Should you install solar on a west or east-facing roof? When it works and when to skip it (UK 2026)

Short answer: West-facing and east-facing solar panels absolutely work in the UK. You’ll produce 10 to 20% less annual electricity than south-facing panels, but if your home is empty or quiet at midday and busy mornings/evenings (typical UK pattern), you can actually save more money because your generation matches when you use electricity.

When west/east-facing works:
- Your home is empty or low-demand between 11am-3pm (work, school)
- You’re home mornings and/or late afternoons (breakfast spike, cooking, evening usage)
- You have two decent roof slopes and want more total panels
- You’re a shift worker, retiree, or work from home outside midday hours

When to skip west/east-facing:
- You have high daytime demand at midday (or can schedule it)
- You only have space for a few panels and need maximum output per panel
- One roof slope is heavily shaded
- You have an excellent export tariff where midday surplus isn’t “wasted”

Check if your roof works: Free postcode calculator shows exact savings for your roof direction and usage pattern.

If you want to compare your options properly (not just guess), this guide explains when west/east-facing saves you more, how much output you actually lose, and how to decide for your specific roof and household.

We’ll anchor examples across the UK, from high-output regions like BH1 (Bournemouth) to darker northern postcodes like AB15 (Aberdeen City).

Postcode examples used in this guide:

• CT1 (Canterbury)
• GU1 (Guildford)
• BH1 (Bournemouth, Christchurch and Poole)
• B29 (Birmingham)
• YO1 (York)
• M20 (Manchester)
• SA1 (Swansea)
• AB15 (Aberdeen City)

You will also see a few spot references to:
- LE1 (Leicester)
- G12 (Glasgow City)
- BT9 (Belfast)

How much electricity do you actually lose with west or east-facing solar?

Check your roof: SolarByPostcode postcode calculator

What we are assuming

Before we get into the numbers, here’s what this guide assumes:

• Your roof is broadly usable for solar (no severe shading most of the day, no structural constraints that force a single layout).
• We’re comparing like-for-like periods (season and weather swings can dwarf small layout differences).
• Results vary most with roof pitch, shading, and when your household uses electricity (quiet midday vs busy mornings/evenings).
• Export value depends on your tariff, so “more kWh” is not always “more savings”.
• For how SolarByPostcode estimates local output and savings, see Data sources and methodology.

Why “less generation” doesn’t mean “worse savings”

This is the part most guides get wrong.

A south-facing array produces a bigger midday peak.

A west/east-facing array (or east-west split) produces a flatter, wider curve.

That shape difference determines how much solar you can actually use versus how much you export.

For most UK homes:

• Self-used kWh replaces imported electricity at your unit rate (24-30p/kWh typically)
• Exported kWh pays at your export rate (often 4-15p/kWh)

So even if west/east produces fewer kWh overall, it can deliver similar or better savings if it increases the share you use at home.

Here’s the simplified trade-off:

This is why “south is best” is only half true.

South is usually best for raw kWh output.

But for actual savings, west/east can match or beat south if your household timing is right.

Why typical UK households often save more with west/east-facing panels

Most UK households have a demand pattern like this:

• Morning spike (kettle, showers, breakfast, school run)
• Midday dip (house empty or quiet, everyone at work/school)
• Late afternoon and evening spike (cooking, lights, screens, laundry)

That pattern exists whether you live in CT1 (Canterbury) or M20 (Manchester).

The problem with south-facing for this pattern:
- Massive midday peak when you’re not home
- Most generation gets exported at low rates
- Little generation during evening peak when you need it

How west/east-facing helps:
- East panels cover morning spike
- West panels extend into late afternoon/early evening
- Less midday waste, more usable generation

If you want regional baselines:

• South East England — often highest midday surplus waste
• Southern — strong summer peaks, export matters
• North West England — lower peaks, timing matters more
• North Scotland — limited winter generation, don’t over-optimise for midday

West/east doesn’t create more energy. It creates more usable energy.

When south-facing is clearly the better choice

South-facing wins when at least one of these is true:

1) You have high daytime demand (or can create it)

If someone is home all day, or you can reliably schedule loads at midday, a south-facing peak is easier to exploit.

Examples:
- Home office in GU1 (Guildford) with daytime usage
- Household with heat pump, hot water scheduling, EV charging at midday
- Retirees with flexible appliance timing

2) You have a strong export tariff

If your export rate is unusually good (12-15p/kWh or higher), export becomes less “wasteful”.

In that case, maximising total kWh can be closer to maximising value.

3) You’re constrained by roof space

If you can only fit a few panels, squeezing maximum kWh out of each panel matters more.

A compact south-facing array on a smaller roof in CT1 (Canterbury) can outperform an east-west split.

4) One slope is heavily shaded

If your west-facing slope is shaded by trees or buildings for meaningful parts of the year, don’t split your panels.

Concentrate everything on the cleaner south or east-facing slope.

If your confusion is driven by graphs and peaks:

• Cloud cover vs solar output: what actually happens on overcast UK days
• Why your solar panels will never hit their rated output (and why that’s completely normal)

When west/east-facing is the smarter choice

West/east wins when at least one of these is true:

1) Your home is empty or low-demand at midday

This is extremely common.

If your midday generation is mostly exported, a bigger peak doesn’t help your bill much.

A flatter profile reduces export and raises self-use.

Typical in: B29 (Birmingham), YO1 (York), M20 (Manchester) — anywhere with standard 9-5 schedules.

2) You have two decent roof slopes and want more panels

Many UK roofs are built for east-west splits.

If your only “good” roof is small, going east-west can allow a larger total system size without dumping everything into a midday peak.

Especially helpful in high-summer regions like Southern.

3) You want better morning and late afternoon generation

East-facing panels help cover the morning spike.

West-facing panels extend into late afternoon and early evening.

Good match for typical household patterns in SA1 (Swansea) or M20 (Manchester).

4) You’re worried about inverter clipping on bright days

A very peaky south-facing system can hit inverter limits during bright midday periods.

Spreading generation across the day reduces peak power and can reduce clipping.

Not always major in the UK, but can show up in higher-yield areas like BH1 (Bournemouth).

How UK region affects the decision

UK latitude and cloudiness change the baseline.

A south-facing system in the South East has different “headroom” than one further north.

Regional baselines before comparing screenshots:

• South East England
• Southern
• West Midlands
• East Midlands
• North West England
• North Wales + Merseyside
• South Wales
• North Scotland

Practical intuition:

• South East (e.g. CT1 (Canterbury)) — more total generation, question becomes “how do I use it?”
• Further north (e.g. AB15 (Aberdeen City) or G12 (Glasgow City)) — winter generation limited anyway, over-optimising for midday peak is wrong instinct

Simple decision framework (actually works in real homes)

Choose south-facing (or mostly south) if:

• You have one clearly best roof and limited space elsewhere
• You’ll regularly use electricity at midday (or can schedule it)
• Your export rate is strong and export isn’t “wasted”
• You want maximum annual kWh from limited panels

Choose west/east-facing (or east-west split) if:

• Your midday demand is low and export would dominate
• You want generation earlier and later in the day
• You have two decent roof slopes and want larger total system
• You want flatter profile to support self-use and reduce midday waste

Not sure? Your postcode baseline will make it obvious.

Check your roof: SolarByPostcode

How batteries and tariffs change the decision

A battery changes the story but doesn’t remove the trade-off.

• A battery can capture some midday excess from south-facing
• West/east still helps by reducing battery burden with shoulder-hour generation

If pairing solar with storage, aspect matters, but sizing and economics matter even more:

• Solar system sizing in the UK: choosing the right kWp without wasting money

When NOT to worry about “perfect” south-facing

UK homes rarely have textbook roofs.

Your “south-facing” roof might actually be south-east or south-west.

That often behaves more like a partial east-west shift than people expect.

If you’re already slightly off-south, forcing everything onto “south” can be worse than spreading across two slopes for better timing.

Common mistakes that lead to wrong decisions

“South-facing means my panels will hit rated output”

Not in the UK.

Real output explanation:

• Why your solar panels will never hit their rated output (and why that’s completely normal)

“West/east is bad because it produces less”

It produces less total kWh.

Real question: does it produce less valuable kWh for your household?

“My friend’s south-facing system is better, so south must be best”

A system in BH1 (Bournemouth) and one in M20 (Manchester) aren’t comparable without controlling for weather, latitude, and usage.

Benchmark locally first.

Common questions

Do west-facing solar panels work in the UK?

Yes. West-facing panels produce 20-25% less than south-facing, but if you’re home late afternoon/evening (typical UK pattern), they can save you more money because generation matches when you use electricity. Use a postcode calculator to see actual savings for your roof.

Do east-facing solar panels work in the UK?

Yes. East-facing panels produce 20-25% less than south-facing, but excel at covering morning demand (breakfast, showers, school run). Great for households with morning usage spikes. Combined with west-facing panels (east-west split), you get 10-20% less total but better timing match.

How much less do west-facing solar panels generate than south-facing?

West-facing panels typically produce 20-25% less annual kWh than equivalent south-facing panels. An east-west split (panels on both slopes) produces 10-20% less. The exact figure depends on roof pitch (flatter roofs narrow the gap), shading, and location. The trade-off is west panels generate more in late afternoon when many UK homes have high demand.

Should I install solar if I only have a west-facing roof?

Yes, if you’re home late afternoons/evenings or can shift usage to match generation (EV charging, hot water, washing machine). Skip if you have high midday demand and little evening usage, or if your roof is heavily shaded in afternoon. Use postcode calculator to see if it makes financial sense.

Is an east-west split better than south-facing?

For many UK households, yes — especially if you’re out 11am-3pm and home mornings/evenings. East-west produces 10-20% less total kWh but spreads generation across the day, reducing wasted midday export. South-facing wins if you have high midday demand or limited roof space. Check your postcode for specific comparison.

Does west/east-facing work better in northern UK?

The timing benefits exist everywhere. Total winter generation is lower in northern regions like North Scotland, so be especially careful not to over-optimise for a single “perfect day” concept of solar.

Should I do east-west if I’m getting a battery?

A battery makes midday surplus more useful, but east-west still helps by reducing how concentrated your generation is. Best result is usually good roof coverage plus realistic sizing, not obsessing over orientation when you have storage.

Next reads

• Roof pitch for solar in the UK: what changes, what barely matters, and what to do with a “bad” roof
• Shading and solar panels: when a single tree really does matter
• Aspect penalty map: how roof direction changes UK solar yield
• Solar system sizing in the UK: choosing the right kWp without wasting money
• Self-consumption vs export in UK solar: how the Smart Export Guarantee changes the maths

Bottom line

• West-facing and east-facing solar panels produce 20-25% less than south-facing
• East-west splits produce 10-20% less than south-facing
• But: Lower total generation can mean higher savings if it matches your usage pattern
• In the UK, timing often matters more than peak output
• Best choice depends on your postcode, tariff, and when your home uses electricity

Check if your roof works — free postcode calculator