Walk down any Victorian street in Camden and you’ll see black half-round gutters with that distinctive beaded profile, running along ornate fascia boards. That’s cast iron — the original guttering on most of London’s period housing. When it comes time to replace it, the question is always the same: repair or replace like-for-like in cast iron, or switch to modern uPVC? Here’s an honest comparison from a roofer’s point of view.

What you’re comparing

Cast iron guttering is exactly what it sounds like: gutters (and usually downpipes) cast from iron, traditionally painted black. On period houses it’s often the original 100+ year-old system, still going. Modern cast iron is available new from specialist manufacturers.

uPVC guttering is the modern standard: lightweight plastic half-round or ogee-profile gutters, usually black, white, or brown. It’s what goes on the vast majority of replacement jobs across the UK today.

Looks: cast iron wins on period houses

This is the big one. Cast iron has a deep, crisp profile — the classic ogee or beaded half-round — that sits right on a Victorian or Edwardian facade. uPVC, even in black, has a flatter, more plasticky look, and the brackets and joints are visibly different. From the street, a period house with uPVC gutters just doesn’t look quite right.

In conservation areas, this isn’t just aesthetics — replacing cast iron with uPVC can breach planning rules. Camden has extensive conservation areas, so check before you switch materials. If you’re replacing the whole eaves detail, read our guide to fascias and soffits services too.

Lifespan and durability

Properly maintained cast iron lasts 50–100 years — we regularly work on original Victorian gutters still doing their job. The enemy is rust: if the paint is kept up (repainting every 5–8 years), cast iron is extraordinarily long-lived. Neglected, it rusts through at the joints and bolt holes.

uPVC lasts around 20–30 years. It doesn’t rust, but it becomes brittle with UV exposure, sags between brackets in heat, and cracks in hard frosts. It’s a shorter-life product, full stop — but 25 years is a long time in a house you may not own forever.

Cost: uPVC wins comfortably

There’s no getting around it: cast iron costs several times more than uPVC, both in materials and labour (it’s heavy and slower to fit). As a 2026 London guide:

uPVC guttering replacement, 3-bed terrace: £600–£1,200
Cast iron guttering replacement, same house: £2,500–£5,000

Repairing existing cast iron — replacing a rusted section, re-sealing joints, repainting — is usually far cheaper than full replacement and keeps the original character. If the system is mostly sound, repair is nearly always the sensible option.

Maintenance

Cast iron needs its paint maintained — that’s the deal. Miss the repainting cycle and rust takes hold. uPVC needs virtually no maintenance beyond cleaning, though sagging runs may need re-bracketing over time. If you’re the kind of homeowner who never wants to think about gutters again, uPVC has the edge.

Noise and performance

Cast iron is quieter in heavy rain — the mass of the metal deadens the drumming you get on plastic gutters. Both carry water equally well when correctly sized and hung at the right fall. Neither is inherently “better” at drainage.

What about aluminium guttering?

Worth a mention as a third option: aluminium sits between the two. It looks far closer to cast iron than uPVC does — crisp profiles, proper brackets — lasts 30–40 years, never rusts, and needs no painting. It costs more than uPVC but noticeably less than new cast iron. For period houses outside conservation areas, where you want the traditional look without the repainting cycle, aluminium is often the sweet spot. The catch is fewer stockists and installers, so get a specialist quote rather than assuming your general roofer carries it.

Our honest recommendation

Keep and repair cast iron if it’s original to a period house and mostly sound — a section replaced here, joints re-sealed, and a proper repaint will give decades more life at a fraction of replacement cost.
Replace like-for-like in cast iron if the system is beyond repair and you’re in a conservation area, or the house’s character genuinely matters to you (and your resale value).
Switch to uPVC if budget is the priority, the house isn’t in a conservation area, and you’re happy to trade some character for a maintenance-free 25 years.

One caution: don’t mix the two on the same run. Cast iron and uPVC expand at different rates and the joints between them are a perennial leak point. If you’re switching, switch the whole run — gutter, downpipes, and shoes.

For pricing context, see our gutter replacement cost guide and our fascia and soffit replacement costs. And if your current gutters are misbehaving rather than worn out, our article on water running behind the gutter may save you a replacement altogether.

Get advice on your gutters

Not sure whether yours are worth saving? Victoria Roofing Expert Ltd is a family-run roofing contractor at 188 Camden High St, London NW1 8QP, serving Camden and all of London since 1982. We’ll inspect your guttering, give you straight advice on repair vs replacement, and quote both options where it makes sense. Fully guaranteed workmanship, 5.0 from 338 Google reviews. See our guttering services for the full range.

Call 07848 256099 — open 24 hours — or request a free quote via our contact page.