Solar Mounting System Manufacturers

Solar panels get the attention, but they only work if the hardware holding them to a roof is up to the job. That hardware, the rails, roof hooks, clamps and ballasted frames, is made by a distinct group of manufacturers, and in the UK their products sit inside a certification scheme of their own. MCS, the Microgeneration Certification Scheme, counted 181 manufacturers of MCS certified solar panel products as of July 2024, and mounting kit is certified separately from the panels it holds¹. Over two million smaller-scale solar installations are now online across the UK, largely on homes, according to MCS data², and official planning for the sector notes over 1.5 million domestic solar installations in the UK as of 2025³.

The mounting layer matters to a household for three reasons. First, it is the part of the system that has to survive wind, snow and decades on a roof. Second, its certification status affects whether an installation qualifies for grants and export tariffs. Third, it is a supply chain most householders never think about: the overwhelming majority of panels installed in the UK are imported⁴, and the mounting systems are largely European-made, so the two halves of a rooftop array often come from different industries altogether.

What a mounting system maker actually builds

A solar mounting system manufacturer does not make panels, inverters or batteries. Its products are the structural layer between a panel and a building: the rails that run under a row of panels, the fixings that grip the panel frame, and the roof attachments that transfer the load into the rafters or, on a flat roof, into ballast. Van der Valk Solar Systems, a Dutch maker whose pitched-roof range is documented for the UK market, describes the choice plainly: solar panels on a sloping roof are attached with roof hooks, clamps, hanger screws or profiles, and the panels themselves are held either with panel clamps or an insert system⁶.

The same maker's guidance captures the two requirements every mounting product exists to meet: "Always ensure a firm attachment and a good waterproof finish."⁶ Every hole drilled in a slate or tile is a potential leak, so the design of a hook, flashing and seal is as much a part of the product as its strength. Which solution suits a given roof depends, in the maker's words, on "your roof and the substructure"⁶.

Mounting is not only about panels, and not only about roofs. Solar thermal technologies, which heat water rather than generate electricity, are also usually roof-mounted panels containing a network of liquid-filled tubes heated by the sun⁷. Welsh Government guidance notes that solar collectors can alternatively be wall mounted or stand-alone free-standing structures, and that photovoltaic systems can even be found in a roof tile form, mounted vertically and horizontally to form part of the building structure⁸. HMRC's manual on energy saving materials likewise draws the boundary widely, covering roof-mounted solar panels and ground-mounted panels within the curtilage of residential accommodation⁹. So the mounting industry spans roof hooks, in-roof trays that replace tiles, flat-roof frames, ground-mount structures and building-integrated products.

The makers supplying UK roofs

The UK mounting market is served by a small number of specialist manufacturers, nearly all of them European. Renusol, a German maker, supplies pitched-roof and flat-roof systems documented for the UK, including the VS+ and the Variosole range¹⁰. Van der Valk Solar Systems, also from the Netherlands, publishes UK-facing guidance covering roof tiles, slate, corrugated sheets, standing seam, trapezoidal and sandwich panels, and bitumen, EPDM and PVC pitched roofs, claiming solutions for every type of roof⁶. K2 Systems, another German specialist, is profiled separately on this site at K2 Systems solar mounting for UK roofs, alongside the wider picture in solar panel manufacturers and solar inverter manufacturers.

The scale of the certified supply base is worth noting. MCS counted 181 manufacturers of certified solar panel products by July 2024¹, and MCS product certification covers a defined list of technologies including solar PV, solar mounting, small wind turbines, heat pumps, biomass, solar heating and micro CHP¹¹. Mounting therefore sits inside the same certification ecosystem as the panels, even though the companies are largely different ones.

Where the mounting makers differ from the panel makers is in geography. The overwhelming majority of panels installed in the UK are imported, according to a government consultation on the solar supply chain⁴, and Which? reports that around 80% of panels available in the UK are made in China, including those from Trina Solar¹². The mounting layer is an exception: the brands a UK installer is likely to quote, such as Renusol and Van der Valk, are European, and one British-owned company, UKSOL, supplies solar products in the UK and internationally to almost 50 countries across five continents¹³.

Renusol: the VS+ rail system and the Variosole UK tile hook

Renusol's UK-documented range illustrates how a mounting maker divides its products by roof type. The VS+ is described by the maker as a modular design system, suitable for nearly all types of pitched roofs in Europe¹⁰. Its specification is built around two mounting rails for medium and high load, and a single clamp design the maker summarises as "One clamp for all applications"¹⁰. For a householder, that modularity is what allows an installer to adapt the same family of components to different tile shapes, rail spans and load conditions rather than switching to a different product line for each roof.

The Variosole UK flat tile is Renusol's universal PV mounting solution for pitched roofs, developed around the flat pan tiles that are common on British houses¹⁰. The name refers to the tile profile it is designed to sit on, and it is a pitched-roof product despite the word "flat" in its title, which refers to the tile, not the roof. Renusol also documents a reference project, the VS+ IFP, listed as covering both flat roof and pitched roof applications¹⁰, showing how the boundaries between product families blur where a building has both roof types.

What a maker's own pages do not tell you is whether a given product is currently certified. Renusol describes its products' design and suitability; certification status is held by MCS and changes independently of the maker's catalogue, as the events of 10 May 2025 demonstrated¹⁴. A household buying a Renusol, Van der Valk or K2 system is therefore buying on two separate grounds: the maker's engineering claims, and the certification listing, which is the part a grant scheme or export tariff will actually check.

Choosing between sloping and level roofs for your home

Official guidance is unambiguous that both roof types can take solar. Hammersmith and Fulham Council states that solar panels can be installed on both pitched and flat roofs, and that on a flat roof the panels will need to be tilted to maximise output and spaced to avoid shading one another¹⁵. Energy Saving Trust confirms that flat-roof installation is possible, with more flexibility over panel angle, but notes it is more complex: panels may need additional mounting systems, the roof must support the extra weight, and it might cost more than a pitched-roof installation¹⁶. Which? likewise reports that, contrary to popular belief, solar panels can be installed on flat roofs¹⁷.

The hardware follows the roof type. On a pitched roof the array is fixed directly into the roof structure, using roof hooks, clamps, hanger screws or profiles, with panels held by clamps or an insert system⁶. On a flat roof the array sits on tilted frames, and since penetrating a flat roof membrane is the last resort, many systems are held down by ballast instead. That is why flat-roof work costs more: there is simply more mounting product between the panel and the building, and the roof has to carry it¹⁶.

Van der Valk's guidance for installers applies to either roof: "Always choose a system that suits your roof type and follow the manufacturer's installation instructions."⁶ The practical consequences for a household are set out in the table below.

Certification: MCS 012, the 2025 decertification and the custom route

Mounting systems are certified under MCS 012, The Solar Mounting Product Standard. On 10 May 2023 MCS published an update to that standard, MCS 012 v3.0, which expanded its scope to include non-mechanically attached mounting systems, in addition to mechanically attached ones, designed for installation on flat roofs of up to 10 degrees⁵. That expansion was significant for UK homes because most domestic flat-roof arrays are ballasted, that is, non-mechanically attached, and before v3.0 there was no standard route to certify them.

The standard then hit a crisis. On 10 May 2025, several solar mounting products lost certification to MCS 012¹⁴. MCS subsequently extended a grace period for the affected products, and advised affected manufacturers to reach out to all available certification bodies that offer solar mounting certification¹⁴. MCS has also said it will review MCS 012 to address the challenges manufacturers face and enable certification of non-mechanically attached products⁵. For a householder, the practical lesson is that a mounting product's certification is a status, not a permanent property: it can be gained, lost and regained, and the check that matters is the one made at the time of installation.

There is also a custom route. Under clause 5.5.5 of MIS 3002, the solar PV installation standard, a custom designed mounting system may be used where no MCS 012 certified mounting systems suitable for a given installation exist, subject to two specific conditions being met⁵. MCS's March 2026 update to MIS 3002 spells out what installers must hold when they use that route: "Completed structural and wind loading calculations in relation to the specific mounting system being installed."¹⁸ The clause exists precisely for installations where there are no certified mounting systems available under MCS 012¹⁸.

How MCS certification protects the homeowner too

MCS certification can look like an installer's paperwork problem, but it reaches into a household's money. An MCS certificate is, in the words of guidance on the scheme, "a record that your solar installation has been done by a certified installer using certified products", and it is required when accessing some grants and incentives²⁰. Energy Saving Trust notes that having panels installed by an MCS-certified installer may be a requirement to sign up for export tariffs¹⁶. The old Feed-in Tariff scheme made the point in its official guidance: installations needed MCS-certified equipment installed by an MCS-certified installer²¹.

Public schemes write the requirement in directly. The Barcud solar panel installation scheme in Wales specifies that the installing company must carry a valid Trustmark and be MCS certified, and that solar PV systems should only be installed and certified by MCS certified contractors working to the latest published MIS 3002 standards²². Guidance on solar heating makes the same point for that technology: certified installers use MCS certified products, including solar heating panels and mounting kits²³. Ofgem's Boiler Upgrade Scheme guidance describes MCS simply as "a certification scheme for microgeneration installation companies and products"²⁴.

So when a mounting product loses MCS certification, as happened on 10 May 2025¹⁴, the household consequence is not abstract. An installation built on a decertified mounting product may not produce the certificate needed for a grant or an export tariff, and the certificate is also the record a future buyer of the house may ask to see. The mounting brand is therefore worth asking about at quote stage, even though it is the least visible part of the array.

Must your panels and mounting come from the same maker?

No, and in practice it almost never does. Panels and mounting systems are made by different industries, and the clamps that hold a panel are designed around standard frame dimensions rather than around a particular panel maker. What the evidence does show is that householders rarely get much choice of panel brand in the first place. Which? found that almost three quarters of the solar panel owners in its survey only had one brand of panel offered by their chosen installer, while 14% had a choice between two brands²⁵, a figure repeated in its January 2026 survey²⁶. Among JA Solar owners, 13% said they chose that brand from several brands recommended by their installer²⁵.

The choice a householder can exercise is over the installer, and official advice points that way. East Herts Council advises householders to note the manufacturer's recommendations for the panel model they choose²⁷, and Bromley Council advises getting various quotes to compare prices of different installers²⁸. Asking each quoting installer which mounting system they intend to use, and whether it is currently MCS certified, is a reasonable part of that comparison.

One habit carries across from the panel to the mounting: registration. Electrical Safety First advises that as with any electrical appliance, a plug-in solar panel system should be registered with the manufacturer to activate any warranty and to be contacted about any problem or safety recall²⁹. The same logic applies to mounting hardware, whose warranties are long precisely because the product is expected to stay on a roof for decades. More on this in manufacturer warranties and registering a warranty.

Viewing assembled systems at industry exhibitions

Mounting hardware is hard to judge from a datasheet. A rail cross-section, a hook profile and a ballast frame make sense when seen in the hand, and the UK's main industry event is where that happens. Solar & Storage Live UK runs in Birmingham, with the 2026 edition held from Tuesday 22 to Thursday 24 September, an event listed by mounting maker Van der Valk Solar Systems alongside its UK product information⁶.

For a householder, a trade show is less about buying than about seeing the range of what exists: pitched-roof rails next to flat-roof frames, in-roof trays, and the ballasted systems that dominate domestic flat-roof work. It is also where the certification conversation is live, since the 2025 decertification events¹⁴ and the review of MCS 012⁵ have made mounting a talking point across the industry. The scale behind the event is the market itself: over two million smaller-scale installations online, largely on homes², and over 1.5 million domestic installations in the UK as of 2025³.

Mounting's role in cutting reliance on the grid

Mounting is the least glamorous layer of energy independence, but it is the layer that decides where generation can physically go. HMRC's definition of what counts as solar for energy saving materials includes roof-mounted panels and ground-mounted panels within the curtilage of residential accommodation⁹, and Welsh Government guidance widens it further to wall-mounted and free-standing structures⁸. A household whose roof is shaded, weak or awkward is not excluded from generating: the mounting industry exists to put panels on the buildings and ground that exist, not just on ideal south-facing pitches.

The direction of travel is toward more of it. The UK Government is set to include requirements in its Future Homes Standard for most new builds in England to have solar panels³⁰, which will make mounting systems a standard part of English housebuilding rather than a retrofit choice. Alongside that, plug-in solar panels are now available to buy and use across Great Britain³¹, major retailers have worked with the UK government on their rollout, with availability in stores and online³², and industry bodies reported them available in shops "within months" for existing homeowners as of March 2026³³. UKSOL's plug-in product line became the first to reach key UK compliance ahead of consumer launch¹³.

What mounting does not change is the dependence that remains. A certified mounting system holds panels to a roof; it does not remove the household's reliance on the grid for the hours the panels are not generating, on an installer and certification body for the paperwork that unlocks export payments, or on manufacturers, largely European for mounting and largely Chinese for panels⁴, for the hardware itself. The mounting layer is the enabler: it is what turns a roof into a power station. The independence it buys is real, over 1.5 million British homes already have it³, but it is independence of generation, not of supply.