How to check your roof's condition without climbing up

The short answer: you can learn a surprising amount about your roof’s condition without ever leaving the ground — and you should never climb up to find out. A pair of binoculars, a look in the loft and a free roof report will tell you most of what you need to know, and a free survey fills in the rest.

After four decades on Edinburgh’s roofs, I can usually tell a lot about a roof before I’ve put a ladder anywhere near it. You can too. Here’s how to check your own roof safely, what the warning signs mean, and — just as importantly — what you genuinely can’t tell from the ground.

Start at the street

Stand back across the road, on a clear day, and look up with a pair of binoculars. You’re looking for anything that breaks the neat, even pattern of the roof:

• Slipped, cracked or missing slates. One or two slipped slates is a common, fixable problem. A scattering of them usually means the fixings underneath are starting to go.
• A sagging or dipping ridge line. The top of the roof should run dead straight. A dip or a wave can point to tired timbers or sarking beneath.
• Moss and plant growth. A bit of moss is cosmetic; thick growth holds water against the slate and blocks gutters.
• The lead around the chimney and valleys. Lead flashing is where most leaks actually start. Look for cracks, lifting edges or lead that’s slipped out of the joints.
• Your gutters. Slate or sandy mortar debris sitting in the gutter is a sign of slates breaking down or pointing washing out.

Edinburgh’s tenements and traditional villas were built with natural slate and lead for good reason — they last generations — but they all reach a point where the fixings and flashings need attention long before the slate itself. If you’d like to understand that better, our guide on how long a slate roof lasts in Scotland goes into it.

Look inside the loft

The underside of the roof tells you as much as the top. On a bright day, go into the loft with the light off and look up:

• Daylight coming through the boards where there shouldn’t be any.
• Damp stains or dark water marks on the sarking boards and timbers — especially around the chimney breast and any valleys.
• A musty, damp smell, or timber that’s soft or crumbling to the touch.
• Sagging between the rafters, which can mean water has been getting in for a while.

A torch and ten minutes up there will often reveal a problem months before it shows up as a stain on your ceiling.

Check after every big storm

We get our share of weather up here. After a storm, do a quick ground-level check: look for slipped slates, glance in the garden and gutters for fallen pieces, and keep an eye on top-floor ceilings for fresh damp. Storm damage spotted early is cheap to fix; left alone over a wet winter, it isn’t. If you find an active leak, our guide on what to do when your roof is leaking walks you through the immediate steps.

Get an instant AI roof report

If you want a proper picture in seconds, our free AI roof report does a lot of the legwork for you. Enter your address and it pulls aerial and satellite data to estimate your roof’s area, number of planes and pitch, shows you a satellite and street view, and gives an AI read of the likely material, age and condition — plus an indicative re-roof cost. You can even upload your own photos of a problem area for a closer look.

It’s the quickest way to go from “I think something’s wrong” to a real sense of what you’re dealing with, and there’s no obligation. Be clear on what it is, though: it’s a desktop estimate built from imagery. Which brings me to the important part.

What you genuinely can’t see from the ground

This is where I have to be honest with you, because plenty of roofers wouldn’t be. The things that most often decide whether a roof needs a repair or a re-roof are the things nobody can see from the street, the loft or a satellite:

• The nails and fixings. Old iron nails corrode and fail — we call it “nail sickness.” The slate can be perfectly sound while the nails holding it quietly give up. This is the single most common reason a roof reaches the end of its life.
• The sarking and timber beneath the slate.
• The lead detailing behind chimneys and in the valleys, where a hairline fault can let water track for years.

No app, no drone and no pair of binoculars can confirm those. Only someone getting close to the roof, the right way, can. That’s not a sales line — it’s the difference between a guess and a diagnosis.

Does my roof need replacing or just repairing?

This is the question almost everyone is really asking, so let me answer it directly. The rule of thumb is isolated problems mean a repair; widespread problems mean a re-roof — and it’s usually the fixings, not the slate, that tip it one way or the other.

Signs you likely need a repair:

• One or two slipped, cracked or missing slates in an otherwise tidy roof.
• A single failed flashing or a localised damp patch.
• The roof is sound but a specific detail — a chimney, a valley, a section of lead — has let go.

Signs you may be looking at a re-roof or re-slate:

• Slates slipping in several different places — a classic sign of widespread “nail sickness,” where the fixings have corroded across the whole roof.
• A sagging or dipping roof line.
• The same leak coming back after repeated patch repairs.
• Widespread damp, daylight or soft timber in the loft.

Even then, a re-roof doesn’t always mean tearing everything off. If the slate itself is still good, a re-slate — re-laying the existing or salvaged slate with new nails, membrane and lead — often restores the roof for far less than a full replacement. Our guide on how long a slate roof lasts in Scotland explains why the fixings give out first, and you can read more on the warning signs your roof needs attention too.

When to call a professional

Get a roofer out if you can see widespread problems rather than a single slipped slate, if there’s an active leak or damp inside, if you’re buying the property, or if you’ve had a statutory notice on a shared tenement roof. In every case, a free survey gives you an honest picture and a fixed written price, with no obligation to go ahead.

A ground check, an AI report or a survey — which do you need?

These three aren’t rivals; they’re steps, and most people move through them in order:

• A ground-and-loft check (this guide). Free, instant, no kit beyond binoculars and a torch. It tells you whether something’s worth looking into. Start here.
• A free AI roof report. Enter your address and get approximate measurements, a satellite view, an AI read of the likely material, age and condition, and an indicative cost — in under two minutes. Best when you want real numbers and a quick second opinion without waiting for anyone to call you back.
• A professional survey. The only one of the three that can confirm the fixings, sarking and flashings and turn an estimate into a fixed, written price. With us it’s free and no-obligation.

A sensible path is to do the first two yourself today, then book a survey only once you know there’s genuinely something to act on. That way you’re never in the dark, and you’re never paying to find out.

Whatever you do, stay off the roof

I’ll finish where I started. As a Fellow of the Institute of Roofing, the one thing I’ll always tell a homeowner is this: never climb onto your roof, and don’t go up a ladder for a look. Falls from height are the most serious injuries in our trade, and they happen to experienced people with the right kit — never mind someone borrowing a ladder on a Sunday. Everything in this guide can be done with your feet on the ground, your head in the loft, or a roofer who does this every day.

Want a head start? Run your free AI roof report now, or book a free survey and we’ll give you the full picture.