Solar Panels On Slate And North-Facing Roofs In The High Peak, Stockport And Greater Manchester

How Panels Fix To A Slate Roof

Slate makes that harder than concrete tile. It is thin and brittle, so the slates around each hook have to be lifted, trimmed or swapped for a fitting slate, and an old slate can crack under a careless knee. Expect a few replacement slates on the job list, and ask whoever quotes how they deal with breakages and what they match the new slates to.

Stone slate, the thicker and heavier kind you see on older Peak District cottages, adds a second question: whether the rafters carry the extra load of rails and panels on top. That gets answered by looking in the loft, not from the street, and our lead engineer goes up there on the survey so the answer comes before the price.

Welsh Slate, Stone Slate And Tile

Three roof coverings turn up most often between the Hope Valley and south Manchester, and each one asks something different of the fixing.

We price your roof once we have seen which of the three it carries and what state it is in, so the quote covers the slates you have, not an average roof.

Sort The Slates Before The Panels Go On

Old slate roofs often fail at the nails before the slates themselves. Once the nails corrode, slates slip out of line, and every slipped slate under a panel array means taking panels off to reach it. Any repair is cheaper with the scaffold already up and the roof bare.

So we look over the roof itself at the survey, and you hear about loose slates or rotten battens before anything else gets priced.

Panels last for decades, so the roof under them has to last as long. If the slates are near the end of their life, with many slipped, cracked or held on by tingles, re-roofing first saves taking the panels off and putting the scaffold up a second time a few years later. If your roof needs doing first, we tell you at the survey, before you spend anything on panels.

Wind, Snow And Pigeons On A Hillside Roof

A roof on the hills above Glossop or Buxton takes stronger wind and more snow than a sheltered one in Stockport. The number and spacing of the roof hooks should follow the loads for your site, so ask how the installer worked out the fixings.

Snow tends to slide off a tilted panel sooner than off the slates around it, and output drops while it lies. On a north-facing slope low in a High Peak valley, frost and snow can linger on the panels well into a winter morning, which is one more reason that slope needs its own figure. Rain washes most of the dust off a pitched array, so panels on a slope need little cleaning.

Pigeons are the other visitor. The sheltered gap under the panels makes a good nest, and the mess and noise follow. Mesh guards around the edge of the array keep the birds out, and they are cheaper to fit with the scaffold up.

Lewis looks at how exposed your roof is, and whether birds already roost on it, when he surveys it, so the fixings and any guards are on the quote from the start.

North, East And West Slopes

A north-facing slope is the weak case. It sees less direct sun, and the steeper the pitch, the more it loses. A shallow north slope gives up less than a steep one, which is why a single rule of thumb won’t settle your roof.

An installer’s estimate should start from a yield figure for your roof’s direction, pitch and location, then apply a shade factor for anything that blocks the sun. Ask to see both numbers. If a north slope is the only one your house has and the figures come out thin, we’ll tell you the panels aren’t worth fitting.

Splitting Panels Between Two Slopes

An east-west roof can carry panels on both sides of the ridge. The two halves peak at different times of day, so they need wiring as separate strings into an inverter with two inputs, or panel-level electronics, so the shaded or dimmer side doesn’t drag the other down.

The split suits a house that uses power in the morning and early evening, which is when the east and west slopes do their best work. A solar battery can then carry the afternoon’s output into the evening, and we size it from your bills, not the roof.

Chimneys, Gables And The Valley Side

On a lot of High Peak roofs, shade can cost more than direction. Your own chimney stack, the gable of the house next door or the hillside across the valley can each throw shadow across the panels for hours on a winter afternoon.

Planning For Panels On A Slate Roof

Slate makes no difference to the planning rules. Under Class A of the permitted development rules (GPDO Schedule 2, Part 14, as amended in August 2026), panels on a pitched roof can sit up to 0.2 metres off the slope and no higher than the highest part of the roof, chimneys excepted. A listed home needs listed building consent first, and a council can withdraw the allowance for a whole street with an Article 4 direction.

In the High Peak that question goes to High Peak Borough Council or, inside the National Park, to the Peak District National Park Authority. Where consent is needed, you apply for it, and the install goes ahead once the authority grants it.

Older Stone Houses In Greater Manchester

Across Greater Manchester the borough council for your address decides. An older stone house there, in Marple Bridge or Mellor say, is the case to check for listing or an Article 4 direction before anyone orders panels, and we check both at the survey, so the paperwork comes before the scaffold.

Six Questions For Whoever Quotes Your Slate Roof

Put the same questions to each installer and the quotes become comparable:

We answer all six on paper with the design, before any scaffold goes up, and the install carries our two-year workmanship guarantee.

The design and a fixed price follow in writing, and you can read how install day runs, from scaffold to switch-on, on our solar PV installation page.