uPVC vs cast iron gutters — which to choose for a Bath house

When most people replace their gutters, they go with uPVC because it’s what the builder offers. For a Bath property, the choice matters more than it does for a modern estate house. Here’s how to think about it.

uPVC gutters

What they are: moulded plastic gutters, usually white, black, or brown. Half-round or square-line profile. The default option for most UK houses since the 1980s.

How long they last: 20-30 years. The plastic becomes brittle with UV exposure, and joints sometimes fail at the seals.

Pros:

• Cheapest option by a margin
• Quick to install
• Available everywhere
• Lightweight — no special fixings needed
• No painting required
• Modern seal technology is reliable (when new)

Cons:

• Looks like a modern material — doesn’t suit a period property
• Brittle when it ages — particularly after cold winters
• Joints can fail as the seals age
• Not repairable — usually replaced as full runs
• Visibly degrades — yellows, goes brittle, looks tired
• Limited colour range — usually white, black, brown, sometimes grey

Where it makes sense:

• Modern properties (post-1970)
• Budget-sensitive work
• Rental properties
• Anywhere the look doesn’t matter to you

Cast iron gutters

What they are: traditional cast metal gutters, half-round or ogee profile. The standard for Victorian and Edwardian houses. The right answer for most Bath period properties.

How long they last: 50-100+ years when properly maintained. Often the original cast iron on a 1920s Bath house is still doing its job (with patches).

Pros:

• Looks right on a period property — particularly Bath stone
• Lasts generations, not decades
• Repairable — can be patched, re-sealed, repainted
• Develops a protective patina
• Adds to the character of the property

Cons:

• More expensive than uPVC
• Heavier — needs stronger fixings
• Needs painting every 8-10 years
• Sections sometimes need to be replaced individually if badly corroded
• Can be damaged by impact (a ladder leaned against them, for example)

Where it makes sense:

• Period properties — Georgian, Victorian, Edwardian
• Listed buildings and conservation areas (often a requirement)
• Anywhere long-term durability matters
• Where the look matters

Aluminium gutters — the third option

There’s also a middle option that’s becoming more popular: aluminium gutters. Coated in a tough factory finish, half-round or ogee profile, available in a wide range of colours.

How long they last: 30-50+ years.

Pros:

• Lightweight like uPVC
• Looks similar to cast iron
• Wide range of colours including heritage colours
• Doesn’t need painting
• Won’t rust

Cons:

• More expensive than uPVC (similar to cast iron)
• Can dent on impact
• Not as heavy/robust as cast iron
• Looks can be similar to cast iron but not identical

Where it makes sense:

• Period properties where the budget doesn’t quite stretch to cast iron
• Where a specific colour match is needed
• Coastal or harsh environments (aluminium is very corrosion-resistant)

What’s on your Bath house

Most Bath properties built before 1970 have original cast iron gutters. If yours look like painted black metal (and particularly if they’ve got decorative brackets and joints), they’re cast iron. If they look like white plastic, they’ve probably been replaced at some point with uPVC.

The wrong choice for a Bath property

Putting white square-line uPVC on a Georgian or Victorian Bath house is the single most common guttering mistake we see. It looks wrong, ages badly, and the next owner usually replaces it.

For a Bath property, the right order of preference is:

1. Cast iron — restore if possible, replace if not
2. Aluminium — if cast iron isn’t affordable
3. uPVC in black — if budget really matters, at least get it in a colour that doesn’t shout “modern”
4. White uPVC — last resort only

What restoration looks like

For original cast iron that’s still largely sound:

1. Strip the old paint (often back to bare metal)
2. Repair any holes — small patches welded, bigger sections replaced
3. Re-seal the joints — new rubber gaskets or traditional mastic
4. Repaint — typically with a metal primer and two topcoats of satin black

This is much cheaper than full replacement and gives you another 30-50 years.

For badly corroded cast iron (holes, splits, sections missing):

1. Replace affected sections with new cast iron
2. Match the profile — most original cast iron in Bath is half-round or ogee, both still available
3. Repaint everything for a uniform finish

What we usually recommend

If you’ve got original cast iron and it’s got a few rough patches but is fundamentally sound: restore it. Cheaper, longer-lasting, looks better.

If the cast iron is beyond saving: replace with new cast iron. Same look, same longevity.

If the budget doesn’t stretch to cast iron: aluminium in a heritage colour. Looks similar, lasts long.

If budget is the main constraint and you need to make do: black uPVC. Looks reasonable, does the job.

If you’ve got a guttering question, get in touch. We can usually tell from a photo what’s there and what the right answer is.