Greenhouse Tools & Calculators — Sizing, Cost, Planning, Wind
Greenhouse Tools & Calculators
Eight free interactive tools to size, cost, plan, and storm-prep your greenhouse — for NORDIC wood and SteelRoot steel-arch ranges. Built for UK gardeners with real Met Office wind data, UK Permitted Development rules, and realistic 2026 retail pricing.
Wood greenhouse · Sizing
NORDIC Size Calculator
Tell us about your household, crops, and growing season — we'll match you to the right NORDIC size in 60 seconds. Includes floor area maths and realistic yield estimates.
Find my size →Steel arch · Sizing
SteelRoot Size Calculator
Three questions about growing space, site exposure, and install method — we'll match you to the right SteelRoot length (4–12 m) with the engineering rationale and total cost.
Find my length →Step 2 · Value
Greenhouse Yield Calculator
Pick a size and dominant crop — see annual harvest in kilograms and supermarket-equivalent value across beginner, intermediate, and experienced grower scenarios.
Estimate my harvest →Step 3 · Total cost
Total Cost Calculator
True 10-year cost of ownership: kit + base + delivery + maintenance. Compares NORDIC vs cheap aluminium (with replacement) and heritage glasshouse alternatives.
Calculate true cost →Steel arch · Total cost
SteelRoot Cost Calculator
Configure your SteelRoot length, extras and delivery region — see total price with Klarna 0% monthly options. Anchors, vents and door windows already included.
Calculate my total →Step 4 · Planning
Planning Permission Checker
Do you need planning permission? Covers England, Scotland, Wales, Northern Ireland and special area restrictions (listed buildings, conservation areas, AONB, National Parks).
Check my permission →Step 5 · Storm prep
Wind & Anchor Calculator
UK regional wind zone calculator with anchoring recommendations. Based on Met Office wind data and British storm-loading conventions for garden structures.
Check my site →Steel arch · Storm
SteelRoot Wind & Anchor Checker
Map your UK region and site exposure to your Eurocode wind zone — and validate that your kit's included anchors are sufficient for that storm scenario. No upsells, just engineering.
Check my wind spec →The recommended order
If you're starting from scratch, work through these in order:
- Size Calculator — find which NORDIC matches your household and growing ambitions
- Planning Permission Checker — confirm that size fits your plot under Permitted Development
- Wind & Anchor Calculator — check your site exposure and anchoring needs
- Cost Calculator — see the true 10-year total cost vs alternatives
- Yield Calculator — see what the harvest is worth in £ value across a decade
By the end of all five, you'll know exactly which NORDIC size you need, whether it needs planning approval, how it'll stand up in your wind zone, what it costs across 10 years, and what financial value the vegetables alone bring back. About 15 minutes of decision-making, free.
More planning resources
- Waldenhaus wooden greenhouses — main hub
- 9-step buyer's checklist — what to confirm before clicking buy
- What size greenhouse do I need? — practical UK guide
- Wooden greenhouse total cost UK 2026 — detailed breakdown
- UK Permitted Development rules for greenhouses
- Wind-resistant greenhouses — the engineering
- Greenhouse base preparation UK