West Sussex · England
Gutter, fascia & soffit sealing in Horsham, West Sussex
Sealing leaking gutter joints, end caps, fascias, soffits and roofline trims in Horsham, with a 12-month guarantee on every job. Ask us for a quote.
- Water running down the wall below the gutter
- End caps that drip every time it rains
- Open joints in fascias and soffits
Gutter sealing in Horsham, done properly
We work across Horsham on leaking gutter joints and roofline trims. Single-storey and low gutters are simple to reach and if it’s higher up, let us know and we will confirm what access is needed. Common call-outs are for rain getting in around a garage door and dripping gutter ends, across gutter end caps, roofline trims and uPVC fascias.
In a large town like Horsham, plenty of buildings are rented or managed, and outside joints are easy to forget. A failed joint above a door or a dripping gutter end is normally the first sign.
We stand behind the work with a 12-month guarantee.
- Where
- Horsham (RH12, RH13, RH20, BN44)
- Region
- West Sussex
- Guarantee
- 12 months on all our work
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Horsham questions
Do you work for landlords with property near Horsham station?
Yes, we work for landlords and agents. You can call 0345 464 0079 or email us with the address and a few details, and we’ll give you a fixed price before any work starts.
Can you do gutter sealing in Horsham?
Yes. Our work covers London and the South East, and Horsham is part of that. Just call 0345 464 0079 or send us an email with a few details of the job, and we’ll give you a clear quote.
Is it OK to seal over old sealant?
No. Fresh sealant doesn’t stick to old sealant, and anything trapped underneath, including mould and water, stays there. It all has to come out first.
Do you clean gutters?
We clean the joints we’re sealing and clear debris we find nearby. Cleaning the whole run is a different job.
Are you an approved applicator?
Yes. We’re approved under the ARBOMaster scheme, which is run for the Arbo sealant brand.
Can I choose the sealant colour?
Usually, yes. White, clear and grey are common, and other colours are available, and we agree the colour with you before we start.
Will the old sealant be removed?
Yes. All of the old material is cut out and the joint cleaned before applying anything new.
What about gutters on a second or third storey?
Low gutters are simple to reach. If it’s higher up, let us know and we’ll confirm the access.
How it works
There is not much for you to do on the day. Point us to the joints and we’ll get on with it. The work itself takes a few hours, depending on the number of joints and the access from start to finish. Where a business in Horsham needs to stay open, out-of-hours working can be arranged, and homes are booked within our usual hours, Monday to Saturday.
- First we trace the drip and check the gutter is not damaged.
- 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.
- The gutter is checked and debris around the joints cleared.
Getting ready for the visit
- Clear items away from the joints we are working on
- Tell us about access, such as stairs, a lift or high-level joints
- On commercial sites, let us know about site rules
Get a quote
We quote each job on its own, so the first step is telling us about yours. Just call 0345 464 0079 or email us with the details.
Read more
Why it’s worth doing now in Horsham
New gutters cost far more than a few resealed joints. Where the gutter is in good order and only a joint leaks, resealing is the sensible fix. If it has failed, we will tell you. For landlords in Horsham, failed sealant soon turns into tenant complaints about mould, damp or draughts. It’s simpler to sort between tenants than in the middle of a let.
Commercial jobs are quoted on the same basis as homes: how much there is to do, how we reach it and what it needs. Call for a quick quote and we will explain what it covers.
Why choose Mr Mastic in Horsham
- Quality sealants from Arbo and Everbuild
- Colour agreed with you before any work starts
- 180+ five-star Google reviews
- Tidy, careful work
Should I try it myself first?
If you’ve already had a go yourself, that’s fine. We cut it out and start again.
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
Walls and rooflines in Horsham
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.
Rented homes near Horsham 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 Hope Chapel, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Horsham is about 31 miles south of London, in West Sussex. Whether you’re in the middle of Horsham or further out, we cover gutter sealing for every kind of property. Across West Sussex, we cover 371 places, Horsham among them. Our Crawley page covers work nearby (7 miles or so).
Jobs for gutter sealing in RH12, RH13, RH20 and BN44 works the same way as everywhere else we cover. Whether your property is on Station Road, London Road and Market Square or anywhere close by, we can help. Main roads around Horsham include the A24 and A29. We also cover the places around Horsham: Tower Hill (1 mile south-west), Broadbridge Heath (2 miles west), Holbrook (2 miles north), Warnham (2 miles north-west) and Southwater (3 miles south). Within a short drive, we also cover Crawley (7 miles north-east), Haywards Heath (11 miles south-east), Burgess Hill (11 miles south-east), East Grinstead (14 miles east), Broadfield (5 miles east) and Storrington (11 miles south-west). Horsham is among the bigger towns we cover in West Sussex.
Around Horsham
Typical jobs here are in homes near Millais School, Warnham Park and Kingslea Primary School, among other places. Horsham has its own railway station: Horsham station. Other landmarks nearby include Christs Hospital School Museum (2.4 miles south-west) and Horsham Hospital (under half a mile north-west). Green spaces nearby include Warnham LNR.
How to look after the new joints
Simple care keeps the joints in good condition. We recommend:
- Keep an eye out for wet patches below a joint
- Glance at the soffit joints now and then
- Get a dropping gutter looked at quickly
- Clear leaves and moss from the gutters
Keep downpipes clear, so water can get away. Blockages push water back along the gutter.
Split sealant on fascias and trims lets water in behind. Resealing early protects the boards.
Places near Horsham
Other services in Horsham
Honest limits
We won’t take on work that won’t last, so these are the limits:
- Sagging gutters or broken brackets
- Water backing up from a blocked pipe
- Roof leaks, slipped tiles or failed flashing (a roofer’s job)
If in doubt, call 0345 464 0079 or email us and we’ll say what we think.
Joints and surfaces we work on
- Garage door frames
- Soffit joints
- Roofline trims
- Gutter joints
- Gutter end caps
- uPVC fascias
How the job changes by surface
Gutter end caps
End caps are resealed where they meet the gutter once clean and dry.
Soffit joints
We choose a sealant colour that suits the soffit.
What affects the quote in Horsham
We do not publish a price list. What we look at:
- Working hours on commercial sites
- Whether the work is at height
- The product the joint needs
- The number of rooms or windows
A few things move the cost up or down: 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.
Helping us quote
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- Roughly how big the job is
- Whether it has been sealed before
- Any access issues, like height or stairs
- Where the job is, and your postcode
Need a quote? Please ring 0345 464 0079 or send us an email and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.