Portsmouth · England
Cosham Gutter Sealing
Gutter sealing across Cosham and nearby, with old sealant always removed completely and a 12-month guarantee.
- Wet patches on the wall under a gutter joint
- Damp patches inside below a leaking gutter
- Cracked sealant along roofline trims
Common problems we fix in Cosham
Stop ends take pressure from water running along the gutter. Once the seal behind them fails, they drip and runs down the wall.
These are the problems we’re asked about most:
- Damp on an inside wall under a dripping gutter
- Cracked sealant along roofline trims
- Gaps along fascia and soffit joints
- Quick sealant fixes on gutters that didn’t last
Schools such as Court Lane Junior Academy are buildings too, and larger buildings have long runs of movement joint that eventually need resealing.
Questions to ask before booking
- What the quote includes, VAT included or not
- Which sealant they’ll use, and why
- Whether they seal over old material or remove it
- What guarantee comes with the work
How we handle gutter sealing in Cosham
Gutter and fascia replacement isn’t our trade, and nor is roofing. What sealant does is close joints; it will not fix a broken bracket, a cracked section or a blocked downpipe. If you’re dealing with cracked sealant along roofline trims and drips from gutter joints and end caps, we can help, whatever the surface.
Houses in smaller places like Cosham can stand more in the open than those in a built-up town, and walls and rooflines facing the weather take the worst of it. Joints on those sides are usually the first to go.
We stand behind the work with a one-year guarantee, so you are covered after we have gone.
- Place
- Cosham (PO6, PO3, PO2)
- Wider area
- Portsmouth
- Cover
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Towns and villages near Cosham
What else we do in Cosham
Cosham questions
Do you cover smaller places like Cosham?
Yes. Cosham is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Does the coastal weather in Cosham affect outside sealant?
Near the sea, outside joints face more wind, rain and salt than they would inland, so the choice of sealant and the preparation matter even more. Walls facing the sea are normally the first to need attention.
Are you fully insured?
Yes. We are fully insured, and we can confirm the details when we quote.
Is it worth trying it myself?
You can, for simple jobs. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
Can you quote for more than one area?
Yes, and it often makes sense. Combining jobs makes good use of the visit, so mention them when you ask for a quote.
Will sealing fix a sagging gutter?
Sealant will not hold a sagging gutter. A gutter installer needs to refix it, and we’ll tell you if that is what we find.
Do you hold any approvals?
Yes. Mr Mastic is an ARBOMaster approved applicator.
Can landlords and businesses book you?
Yes. As well as homeowners, we work for landlords, agents, businesses and hotels.
Gutter sealing in Cosham: local notes
Cosham is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on gutter, fascia and roofline joints, which can dry out and crack sooner where a building faces the weather. The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For landlords with property near Cosham station, a dripping gutter joint or loose fascia trim is easy to miss until damp shows inside. For an older house near a landmark such as Church of St Philip, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Cosham is about 2 miles south-west of Purbrook, in Portsmouth. If you need gutter sealing in Cosham, please call 0345 464 0079 or send us an email for a quick quote. We’re based in Crawley and cover Portsmouth. Our Portsmouth coverage runs to 19 places, Cosham among them.
Our applicators cover all of the PO6, PO3 and PO2 postcode area for gutter sealing and the streets around it. You’ll find streets such as Dean Road, Park Lane and Elgin Road, and we cover them all. Being close to the A397, Cosham is simple for us to get to for gutter sealing. Close by, we work in Wymering (1 mile north-west), Hilsea (1 mile south), Drayton (1 mile east), Widley (1 mile north-east) and Paulsgrove (1 mile west). Within a short drive, we also cover Southsea (4 miles south), Milton (3 miles south), Landport (3 miles south), Portsea (3 miles south-west), Portsmouth Point (4 miles south-west) and Fratton (3 miles south).
Around Cosham
Locally, jobs take us to homes and businesses close to The First Post pub, Alexandra Park and Springfield School and the streets around them. Cosham has its own railway station: Cosham station. Nearby you will also find Tricorn Centre (2.9 miles south) and World War I Remembrance Centre (1 mile south-east). Open spaces near Cosham include Southmoor Nature Reserve and Portsdown Hill.
DIY sealant or a professional job?
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Leave it or put it right?
If the problem is a blocked downpipe, sealing will not help. We check the cause first and point you to the right trade if needed. Homes in smaller places like Cosham 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.
Doing several joints on one visit is generally more efficient than separate visits, so it’s worth mentioning everything you’d like done. You’ll get one clear quote for the whole job.
Why book with us
- More than 20 years in sealant work
- Rated 4.9 stars on Google
- Anti-fungal silicone where joints get wet
- We’re fully insured
Read what affects the cost and customer reviews.
Surface by surface
uPVC fascias
Our work is the joints, not new fascias. If boards are damaged, we’ll tell you.
Gutter joints
Gutter joints move and sit in water. A dedicated gutter sealant suits them.
For landlords and businesses
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. Several properties can be quoted together.
We also work for property managers and facilities teams in Cosham and across Portsmouth. We can quote a run of properties together, and we’re fully insured for the work.
How the visit works
On the day, we start by going over the job with you, so there are no surprises. We protect the surfaces around the joints before work begins. The work generally takes an hour or two for a few joints, longer for a full run. In a smaller place like Cosham, parking is seldom the issue; lanes, gates and long drives are worth mentioning. If the job is outside, tell us about side access and how high the joints are.
- We look at the gutters, fascias and trims and agree the joints to seal.
- We clean out each joint.
- We make sure everything is dry.
- The sealant is applied and finished.
- The joints are checked once sealed.
Getting ready for the visit
- Clear the area around the work
- On commercial sites, let us know about site rules
- Mention any tricky access
Get a quote
If you are in Cosham and need gutter sealing, ring 0345 464 0079 or email us. Tell us what the problem is and where, and you’ll get a clear quote before any work starts.
Read more
When it is not the sealant
We’d rather tell you now than do work that will not last, so here’s what sealant can’t put right:
- Leaks from the roof rather than a joint
- Sagging gutters or broken brackets
- Rotten or damaged fascia boards
If you’re not sure, just call 0345 464 0079 or email us and we’ll give you a straight answer before you book.
Where we work in Cosham
- Gutter end caps
- Soffit joints
- uPVC fascias
- Garage door frames
- Gutter joints
- Roofline trims