Add up your gutter runs to work out the total guttering length, how many standard lengths to buy and the estimated cost.
Guttering is sold in fixed lengths, so measuring each run carefully means you buy the right number of sections without paying for materials you do not need. Under-ordering leads to an extra trip and a part-finished job, while over-ordering wastes money. Measuring along the fascia at the eaves and adding each roofline run together gives you the total length to work from.
In the UK, uPVC guttering is most commonly supplied in 4 m and 2 m lengths, while in the US and Canada sectional gutters are often sold in 10 ft lengths and seamless gutters are cut on site. Half-round and square (or K-style) profiles are the most popular. For most homes a 112 mm–115 mm gutter with a 68 mm downpipe is suitable, while larger roofs or high-rainfall areas may need a deeper high-capacity profile.
Your total cost depends on the number of standard lengths required multiplied by the price per length. This calculator rounds up to whole sections because you cannot buy a partial length. Remember to budget separately for fittings such as union brackets, running outlets, stop ends, angles and downpipes, plus fixing brackets – these are not included in the length estimate.
Measure along the fascia board at the eaves for each section of roof that needs guttering, working in metres or feet. Add every run together to get the total length. Include any returns around corners and note where downpipes will go, as these affect the fittings you need.
In the UK, uPVC guttering is most commonly sold in 4 m and 2 m lengths. In the US and Canada, sectional gutters typically come in 10 ft (about 3 m) lengths, while seamless aluminium gutters are formed to size on site. Enter the standard length you plan to buy so the calculator can work out how many sections you need.
For most houses a standard 112 mm–115 mm (roughly 4.5 in) half-round or square gutter with a 68 mm downpipe is sufficient. Larger roof areas, steep pitches or regions with heavy rainfall may need a deeper high-capacity gutter to cope with the volume of water.
Guttering lengths are connected using union brackets (joint clips) fitted with rubber or foam seals. Clip one gutter length in, then the next, leaving the small expansion gap marked inside the fitting so the plastic can expand and contract without leaking.
Prices vary by material and profile, but a standard uPVC gutter length often costs somewhere in the region of £8–£15 (roughly $10–$20) per section, with fittings priced separately. Enter your actual price per length and currency above for an accurate total for your project.
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