather tell you now than do work that will not last, so here’s what sealant can’t put right:
- A gutter length that has split
- Problems with the roof covering
- Brackets that have snapped or loosened
Not sure which it is? You can phone 0345 464 0079 or email us and we will tell you honestly.
Surfaces we seal
- Roofline trims
- Gutter joints
- Gutter end caps
- Soffit joints
- Garage door frames
- uPVC fascias
DIY sealant or a professional job?
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
Quotes for gutter sealing in St Nicholas
For a quick quote, just ask. What matters most is:
- The size of the job
- The old material and how stubborn it is
- How many areas need sealing
- Access and height
Homes and businesses are quoted the same way: the amount of work, how we reach it and what it needs. Ask us for a quote and we’ll go through it with you.
Helping us quote
Photos help, but a description is a good start. Please mention:
- The address or postcode of the job
- Whether it has been sealed before
- Roughly how big the job is
- Photos by email, if that’s easy
Need a quote? Please ring 0345 464 0079 or drop us an email and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.
What else we do in St Nicholas
When to call us in St Nicholas
Overflowing gutters can look like leaking joints. A blocked downpipe makes water back up so we check the cause first.
Signs it’s time to call us include:
- Wet patches on the wall under a gutter joint
- Trim joints where the sealant has failed
- Failed sealant on a garage door frame
- Stop ends leaking at the end of a run
Schools such as The Leys Primary and Nursery School are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Comparing quotes
- How the joint is cleaned and prepared
- Whether they’re fully insured
- What product goes in the joint
- What the cure time is