The short answer
Seamless aluminium gutters are formed on site from a flat coil of aluminium by a roll-forming machine, so each straight run is one unbroken length with no joints along it. Joints remain only at corners, outlets and end caps. They suit long, plain elevations and houses where leaking joints have been a repeat problem.
How a gutter is made on your drive
Ordinary plastic guttering arrives in lengths of a few metres and is clipped together with joint unions, each with a rubber seal. A continuous aluminium gutter is made differently. The fitter brings a roll-forming machine, usually mounted on a van or trailer, and feeds a flat coil of pre-painted aluminium through it. The rollers bend the strip into the gutter profile, and the finished piece comes out as long as the wall needs, cut to size on the spot.
That is the whole idea behind the name. There is no seam along the straight run because the length was never assembled from shorter pieces. The gutter is lifted up, fixed to the fascia on brackets, and the ends are shaped to meet the next part of the system.
The coil comes in a range of factory-applied colours, so the finish is baked on in a factory rather than painted on site. Dark, light and neutral shades are all stocked, and the colour should be agreed before the machine is switched on, because a cut length cannot be swapped for another shade.
Where joints still remain
The name promises more than the product delivers if you take it literally. A run of guttering has to turn corners, meet downpipes and stop at the end of a wall, and those points are all joined by hand. Corners are mitred and sealed, outlets are cut into the gutter and sealed, and stop ends are fixed with sealant and small rivets.
So the gain is fewer joints, not none. On a plain gable-to-gable run with a single outlet, that can mean the long middle section has nothing in it that can drip. On a house with bays, returns and a rear extension, the number of corner joints is much closer to a conventional system, and the benefit shrinks.
A good fitter seals every one of these points with a suitable sealant and checks them with water before leaving. Ask which sealant is used and whether the joints are riveted as well as sealed, because sealant alone can ease off with movement.
Where the system suits, and where it does not
Continuous aluminium earns its place on long, simple elevations: a detached house with a wide rear wall, a row of garages, a school hall or a unit with a long eaves line. Fewer joints means fewer places for a seal to dry out, which is the usual way a plastic gutter starts to drip.
It is also a sound choice where the fascia is straight and sound, because a long rigid length shows every dip in the board behind it. If the fascia is bowed or the brackets have loosened, the fault will be visible in the gutter line.
It suits less well on short, heavily broken runs, on very old buildings where cast iron is part of the character, and on terraces where a gutter is shared with the house next door and cannot be replaced in isolation. Our page on gutter profiles sets out the shapes that fit each kind of roofline, and the bracket spacing page explains how a gutter is held up once it is made.
Materials, thickness and what drives the cost
Aluminium does not rust, which is its main advantage over steel, and it is light enough to lift as a long length. It can dent if a ladder leans against it, and a thin gauge will sag when it fills with leaves. The thickness of the coil, the depth of the profile and the number of brackets all decide how well it holds its line.
For comparison, MyBuilder's roofline price guide (updated 21 August 2026) gives guttering replacement as £30 to £70 per metre across the UK. That is a national figure for gutters generally, not a price for this system or for your house. What moves the cost on a real job is the height of the eaves, whether scaffolding is needed, the number of corners and outlets, and whether the fascia behind needs attention first.
It is worth asking any firm quoting for aluminium whether the price includes VAT and access equipment, so each figure you receive means the same thing.
Looking after an aluminium gutter
Continuous or not, a gutter does its job only while it can carry water. Leaves, moss and roof grit still collect in the channel and the outlets, and a blocked outlet will overflow whatever the gutter is made of. A tidy-up once or twice a year, particularly after leaf fall, keeps the fall working. The blocked downpipe page covers what to do when the outlet is the problem.
Aluminium needs no repainting in the way that cast iron does, so cleaning is mostly a matter of removing debris and wiping off any dirty film. Avoid harsh abrasives that scratch the factory finish.
If you are weighing up materials for the fascia that will carry the gutter, our page on fascia and soffit materials is the next read. For the full range of work we do at the eaves, see gutters, soffits and fascias.
If your existing gutter only needs resealing or re-aligning, we will tell you that rather than sell a new run. Where a new system is the right answer, the survey photographs come with a written quote, and the work carries our 10-year workmanship guarantee in writing. The old gutter leaves with us when we go.