Greater London · England
Gutter, fascia & soffit sealing in Harefield, Greater London
Sealing leaking gutter joints, end caps, fascias, soffits and roofline trims for homes and businesses in Harefield and across Greater London. Fully insured, ARBOMaster approved and guaranteed for a year.
- Quick sealant fixes on gutters that didn’t last
- Drips from gutter joints and end caps
- Rain getting in around a garage door
Gutter sealing in Harefield, done properly
Gutter and fascia replacement isn’t our trade, and nor is roofing. Sealant fixes joints; it will not fix a broken bracket, a cracked section or a blocked downpipe. Common call-outs are for wet patches on the wall under a gutter joint and earlier gutter repairs that have peeled off, on uPVC fascias, garage door frames and soffit joints. Mr Mastic is a specialist sealant company, not a general handyman, so gutter sealing in Harefield is done by someone who does this every day.
London’s terraces and conversions often share walls, gutters and downpipes with their neighbours, so a leaking gutter joint or failed wall joint can affect more than one home. For a flat in Harefield, check the lease for who looks after the outside.
A one-year guarantee comes as standard, so you are not left on your own once the job is done.
- Where
- Harefield (UB9)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Price
- A clear quote up front
- Telephone
- 07833 053749
- Last updated
- 26 October 2026
Harefield: your questions answered
Can you do gutter sealing in Harefield?
Yes, Harefield is within the area we cover. Our work covers London and the South East. Just call 07833 053749 or email us with a few details of the job, and we’ll give you a clear price.
I let a flat near Denham station. Can you help?
Yes, landlords and agents are among the people we work for. You can ring 07833 053749 or email us with the details for a clear quote.
Does someone need to be in?
It depends on the job. Inside work needs someone to give us access, while outside work can sometimes be arranged differently.
How long should I leave it?
Cure times vary by product and the conditions. Before we leave, we will tell you the cure time.
Is it OK to seal over old sealant?
No. Fresh sealant does not stick to old sealant, and it traps any mould or water underneath. It all has to come out first.
Will it make a mess?
No. The area is protected while we work and cleaned up afterwards.
Are you ARBOMaster approved?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
Will sealant fix a dripping gutter joint?
Yes, as long as the gutter itself is in good order. We clean and dry the joint before sealing so the sealant bonds.
Walls and rooflines in Harefield
With historic houses such as Ickenham Hall (about 3.4 miles south-east) nearby, there’s older building stock in the area around Harefield as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For site and facilities teams at buildings such as Harefield Infant School, larger buildings have long runs of movement joint that eventually need resealing. As a London address, Harefield can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Harefield is about 3 miles south of Rickmansworth, in Greater London. We provide gutter sealing to householders, landlords and businesses in Harefield. Our Greater London coverage runs to 786 places, Harefield among them.
We work across UB9 for gutter sealing and the streets around it. Whether your property is on High Street, Vernon Drive and New Park Road or anywhere close by, our applicators can take on the job. Neighbouring places we cover for gutter sealing include Hill End (1 mile north), Woodcock Hill (1 mile north-east), Batchworth Heath (2 miles north-east), Batchworth (2 miles north-east) and Mill End (2 miles north). Larger places within reach include City of Westminster (15 miles south-east), Kensington (14 miles south-east), Hampstead (13 miles east), Ruislip (4 miles south-east), Ealing (10 miles south-east) and Hayes (7 miles south-east).
Near you in Harefield
We work in homes and buildings around The King's Arms Public House, The Green and The Harefield Academy. Harefield’s nearest station is Denham station, roughly 2 miles south of the centre. A little further out are Chiltern Open Air Museum (3.4 miles north-west) and Harefield Hospital (less than half a mile north-west). The countryside around Harefield includes Dews Farm Sand Pits and Horse Shoe Bay.
How the job changes by surface
uPVC fascias
Fascia board joints can open up. They’re sealed tidily in a suitable colour.
Gutter joints
Most gutter leaks start at a joint between sections. We clean, dry and reseal them.
How it works
We bring everything the job needs with us, so there’s nothing for you to buy. Once we have agreed what’s being done, the area is protected and the work begins. It normally takes an hour or two for a few joints, longer for a full run. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Harefield. It helps if you can point us to a visitor permit or a bay close to the door.
- First we agree which joints need sealing.
- We clean out each joint.
- The joints are dried.
- The sealant is applied and finished.
- We check our work before we leave.
How to prepare
- Keep pets and children clear of the area while we work
- Tell us if parking is tricky
- Tell us about any water getting in
Ask for a quote
Want a quote for gutter sealing? Please phone 07833 053749 or drop us an email with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.
Read more
For landlords and businesses
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. We can quote for more than one property at once.
For anyone letting property in or around Harefield, several properties can be quoted together. Send us the addresses and the work at each.
Towns and villages near Harefield
Other services in Harefield
How we quote for gutter sealing
We do not publish a price list, because no two jobs are the same. The quote depends on:
- Mould in or behind the old joints
- Working hours on commercial sites
- The number of rooms or windows
- Access and height
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. We take all of that into account in your quote.
What to tell us for a quote
When you call or email, these details help:
- A few photos by email, if you can
- If it’s domestic, commercial or a hotel
- The address or postcode of the job
- Any access issues, like height or stairs
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and add photos by email if you can.
When something else is needed
New sealant can’t fix everything, and we’d rather say so up front. Sealant will not put right:
- Rotten or damaged fascia boards
- Leaks from the roof rather than a joint
- Downpipes that are blocked or broken
If in doubt, phone 07833 053749 or email us and we’ll say what we think before you book.
Where we work in Harefield
- Soffit joints
- uPVC fascias
- Gutter joints
- Garage door frames
- Roofline trims
- Gutter end caps
What we are called out for in Harefield
When a gutter sags, its joints open. Resealing a sagging joint will not last, so the gutter needs refixing first.
Look out for these signs:
- Trim joints where the sealant has failed
- Dripping gutter ends
- Fascia boards with gaps between them
- Earlier gutter repairs that have peeled off
For landlords with property near Denham station, a gutter joint that drips onto the wall can turn into a damp complaint, so it’s worth checking.
Questions to ask before booking
- Is the old sealant removed completely?
- Whether the sealant suits the joint
- What guarantee comes with the work
- Whether you can choose the colour
Can I do it myself?
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.
If you’ve already had a go yourself, that is fine. We cut it out and start again, so just mention it when you contact us.