STRUCTURAL SURVEYS FOR SOLAR PV IN NORTHERN IRELAND
A structural survey for solar panels in Northern Ireland establishes whether an existing roof can carry the weight of the array, the wind uplift on it and the design snow load for the site. Loads are set from BS EN 1991 with the UK National Annexes, which cover Northern Ireland, and the structure is checked with regard to Part D (Structure) of the Building Regulations (Northern Ireland) 2012 and Technical Booklet D. Solar Surveys provides on-site structural surveys, drone roof condition assessments, Desktop Structural Roof Loading Reports and drone technical surveys. On-site surveys are quoted per building, with a 24-hour target for quotes.
COMMERCIAL SOLAR PV IN NORTHERN IRELAND
The roofs solar is going onto
A large share of the commercial roof area in Northern Ireland sits on agricultural and food buildings: poultry houses, cattle and dairy sheds, crop stores, and meat and dairy processing plants. Alongside them are portal frame industrial units, distribution sheds, retail parks and a public estate of schools, leisure centres and health buildings.
Agricultural frames are often light, and many older sheds are roofed in fibre cement or asbestos cement. The array itself is rarely the problem: a typical array adds about 0.13 kN/m², panels and mounting together. What decides the answer is how much of the roof's capacity is already used, and the wind and snow the site has to be designed for.
COMMON BUILDING TYPES
- Agricultural and poultry buildings
- Food, meat and dairy processing plants
- Portal frame industrial and distribution units
- Retail parks and business parks
- Schools, leisure and public buildings
EXPOSURE
Open water on three sides
Under BS EN 1991-1-4 and its UK National Annex, wind load is built up from a basic wind velocity for the site, then adjusted for altitude, direction, terrain and distance from the shoreline. Much of Northern Ireland is close to open water, and coastal and upland sites are assessed for stronger winds than sheltered sites inland.
For a rooftop array the wind effect that matters most is uplift, and it concentrates at the edges and corners of the roof. An array does not need to be heavy to overload a roof in suction. The fixings, and the purlins or rails they load, are checked for uplift as well as for weight.
HOW WIND IS TREATED
- Basic wind velocity from the UK National Annex for the site
- Altitude, direction, terrain and shoreline distance included
- Edge and corner zones identified on the roof plan
- Fixings and purlins checked for uplift as well as weight
- Set out in our Assessment Specification
SNOW AND ALTITUDE
Snow is usually the larger load
On most roofs the design snow load is a larger figure than the array. BS EN 1991-1-3 and its UK National Annex set the ground snow load from the site's location and its height above sea level, so a shed on higher ground around the Sperrins, the Antrim plateau or the Mournes is designed for more snow than one at sea level.
In our UK Roof Plane Dataset 2026, the median commercial roof used 61% of its capacity below 50 m altitude and 92% at 150 m and above, with PV and snow combined. The same building gives a different answer on higher ground.
WHAT WE SET FOR EACH SITE
- Ground snow load from the UK National Annex
- The site's own altitude, not a regional average
- Drift at valleys, parapets and abutments
- Plant, services and coverings as built
- PV and snow combined against the roof's capacity
OLDER ROOFS
Fibre cement and asbestos cement roofs need a decision first
Many older industrial and agricultural roofs are sheeted in fibre cement or asbestos cement. The sheets are brittle and fragile underfoot, the fixings were not specified with an array above them, and corrosion at purlin cleats and frame connections is common.
Before solar goes on, the owner usually has to choose between overcladding the roof, stripping and replacing the sheets, or using another building. Each choice changes the load on the frame in a different way.
We survey the frame, purlins and connections, compare the options with and without PV, and where the roof is to be renewed we design the strengthening and the new roof structure. See roof refurbishment and overcladding engineering.
WHAT THE SURVEY RECORDS
- Frame, rafters or trusses, purlins and bracing, measured on site
- Connections, cleats and bearings, with corrosion noted
- The covering and rooflights, recorded from the air
- Added plant, services and second coverings
- A recommendation the contractor can price from
ENGINEERING SERVICES
How we assess a roof in Northern Ireland
Each service stands alone or combines under one instruction.
ON-SITE STRUCTURAL SURVEY
A qualified structural engineer measures the frame, purlins, spans and fixings on site and checks them against the proposed array. The route for undocumented buildings, older roofs and anything a funder or insurer will look at closely.
DRONE ROOF CONDITION ASSESSMENT
The condition of the covering, rooflights, gutters and flashings recorded from the air, with nobody on the sheet. On a fragile roof it is the safe way to see the covering.
DESKTOP STRUCTURAL ROOF LOADING REPORT
A remote appraisal by the same Eurocode method, from drawings, photographs and measurements. Used by MCS installers for homes and smaller commercial roofs, and to screen an estate before deciding where to survey.
ROOF REFURBISHMENT AND OVERCLADDING
Structural appraisal and design for re-roofing, overcladding and strengthening older industrial and agricultural buildings, with or without solar PV.
WHY SOLAR SURVEYS IN NORTHERN IRELAND
What you get from us
Loads for the site itself
Wind and snow are set from the UK National Annexes for the building's own location, altitude and exposure.
Measured on site
A qualified structural engineer measures the structure. Nothing is assumed from a typical building of the same type.
Capacity and condition together
The report covers what the roof can carry and the state it is in, so repairs are priced in before the panels go on.
Survey to design
Where a roof needs strengthening or renewal, the same engineers design it and inspect the finished work.
FREQUENTLY ASKED QUESTIONS
Questions we are asked about roofs in Northern Ireland
Do you carry out structural surveys for solar panels in Northern Ireland?
Yes. We survey commercial, industrial and agricultural roofs across Northern Ireland from our Glasgow head office. Survey dates are agreed when the quote is accepted.
Which standards apply in Northern Ireland?
The British Standard versions of the Eurocodes with the UK National Annexes, which cover Northern Ireland, and Part D (Structure) of the Building Regulations (Northern Ireland) 2012 with Technical Booklet D. Wind actions are taken from BS EN 1991-1-4 and snow loads from BS EN 1991-1-3.
Does MIS 3002 apply to solar installations in Northern Ireland?
MCS is a UK scheme, and its solar PV installation standard, MIS 3002 V6.0, applies to MCS installations in Northern Ireland as it does elsewhere in the UK. From 18 June 2026 it requires the roof structure to be checked before an array goes on. The universal check may be made by a suitably competent person, and the standard names a qualified structural engineer for certain roofs, including ballasted systems on flat roofs. See MCS compliance.
How much does a structural survey for solar panels cost in Northern Ireland?
On-site structural surveys are quoted per building, because the fee depends on the size and type of roof, the access and the location. Desktop Structural Roof Loading Reports start from £130 for homes and £150 for commercial roofs. Send the address, photographs and any drawings, and we aim to return a quote within 24 hours.
Can solar panels go on an asbestos cement or fibre cement roof?
Sometimes, but the roof needs assessing first. The sheets are fragile, and the fixings and purlins were not designed with an array above them. We check the structure and set out the options: overclad, strip and replace the sheets, or use a different roof. Work that disturbs asbestos falls under the Control of Asbestos Regulations (Northern Ireland) 2012 and stays with the asbestos contractor. See roof refurbishment and overcladding engineering.
Do you also cover the Republic of Ireland?
Yes. Sites in the Republic are assessed to the Eurocodes with the Irish National Annexes. See structural surveys in Ireland.
COMMISSION ENGINEERING IN NORTHERN IRELAND
Ready to Proceed?
Send us the site address, photographs of the roof and of the frame inside, any drawings, and the proposed array if you have it. We aim to confirm scope and return a quote within 24 hours.