Greater London · England
Remedial sealant & repairs in Hampstead, Greater London
Removing failed, mouldy or leaking sealant and putting it right for Hampstead, backed by a one-year guarantee. Call for a quick quote.
- Decorators’ caulk around a bath or shower
- Repeat leaks from the same joint
- Over-sealed joints coming away
Remedial sealant for homes and businesses in Hampstead
Decorators’ caulk in a shower, bathroom silicone on a window, a rigid filler in a movement joint fails however neatly it’s applied. We take it out and use a sealant made for that joint. We are often asked to deal with a shower that leaks however often it’s resealed and smears and lumps from a botched reseal, on mouldy bath & shower sealant, failed movement joints and expansion joints.
London homes include a lot of flats, conversions and mansion blocks, and many bathrooms sit right above someone else’s ceiling. In Hampstead, that is a good reason to put tired sealant and grout right early.
A 12-month guarantee comes as standard, so you are covered after we’ve gone.
- Location
- Hampstead (NW3, NW6, NW11, N2)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Signs you need remedial sealant in Hampstead
Using the wrong product is a common cause: acrylic caulk in a wet area, a general-purpose sealant on a moving joint, or an acetoxy silicone on natural stone or some metals. Each fails in its own way.
The problems people usually mention when they call are:
- Leaks that keep coming back after resealing
- Smears and lumps from a botched reseal
- Products that weren’t meant for the joint
- Gaps opening along the back of the worktop
If you look after a building such as Fitzjohn's Primary School, we reseal washrooms and kitchens in schools and businesses as well as homes.
Before you book anyone
- What insurance they hold
- How the colour is chosen
- What happens if the job turns out different
- How much experience the applicator has
How it works
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, depending on how many layers have to come out. In Hampstead, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- Surrounding tiles, trays and frames are protected first.
- The botched or failed sealant is cut away completely.
- The joint is degreased and checked for movement and leaks.
- New sealant goes in once the joint is dry, and is tooled smooth.
- You get the cure time and our view on why the joint failed.
How to prepare
- On commercial sites, let us know about site rules
- Clear items away from the joints we’re working on
- Mention any leaks or damp you’ve noticed
Get a quote
Getting a quote is simple: let us know the job and the location. A few photos by email make the job easier to understand, and we’ll take it from there.
Read more
Remedial sealant in Hampstead: local notes
There are hotels and other places to stay in and around Hampstead. As well as homes, we work in hotel bathrooms, where resealing and regrouting can be done room by room. London’s water is hard, which leaves limescale on sealant, grout and taps, and it has to be cleaned off before new sealant goes in.
Hampstead is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. For an older house near a landmark such as St John-at-Hampstead church, timber floors under older bathrooms flex, so joints need a sealant that moves with them.
Hampstead is about 3 miles north-west of City of Westminster, in Greater London. If you need remedial sealant in Hampstead, please ring 0345 464 0079 or email us for a quick quote. We are based in Crawley and cover Greater London. Our Greater London coverage runs to 764 places, and Hampstead is one of them.
Every address in NW3, NW6, NW11 and N2 is within our area for remedial sealant. That includes homes and businesses on Hampstead High Street, New End Square and The Mount Square. Hampstead sits on or near the A1 and A502, so getting to you is simple. Nearby, we also carry out remedial sealant in Greenhill (1 mile north-east), West Hampstead (1 mile west), Fortune Green (1 mile west), Vale of Health (1 mile north) and South Hampstead (1 mile south). Larger places within reach include London (5 miles south-east), City of Westminster (3 miles south-east), Marylebone (3 miles south-east), Kensington (4 miles south), St Pancras (3 miles south-east) and Shoreditch (5 miles south-east). Hampstead is one of the larger places we cover in Greater London.
Local landmarks in Hampstead
In Hampstead, that means homes and buildings near South Hampstead High School, Kilburn Grange Park and St Anthony's Preparatory School and the streets around them. Nearby too are King William IV Public House (less than half a mile north-east) and Cecil Sharp House (1.7 miles south-east). Hampstead has its own railway station: Finchley Road & Frognal station. Nearby you’ll also find Isokon Gallery (0.8 miles east) and New End Hospital (under half a mile north). Green spaces nearby include Belsize Wood and The Long Water.
Common questions in Hampstead
Can parking be tricky for a visit in Hampstead?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot.
Do you work in hotels near Hampstead?
Yes, we work for hotels as well as homes and businesses. A room-by-room programme keeps most rooms in use while the work goes on.
How much does remedial sealant cost in Hampstead?
Every job is different, so each one gets its own quote. For a quick quote, ring 0345 464 0079 or drop us an email and let us know what needs doing and where.
Do you come to Hampstead?
Yes. We are based in Crawley and work across South East England, London and Scotland, and that includes Hampstead.
Can failed expansion joints be resealed?
Yes. If a joint has been filled with mortar or rigid filler, we rake it out where possible, then the joint is sealed properly.
Can you take off two layers of silicone?
Yes. We cut out all the layers and clean off the film, before resealing with a single bead.
Are you fully insured?
Yes. Mr Mastic is fully insured, with over 20 years’ experience in sealant work.
Can you remove old sealant without damaging the bath?
Yes. Careful removal is most of a remedial job, especially on acrylic, enamel and uPVC.
Why it’s worth doing now in Hampstead
It’s easy to scratch acrylic, enamel or an uPVC frame cutting out old sealant, and the residue left behind stops the next bead bonding. Careful removal is most of a remedial job. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and by the time it shows on a wall or ceiling in Hampstead, the repair is bigger than the sealant job would have been.
Leaving a failed joint normally makes the job bigger, not smaller, as water and mould keep getting in. If you’re not sure whether it needs doing, call 0345 464 0079 or drop us an email for an honest opinion and a quote.
Why choose Mr Mastic in Hampstead
- More than 20 years in sealant work
- An ARBOMaster approved applicator
- Full insurance on every job
- Neat joints and a tidy finish
See our cost guide or customer reviews.
Can I do it myself?
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
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 fails, we can still redo it.
Keeping the joints in good condition
How long the joints last depends on use and care. Here’s what we suggest:
- Keep bleach and abrasives off the bead
- Look for stains below bathrooms now and then
- Ask why a joint failed before redoing it
- Act on a lifting corner right away
Keep an eye on the joint at first, especially if movement was the problem. Should anything change, ring 0345 464 0079 or email us.
A failing joint rarely gets better on its own. Each use pushes more water behind the bead, into whatever is behind or below. Sorting it early limits the damage.
How we quote for remedial sealant
Some jobs are bigger than they look, and some smaller. What affects the quote:
- The number of rooms or windows
- Mould in or behind the old joints
- How much there is to do
- Whether old sealant or filler has to be cut out
No two jobs are quite the same, so each one gets its own quote. Size, access and the product the joint needs all make a difference.
What we need to know
Photos help, but a description is a good start. Try to tell us:
- What the problem is, such as mould, gaps, leaks or cracking
- Roughly how big the job is
- If someone has resealed it before
- Access, such as stairs, a lift or height
Need a quote? Please phone 0345 464 0079 or drop us an email with a few details. We’ll explain what we’d do and give you a clear quote before we start.
Places near Hampstead
What else we do in Hampstead
Landlords, agents and businesses in Hampstead
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.
We work for landlords and letting agents as well as homeowners. Resealing between tenancies is a simple way to keep a property in good order.