The verdict in three sentences
A solar EPC company website in London costs between 15,000 and 40,000 GBP in 2026, delivered in 6 to 8 weeks. Against an average ticket of 350,000 to 450,000 GBP for a 500 kWp commercial rooftop, the margin on one project won through the site covers it almost twice over. The three things that get a facilities or finance director to sign are a savings calculator, quantified case studies and proof of financial strength.
What a plant manager or hotel CFO expects
The buyer compares a non-domestic electricity rate of roughly 22 to 28 pence per kWh (2026 estimate) with a solar levelized cost around 7 to 10 pence per kWh. Your website must make that calculation obvious and credible.
| Page or feature | Commercial goal | Key content | Indicative cost (GBP) |
|---|---|---|---|
| ROI-led home page | Grab the CFO's attention | MWp installed, cumulative savings, client logos | Included |
| Savings calculator | Generate a qualified lead | Annual bill, roof area, estimated capacity, payback | 4,000-9,000 |
| Case study pages | Prove track record | Capacity (kWp), annual yield, savings, drone photos | 2,000-4,000 |
| Sector solution pages | Speak to each target | Manufacturing, logistics, hospitality, healthcare | 2,500-5,000 |
| Funding options | Remove the budget objection | Purchase, lease, PPA, zero-capex models | 1,500-3,000 |
| Investor and accreditation section | Reassure funds and tier-one clients | MCS, NICEIC, ISO 9001, financials | 1,500-3,500 |
| Live generation dashboard (option) | Retain and upsell | Client portal connected to inverters | 8,000-18,000 |
Three budget levels
| Package | Scope | Price (GBP) | Timeline | Maintenance per month |
|---|---|---|---|---|
| Essential | 10-12 pages, case studies, survey request form | 15,000-20,000 | 6 weeks | 400 |
| Growth | + savings calculator, sector pages, blog | 22,000-30,000 | 7 weeks | 600 |
| Premium | + funding options, investor section, CRM, advanced SEO | 31,000-40,000 | 8 weeks | 800-1,200 |
| Template site (comparison) | Theme, no calculator | 4,000-8,000 | 3 weeks | 150 |
| Large London agency (comparison) | Same scope as Premium | 60,000-120,000 | 12-16 weeks | 2,500 and up |
The calculator remains the best-performing investment: on installer websites it typically drives 40 to 60 % of survey requests (2026 estimate), with pre-qualified data such as consumption, roof area and location.
SEO and tenders
Queries like "commercial solar installer London" or "solar PPA for warehouses UK" are competitive but winnable with sector content. Two articles a month on Smart Export Guarantee rates, business rates relief and case studies typically build rankings in 6 to 9 months. Procurement teams and funds check your references online before shortlisting you for frameworks.
Mini case study
James, sales director at a London solar EPC contractor (100 kWp to 5 MWp systems), invests 26,000 GBP in a Growth site plus 600 GBP a month, or 33,200 GBP in year one. The calculator generates 12 qualified survey requests a month. At a 3 % conversion rate, that is about 4 projects a year. A single 500 kWp project at 400,000 GBP with a 15 % gross margin brings in 60,000 GBP, almost twice the annual cost of the site.
Need a professional website?
Kolonell builds websites that attract clients, optimized for the Sénégalese market. Free quote in 2 minutes.
FAQ
Does the calculator need to be very precise?
No, it needs to be credible. An estimate within plus or minus 15 % is enough to trigger a survey request, precision comes from the site visit.
Can we show live generation from our installations?
Yes, through inverter APIs (SMA, SolarEdge, Huawei). Budget 8,000 to 18,000 GBP depending on the number of connected sites.
Should we name our clients?
With written consent, yes. Otherwise, "food manufacturer, Essex, 750 kWp" remains very convincing.
How fast will the site load?
We target under 2 seconds on mobile, with WebP images and Core Web Vitals in the green.
What does a French version add?
For EPCs bidding on African or European projects, a second language costs about 3,000 to 6,000 GBP depending on page count, professional translation and SEO included.
Let's scope your project. Send us your 5 best case studies and priority sectors, and we will price a website between 15,000 and 40,000 GBP, delivered in 6 to 8 weeks. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
