Hertfordshire · England
Remedial Sealant in Harmer Green
Removing failed, mouldy or leaking sealant and putting it right for homeowners, landlords and businesses in Harmer Green. Fully insured, ARBOMaster approved and guaranteed for a year.
- Smears and lumps from a botched reseal
- Beads that never stuck properly
- Worktop sealant that has shrunk and split
The process
Most of a good job is in the preparation, so that is where we spend the time. Joints are cleaned back and dried before anything new goes in. All told, the work takes a few hours for a typical bath or shower, longer where several layers have been applied. Somewhere as small as Harmer Green, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First we work out whether the problem is the sealant, movement or a leak.
- Old beads and residue are removed down to clean surfaces.
- We treat any mould and dry the joint thoroughly.
- We reseal with a product suited to the joint, backed where needed.
- We finish neatly and point out anything that needs another trade.
Getting ready for the visit
- Tell us about any water getting in
- Where the joints are inside, avoid wetting them before we arrive
- Plan for the work area to be out of bounds to pets and children
How to get a quote
It all starts with a short chat. Describe the problem, the location and the size of the job, and we’ll explain how we’d tackle it. When it suits you, phone 0345 464 0079 or email us.
Related advice
About our remedial sealant in Harmer Green
Water on the floor does not always mean failed silicone. Cracked trays, leaking wastes and faulty valves often look like a sealant problem. When the fault is elsewhere, we say so instead of resealing for the sake of it. Typical jobs include products that weren’t meant for the joint and worktop sealant that has shrunk and split, across shrunken worktop sealant, expansion joints and mouldy bath & shower sealant.
Somewhere as small as Harmer Green, homes tend to be cottages, farmhouses or converted buildings, with some newer houses too. Older walls and timber floors can move a little, and cracked grout and split sealant are often the first signs.
Each job carries a 12-month guarantee, large or small.
- Where
- Harmer Green (AL6)
- Wider area
- Hertfordshire
- Cover
- 12 months on all our work
- Quotes
- A clear price before we start
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
When something else is needed
Before you book, it’s worth knowing the limits too:
- Leaks from a shower valve, waste or pipework (a plumber’s job)
- Older mastics that may need an asbestos check before removal
- Failed tanking or loose tiles behind the sealant
If you’re not sure, just call 0345 464 0079 or send us an email and we will give you a straight answer.
Where we work in Harmer Green
- Failed movement joints
- Leaking tray & enclosure joints
- Mouldy bath & shower sealant
- Expansion joints
- Shrunken worktop sealant
- Botched or over-sealed joints
Places near Harmer Green
What else we do in Harmer Green
Signs you need remedial sealant in Harmer Green
Some joints fail because water is reaching them from behind. A leaking valve, a failed waste or cracked grout feeds water behind the bead, and the sealant lifts or goes mouldy from underneath.
These are the problems we’re asked about most:
- Beads that never stuck properly
- A shower that leaks however often it’s resealed
- Kitchen joints letting water behind the worktop
- Smears and lumps from a botched reseal
Schools such as Oaklands Primary School are buildings too, and we reseal washrooms and kitchens in schools and businesses as well as homes.
What to look for in a quote
- Is VAT in the price?
- How the joint is cleaned and prepared
- Which sealant they’ll use, and why
- What insurance they hold
DIY versus a professional finish
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.
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.
What affects the cost of remedial sealant
The quote reflects the job in front of us. We take into account:
- Any working-time requirements on site
- How much old sealant there is and how hard it is to remove
- Any mould that needs treating
- The number and length of the joints
There are no prices on our website, because the cost depends so much on the job itself. For a quick quote, please call 0345 464 0079 or send us an email.
Asking for a quote
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- Any previous sealing or DIY work
- The rough size of the job
- The address or postcode of the job
- Photos by email, if that’s easy
For a quote, phone 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. We will give you a clear quote before any work starts.
Bathrooms and kitchens in Harmer Green
Most of the South East has hard water, so limescale builds up on sealant, grout and fittings.
If you let a flat or house near Welwyn North station, botched sealant from a previous quick fix is easier to strip out between tenants. If you live in an older home near Digswell Village Church, bathrooms in older houses have often been refitted more than once, with sealant laid over sealant.
Harmer Green is about 2 miles north of Welwyn Garden City, in Hertfordshire. From the centre of Harmer Green to the outskirts, we cover remedial sealant for every kind of property, from flats and houses to offices and hotels. Our area takes in 381 places across Hertfordshire, large and small. You can also see our page for London, roughly 23 miles from Harmer Green.
Every address in AL6 is within our area for remedial sealant, from the main roads to the quietest streets. Neighbouring places we cover for remedial sealant include Burnham Green (1 mile east), Tewin Wood (1 mile east), Oaklands (1 mile north-west), Bull's Green (1 mile north-east) and Digswell (1 mile south-west). We also work in nearby towns such as Watford (15 miles south-west), Hemel Hempstead (13 miles south-west), Stevenage (5 miles north), St Albans (8 miles south-west), Bishop's Stortford (15 miles east) and Harpenden (7 miles west).
Landmarks near Harmer Green
Around Harmer Green, our work takes us to homes and buildings near Danesbury Park, Monk's Walk School and The White Horse Public House and the streets around them. The nearest railway station is Welwyn North station, roughly 0.8 miles south-west of the centre. Nearby you will also find Hertford Castle (4.9 miles south-east) and Queen Elizabeth II Hospital (3.4 miles south). Open spaces near Harmer Green include Tewin Orchard and Hopkyns Wood.
Common questions in Harmer Green
Do you work for landlords with property near Welwyn North station?
Yes, we work for landlords and agents. You can ring 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before we start.
Is Harmer Green within the area you cover?
Yes. Harmer Green is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
How long should I leave it?
That depends on the sealant used, so please follow the time we give you when we finish.
Does someone need to be in?
We need access to the joints, so we will agree that with you when we book. Indoors, that normally means someone at home.
Can I add another job to the visit?
Yes, and it often makes sense. Combining jobs makes good use of the visit.
What do you need from me for a quote?
The location, the problem and the rough size of the job. If you can, email a few photos.
Can you reseal a split movement joint?
Yes. The depth is set with backing so the sealant only bonds to the two sides.
Do you offer different sealant colours?
We help you choose a colour that suits, from white and clear to greys and other shades. The choice depends on the product the joint needs.
Landlords, agents and businesses in Harmer Green
Housing providers, facilities teams and property managers book us too in Harmer Green and across Hertfordshire. Several sites can be quoted together.
Hotels need rooms back in use, so we plan the work room by room. We have worked in hotels as well as homes and businesses.
Why it’s worth doing now in Harmer Green
Leaks that are left keep doing damage out of sight: wet floors, stained ceilings and swollen worktops. By comparison, sorting the joint is quick. In a small place like Harmer Green, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
What you pay reflects the work, not a rough estimate. That’s why we ask about the job first and agree the price before starting.
Why book with us
- Colour agreed with you before any work starts
- Old sealant always removed completely
- A sealant colour to suit the surroundings
- Neat joints and a tidy finish
Read what affects the cost and customer reviews.