☀ Solar Panels for New Builds
Coordinating your solar PV team with your architect — RIBA Stage 2 onwards — UK new build solar PV installation
For self-builders

Coordinating your solar PV team with your architect — RIBA Stage 2 onwards

Solar PV works best when integrated from RIBA Stage 2 concept design. We explain the architect coordination workflow, from form factor through to construction stage.

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Architect Coordination for Self-Build Solar — UK self-build solar PV guidance

Self-builders who bring in their solar PV partner late — at RIBA Stage 4 or even later — usually pay more, get a smaller array than the roof can carry, and end up with a less integrated finish. The right time to involve us is RIBA Stage 2.

RIBA Stage 2 — concept design

At concept design we provide initial sizing, an indicative kWp range, and form-factor guidance to your architect. We never dictate form, but we flag the trade-offs: "a 30° south-facing roof gives 6 kWp; the asymmetric design you're proposing limits you to 3.5 kWp; here's the cost in lifetime savings."

RIBA Stage 3 — developed design

Detailed array layout, structural loadings, inverter location and cable routes are agreed. Output is a DWG-compatible roof layout drawing your architect can incorporate. SAP/HEM preliminary modelling begins.

RIBA Stage 4 — technical design

Specifications written into the tender pack: panel make/model, inverter, in-roof mounting, monitoring, MCS sign-off, warranty. SAP/HEM compliance pack finalised. Building Control submission supports.

RIBA Stage 5 — construction

In-roof mounting installed before tiling/slating. We coordinate directly with your main contractor and roofer. Panels and inverter follow during second fix. Commissioning, MCS, EPC and handover at completion.

Beyond completion (RIBA Stage 7)

20-year insurance-backed workmanship warranty, remote monitoring, annual performance review, and proactive fault detection. We are your single point of contact for any future warranty claim on panels, inverter or workmanship.

40% of ground floor area
PV / ground floor area
Mar 2027
FHS in force
75%
CO₂ vs 2013 baseline
£4,350 per dwelling
Per-plot premium
For self-builders and architects

Architect coordination for self-build solar for one-off custom builds

Engagement from RIBA Stage 2. PV sizing collaborative with the architect. SAP/HEM modelling that gives the architect freedom on glazing ratios and roof geometry. Building Control submission pack ready for the Approved Inspector. 0% VAT on new-build dwellings. Staged invoicing aligned to your self-build mortgage drawdowns. We work with custom-build buyers across England, Wales and Scotland.

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How this fits into the FHS compliance pathway

Every FHS-compliant new build must pass three regulatory gates. Architect coordination for self-build solar fits primarily into the second gate — design-stage Part L compliance — but has knock-on implications for Building Control sign-off and post-completion warranty:

  1. 1
    Planning permission Most solar PV on new dwellings is consented within the dwelling\'s primary planning consent. Conservation Areas, Article 4 directions and listed-curtilage plots require additional planning consideration — we handle the planning evidence required for these.
  2. 2
    Building Control — Part L compliance SAP 10.3 or HEM compliance modelling demonstrating Dwelling Emission Rate ≤ Target Emission Rate. PV specification, ASHP capacity, fabric U-values and air permeability all entered into the modelling. We provide the full compliance file ready for the Approved Inspector.
  3. 3
    Post-completion — warranty & EPC MCS certificate, EPC, monitoring app onboarding and 20-year insurance-backed workmanship warranty. NHBC, LABC, Premier and Buildmark all accept our installation specification without query — important if you\'re relying on a structural warranty for buyer mortgageability.

For a fuller walkthrough of the compliance process, see our Part L 2026 page and the FHS PV calculator which sizes a compliant system from your ground floor area in 30 seconds.

Frequently asked

Self-build questions

Answers to the questions we get most often when discussing architect coordination for self-build solar with new clients.

Can I self-build a home that exceeds FHS specifications?
Yes — and the marginal cost of exceeding FHS is small relative to the long-term running cost benefit. A typical "FHS-plus" self-build specification: 6 kWp array (vs 3.4 kWp minimum on a 3-bed), 13 kWh battery, air permeability target 1.5 (vs FHS 3), PassivHaus-style thermal bridging detail. Capital premium over FHS minimum: £8,000–£12,000 on a £400k build budget. Running cost saving: ~£500/year, plus a clear EPC band A rating that adds 4–6% to resale value at 2026 prices.
Will my Approved Inspector understand FHS — or will Building Control sign-off be slow?
Approved Inspectors and LABC officers across England have been training to the FHS dual-route (SAP and HEM) compliance pathway since the consultation response in Q4 2025. Most are now confident on Part L 2026. The slowest area is HEM modelling — the new dynamic simulation engine has a steeper learning curve than legacy SAP. Most submissions in 2026 are being filed under the SAP 10.3 route during the transitional period, with HEM adoption growing through 2027.
When does the Future Homes Standard come into force?
24 March 2027 in England, with a 12-month transitional period running to 24 March 2028 for projects already under construction. The Approved Documents L and F were published on 24 March 2026 (Government statement HCWS1445), giving the industry exactly 12 months of certainty before regulatory commencement. Scotland, Wales and Northern Ireland are following with broadly equivalent regulations on roughly aligned timetables, although devolved nuances apply — Welsh regulations are typically 6 months ahead.
What does FHS-compliant solar PV actually cost per plot?
The Government Impact Assessment puts the total FHS premium at ~£4,350 per dwelling per dwelling (2025 prices, weighted average across heat pump, solar PV, MVHR and enhanced fabric). Of that, solar PV is roughly £4,200 — covering ~3.4 kWp for a typical 3-bed semi (panels, in-roof mounting, inverter, monitoring, MCS certification and 20-year insurance-backed warranty). Larger dwellings cost proportionately more; volume procurement reduces per-plot cost by 20–25%.
FHS 2027 deadline approaching

Book a free self-build consultation

Tell us your plot details — ground floor area, location and target start-on-site date. We return a fully-costed system sized to Part L 2026 (40% PV rule), with the SAP/HEM compliance pack included.

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