Yes, an aluminium roof lantern is cheaper than timber, both to buy and over its life. A timber lantern typically costs 40 to 70 per cent more than an equivalent aluminium unit, and it needs its internal faces redecorated every eight to ten years, where aluminium’s powder-coated finish needs only cleaning. On purchase price and lifetime maintenance, aluminium wins clearly. The timber premium is justified in one main situation: a listed building, a conservation area, or a period property where a slim modern aluminium frame would look wrong and consent depends on getting the appearance right.
That is the whole decision in miniature. The detail below is for weighing the premium against your particular property, because on a modern house it rarely pays, and on a Georgian frontage it often does. This sits under our main roof lantern installation page.
Purchase price: why aluminium is cheaper
Aluminium is strong enough to be slim, so the glazing bars on a modern aluminium system are narrow and the glass area is high, and the frame is manufactured efficiently in extruded sections. A well-made aluminium lantern also carries a polyamide thermal break, the insulating strip that stops the frame conducting heat straight out of the room. Timber lanterns are usually engineered laminated softwood or hardwood with an aluminium capping over the external face, which is more material, more labour and a more specialist product, and the price reflects it.
| Factor | Aluminium | Timber |
|---|---|---|
| Purchase price | Baseline | 40 to 70 per cent more |
| Ongoing maintenance | Clean only; rinse for salt on the coast | Internal faces redecorated every 8 to 10 years |
| Bar profile | Slim, high glass area | Heavier, lower glass area |
| Finish | Powder coat to a RAL colour, dual-colour available | Painted or stained, external aluminium capping |
| Best on | Modern and recently extended homes | Listed, conservation and period properties |
Lifetime cost, not just the sticker
Purchase price is only half the comparison. A timber lantern’s internal faces need redecorating roughly every eight to ten years to protect the timber and keep the finish, which is either your time or a decorator’s fee, repeated across the unit’s life. Aluminium’s factory powder coat does not need repainting; it needs cleaning, and on the coast a fresh-water rinse once or twice a year against salt film. Over twenty years that maintenance gap widens the aluminium advantage well beyond the purchase difference. Neither material rots if specified and fitted correctly, and both comfortably outlast the mid-2000s units they typically replace.
The premium buys appearance, not performance. A good aluminium lantern matches or beats timber on U-value, glass area and maintenance. What timber gives you is a look, heavier traditional bars and a painted finish, that reads correctly on a period building where slim anthracite aluminium reads wrong. If your property is modern, you are paying the premium for nothing it needs.
When the timber premium is worth paying
There are real cases where timber is the right call and the cost is justified.
- Listed buildings. Listed building consent is required for a lantern regardless of where it sits, and a conservation officer is far more likely to approve a painted timber unit with traditional bar profiles than slim modern aluminium. Here the timber premium is often the price of consent, not a luxury.
- Conservation areas with a visible frontage. Suffolk and north Essex carry an unusually high density of conservation areas, from Lavenham and Dedham to central Ipswich. A lantern visible from a public highway in one of these usually needs a conservation-style unit, and timber with slimmer traditional bars often satisfies that where aluminium does not. Our page on roof lantern planning permission covers the consent position.
- Period properties on aesthetic grounds. On a Georgian or Victorian house, or a Suffolk cottage, some owners simply want the heavier traditional bars because they suit the building, conservation rules or not. That is a legitimate reason to pay the premium. Our page on timber roof lanterns for period properties goes into the detail.
A useful middle path on a less-constrained property is a dual-colour aluminium unit, grey or black outside and white inside for a few hundred pounds more, which reads softer against painted joinery than all-grey aluminium while keeping aluminium’s slim bars and low maintenance. On a modern extension that is often the sensible compromise, and far cheaper than timber.
The coastal footnote
Frame material interacts with exposure on the Suffolk and north Essex coast. Within a mile of open sea at Felixstowe, Harwich, Aldeburgh or Frinton, an aluminium lantern wants a marine-specification powder coating and 316L stainless fixings against salt-laden air, which we fit as standard there and which adds a modest amount to the unit. Timber on the coast needs its external capping and finish specified for the same conditions and its redecoration cycle held to, because a lapsed paint finish on a salt-exposed timber lantern deteriorates faster than the same unit inland. Estuarine towns such as Woodbridge and Manningtree carry moderate salt loading rather than open-sea exposure, so a lighter upgrade is enough. The corrosion detail either way is on our coastal corrosion of roof lanterns page.
Related questions
- How much does a 3m x 2m roof lantern cost fitted? for a worked aluminium price at a common size.
- How much does it cost to replace an existing roof lantern? if you are swapping an old unit.
- Traditional or contemporary roof lantern? for how the look, not just the material, matches the property.
For the full pricing method behind both materials, see what a roof lantern costs.
Get both priced for your property
Tell us the property age and whether it sits in a conservation area, and we will quote aluminium and, where it is the right call, timber, so you can see the real premium for your specific job rather than a rule of thumb. Request a fixed quote for roof lantern installation in Ipswich, Suffolk or north Essex, or see published prices across every service first.
Thinking about this job? We survey across Ipswich, Suffolk and north Essex and give you a fixed price before any work starts, with a 10-year workmanship guarantee.