Rewilding Garden Calculator
Rewilding garden savings.
Calculate the cost savings from rewilding a garden versus conventional lawn maintenance across the years you keep it that way.
What this tool does
This calculator models the financial outcome of converting a managed garden into a rewilded space. It estimates your annual savings from reduced maintenance and the net financial position over five years. The result accounts for the initial setup investment, any grants available for biodiversity work, and the ongoing maintenance cost reduction once rewilding is complete. The calculation assumes maintenance drops by approximately 30% after conversion. Results are most sensitive to your current annual maintenance spend and the setup cost required. This tool illustrates a five-year snapshot and does not account for changes in maintenance costs over time, future grant availability, or variations in how quickly ecosystems establish. Typical users explore this when evaluating whether upfront rewilding investment offsets long-term savings on garden upkeep.
Enter Values
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Formula Used
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Disclaimer
Results are estimates for educational purposes only. They do not constitute financial advice. Consult a qualified professional before making financial decisions.
Rewilding gardens replaces high-maintenance lawn with low-maintenance native habitat. Setup cost: 200-2,000 for typical garden (wildflower seed, native shrubs, removing turf). Ongoing maintenance drops to ~30% of conventional lawn cost (mowing 2x/year vs weekly, no fertilizer, no pesticides). Some councils now offer biodiversity grants 200-2,000 for rewilding projects.
200sqm garden × 600 annual conventional maintenance reduces to 180 rewilded. Annual savings 420. 500 setup + 200 grant = 300 net first-year cost. Year 2 onwards: pure 420/year savings. 5-year savings: 2,100 - 300 first year cost = 1,800 net. Plus environmental benefit unmeasured.
Beyond cost savings: rewilded gardens support biodiversity (pollinators, birds, hedgehogs), reduce flood risk (better water absorption than lawn), capture more carbon, and need no irrigation. Property values can increase 5-10% with attractive native landscaping vs neglected lawn. Multiple benefits beyond pure financial return.
A worked example
Try the defaults: garden size of 200, current maintenance annual of 600, rewilding setup of 500, biodiversity grant of 200. The tool returns 420.00. You can adjust any input and the result updates as you type — no submit button, no reload. That's the real power here: seeing how sensitive the output is to one or two assumptions.
What moves the number most
The result responds to Garden Size (sqm), Current Maintenance Annual, Rewilding Setup, and Biodiversity Grant.
The formula behind this
Reduced maintenance = current × 30%. Annual savings = current - reduced. Net first year = savings + grant - setup. Everything the calculator does is shown in the formula box below, so you can check the math against your own spreadsheet if you want.
Beyond the number
Carbon, health, and local air quality don't show up on the calculator but often drive the decision. The financial figure is a lower bound on the value; the rest is whatever you'd pay for the non-financial benefits.
What this doesn't capture
Carbon reduction, health benefits, and local air quality have real value the financial figure doesn't price. The calculation gives the money side honestly; for the full picture, note the non-financial benefits alongside.
200sqm × ££600 → ££600*0.3 maintenance + ££200 grant - ££500 = 420.00.
Inputs
This example uses typical values for illustration. Adjust the inputs above to match a specific situation and see how the result changes.
Sources & Methodology
Methodology
The calculator computes annual maintenance savings by applying a 30 percent reduction factor to your current annual maintenance cost, reflecting typical labour and material reductions under rewilding management. It then calculates net first-year benefit by subtracting the upfront rewilding setup cost from the sum of annual savings and any biodiversity grant received. The model assumes a uniform 30 percent maintenance reduction applies regardless of garden size or current practice, treats all setup costs as one-time expenses in year one, and does not account for ongoing biodiversity grant eligibility, future maintenance cost inflation, labour cost variations, or regional differences in rewilding implementation. Results represent a simplified projection based on stated inputs alone.
References
Frequently Asked Questions
Is rewilded garden 'tidy'?
What plants?
How long until established?
Can I sell/let property?
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