UK shading analysis has a split personality. For an MCS-certified installation the shading assessment has to follow the MCS standard method, which uses a defined overshading procedure and feeds the certified performance estimate. For everything else, a proper hourly model gives a much better answer. Installers who use one where the other is required end up either non-compliant or needlessly imprecise.
Direct answer. The best solar shading analysis software in the UK depends on whether the job is MCS-certified. For MCS work the shading input follows the MCS standard method under MCS 003, which mainstream international platforms do not implement. For commercial and non-certified work, PVsyst and SurgePV both run hourly modelling that handles the UK’s diffuse-dominated sky far better than the MCS procedure was designed to.
TL;DR
- MCS-certified installations use the MCS standard method for shading. It is a procedure, not a simulation, and no mainstream platform runs it.
- UK irradiance is heavily diffuse, which means shading hurts less than a direct-beam model suggests but is harder to estimate correctly.
- Terraced and semi-detached housing produces chimney and neighbour shading that needs 3D geometry, not a horizon profile.
- For commercial rooftop, hourly modelling is the right tool and MCS is usually not in scope.
- Latitude is high, so winter shadows are long even though the sky is dull.
What the UK Actually Changes About Shading Analysis
MCS prescribes the method. For an installation to be MCS-certified, the performance estimate given to the customer follows the MCS standard method, which includes a defined way of accounting for overshading. It is a structured procedure with defined inputs rather than an hourly simulation, and the resulting figure is what the customer is entitled to rely on. A PVsyst or SurgePV output is a better physical model, but it is not the MCS figure. Most UK domestic installers therefore run the MCS calculation for certification and use simulation for their own design confidence.
The sky is diffuse. UK annual irradiance carries a high diffuse fraction. That has a counterintuitive consequence for shading: an obstruction blocking direct beam removes less than the same obstruction would in a sunny climate, because more of the resource arrives from the whole sky dome. Models that treat shading as a simple beam-blocking geometry problem overstate UK losses. Models with a proper sky-dome treatment get closer.
Housing stock creates awkward obstructions. Terraced and semi-detached properties put chimneys, dormers, and neighbouring roofs close to the array. At UK latitudes those cast long shadows for much of the year. Horizon-profile methods miss near-field obstructions of this kind entirely, which is where 3D geometry earns its cost.
Latitude is high. London sits above 51 degrees north and Edinburgh near 56. Winter sun elevation is low, so obstruction shading concentrates in the months when generation is already scarce.
Commercial is a different job. For a warehouse or a car park canopy there is usually no MCS requirement, the array is large, inter-row spacing matters, and hourly simulation is unambiguously the right tool.
The 7 Platforms Ranked for the UK
| Platform | Best for | Hourly diffuse-aware modelling | MCS shading method | Price per seat per year |
|---|---|---|---|---|
| MCS-compliant domestic tools | Certified domestic installations | Varies | Yes, native | Subscription, GBP |
| PVsyst | Commercial and detailed studies | Best in class | No | ~$500 |
| SurgePV | Shading plus design in one license | Yes, 8,760-hour | No | $1,299 to $1,899 |
| Easy PV | UK domestic workflow | Yes | Closest to native | Subscription, GBP |
| HelioScope | Commercial rooftop | Yes | No | ~$1,188 |
| Aurora Solar | Complex roof geometry | Yes, LIDAR | No | $1,908 to $3,108 |
| SketchUp plus Skelion | Bespoke geometry | Manual | No | ~$700 plus plugin |
PVsyst handles the UK’s diffuse sky and near-field obstruction geometry better than anything else on the list, and its 3D near-shading scene builder is the right tool for a terrace with chimneys. See PVsyst price.
SurgePV carries 8,760-hour shading into the layout, string design, and single-line diagram, which suits commercial rooftop work where the whole package is needed.
Easy PV is built for the UK domestic workflow and sits closest to the MCS process in general commercial use.
Try the software behind this guide
Hourly shading for the commercial roof, drawings included
SurgePV runs 8,760-hour shading against a full 3D obstruction scene, then carries the same model into string design, single-line diagrams, and AutoCAD DWG export.
Book a free SurgePV demo →No credit card. 20-minute walkthrough on one of your own projects.
What a UK Shading Deliverable Has to Contain
- MCS shading assessment following the standard method, where the installation is MCS-certified.
- 3D obstruction model covering chimneys, dormers, neighbouring roofs, and vegetation.
- Hourly shading loss with monthly breakdown, for design confidence and commercial work.
- Diffuse treatment stated, since a beam-only model overstates UK losses.
- Per-string or per-module loss table identifying compromised positions.
- Inter-row pitch derivation for flat commercial roofs, against the winter sun path.
- Optimiser or microinverter rationale where shading justifies module-level electronics.
Item 7 is a commercial decision the shading study should drive. On a shaded UK terrace, module-level electronics frequently pay for themselves. On a clear commercial roof they usually do not, and recommending them anyway is a margin decision dressed as an engineering one.
Pricing in Pounds
| Stack | USD per year | Approx. GBP at 0.79 | Covers |
|---|---|---|---|
| PVsyst | ~$500 | ~£395 | Detailed shading and yield |
| HelioScope | ~$1,188 | ~£939 | Commercial layout and shading |
| SurgePV | $1,299 to $1,899 | ~£1,026 to £1,500 | Shading plus full design |
| Aurora | $1,908 to $3,108 | ~£1,507 to £2,455 | Sales-grade shading plus proposal |
Exchange rate is illustrative. UK-market tools quote in GBP.
What Most UK Installers Get Wrong
They substitute a simulation output for the MCS figure.
The simulation is usually the better physical model. It is still not the MCS performance estimate, and on a certified installation the customer is entitled to the figure produced by the standard method. Running both, using MCS for certification and simulation for design decisions, is the correct posture and takes very little extra time.
The second mistake is treating UK shading as a beam-blocking problem. With a high diffuse fraction, an obstruction removes less than pure geometry suggests, and installers who model it as a hard shadow talk themselves out of viable positions on shaded terraces.
When Software Is Not the Answer
If commercial enquiries stall because nobody can produce a layout, a shading study, and a compliant single-line diagram quickly, that is engineering capacity rather than a software gap.
Our solar rooftop detailed engineering design and solar 3D pre-design services cover exactly that, with sales-stage 3D and shading models turned around in 48 hours. See the sample design pack or talk to our team.
Conclusion
- Run the MCS method for certified work. A simulation output is not a substitute for the standard method’s figure.
- Use a diffuse-aware model. Beam-only geometry overstates UK shading losses.
- Model near-field obstructions in 3D. Chimneys and neighbouring roofs are the dominant UK domestic shading source.
In this country series: solar software in the UK, best solar design software in the UK, best solar proposal software in the UK, Pvsyst review. Tool deep dives: Helioscope review, Aurora Solar review.
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Disclosure and accuracy note
Commercial relationship. Heaven Designs and SurgePV are part of the same group. Treat our recommendation of SurgePV as a vendor making its own case, not an independent verdict. We have tried to describe every other product fairly, and to say plainly where a competitor is the better choice.
Pricing. All prices are indicative, compiled from public sources when this page was written. They vary by tier, region, contract term and exchange rate, and change without notice. Several vendors quote rather than publish, and some price in currencies other than the US dollar, so a converted figure moves with the exchange rate. Confirm current pricing with the vendor before you decide anything.
Trademarks and corrections. All product names and trademarks belong to their respective owners, and are used here for identification and comparison only. Their use does not imply affiliation with or endorsement by those companies. If anything here is out of date or wrong, tell us and we will correct it.
FAQ
What is the best solar shading analysis software in the UK? For MCS-certified domestic work, a UK-market tool that implements the MCS standard method. For commercial and non-certified work, PVsyst for rigour or SurgePV where the license also has to produce the design.
Does MCS require a specific shading method? The MCS performance estimate follows a defined standard method that includes an overshading procedure. It is not an hourly simulation, and mainstream international platforms do not implement it.
Why does the UK’s diffuse sky change shading analysis? Because a large share of UK irradiance arrives from the whole sky rather than as direct beam. An obstruction therefore removes less than pure shadow geometry suggests, and beam-only models overstate the loss.
Do I need 3D modelling for a UK domestic roof? For terraced and semi-detached properties, yes. Chimneys, dormers, and neighbouring roofs are near-field obstructions that horizon-profile methods miss entirely.
Should shading drive the choice of optimisers? It should. On a shaded terrace module-level electronics often pay for themselves, and on a clear commercial roof they usually do not. Let the shading study make the argument.
How much does solar shading analysis software cost in the UK? From roughly £395 per year for PVsyst alone to £2,455 for Aurora’s higher tiers, with UK-market tools quoted separately in GBP. Full math is in our solar design software pricing breakdown.
Related: the wider tool decision is in best solar design software in the UK, and the method in how to do shadow analysis for solar rooftop projects.
