Last summer, a café owner in Amsterdam spent €22,000 on a beautiful terrace, expecting it to double his revenue. Six months later, he was barely breaking even. The reality? He'd forgotten about winter heating costs, extra staff wages, and the fact that terraces sit empty during bad weather.
The real costs of expansion
A terrace or expansion brings more costs than you think. It's not just about setup costs, but also structural additional expenses.
⚠️ Note:
Many entrepreneurs only calculate setup costs and forget ongoing expenses. A terrace with 20 seats costs you an average of €200-400 extra per month in staff, energy and maintenance - a mistake that costs the average restaurant EUR 200-400 per month.
One-time investment costs
Add up all costs you make once for the expansion:
- Renovation and furnishing: Terrace installation, furniture, heating
- Permits: Terrace permit, possibly expanded hospitality license
- Extra kitchen equipment: If you expect more volume
- Marketing: Promoting the expansion
💡 Example terrace 20 seats:
- Terrace installation: €8.000
- Furniture (tables, chairs): €4.000
- Heating (heaters): €2.500
- Permits: €500
- Unforeseen (10%): €1.500
Total investment: €16.500
Ongoing extra costs per month
These expenses hit your books every single month once you've expanded:
- Extra staff: Service for more tables
- Energy: Heating, lighting, possibly cooling
- Maintenance: Cleaning, furniture repairs
- Insurance: Extension of building insurance
- Municipal charges: Terrace tax
💡 Example ongoing costs:
- Extra staff (0.5 FTE): €1.200/month
- Energy (heating, lighting): €150/month
- Maintenance and cleaning: €80/month
- Insurance: €25/month
- Terrace tax: €60/month
Total extra costs: €1.515/month
Calculate realistic extra revenue
Now for the tricky part: how much extra revenue will you actually generate? Many entrepreneurs get way too optimistic here.
Step 1: Estimate occupancy rate
A terrace doesn't run at full capacity all year round. Be realistic with your numbers:
- Summer months (April-September): 60-80% occupancy
- Winter months (October-March): 20-40% occupancy
- Bad weather: Terrace often empty
Step 2: Calculate average bill
Check your current average bill per table. A terrace often has a lower bill than indoors (more drinks, less food).
💡 Realistic revenue calculation:
Terrace 20 seats, average bill €18 per person:
- Summer: 20 × 0.70 × €18 × 30 days × 6 months = €45.360
- Winter: 20 × 0.30 × €18 × 30 days × 6 months = €19.440
Total extra revenue per year: €64.800
Calculate break-even point
Now you can figure out exactly when your expansion starts making money.
Break-even formula:
Months to break-even = Total investment / (Monthly extra revenue - Extra costs per month)
💡 Break-even calculation:
- Investment: €16.500
- Extra revenue per month: €64.800 / 12 = €5.400
- Extra costs per month: €1.515
- Net extra per month: €5.400 - €1.515 = €3.885
Break-even: €16.500 / €3.885 = 4.2 months
⚠️ Note:
This example assumes 70% occupancy in summer. If your terrace is less busy, it'll take much longer for your investment to pay off. Always run the numbers with a pessimistic scenario first.
Include risk factors
Expansions always carry risks. Factor these into your calculations:
- Weather: A cold summer can cut your terrace revenue in half
- Competition: Other businesses can also expand
- Economy: During downturns people eat out less
- Seasonality: Terrace mainly earns in summer
Always run a scenario where you make 20-30% less revenue than expected. Better safe than sorry.
Alternative calculation: ROI per year
You can also examine the annual return on your investment.
ROI formula:
ROI % = (Annual extra profit / Total investment) × 100
💡 ROI calculation:
- Extra revenue per year: €64.800
- Extra costs per year: €1.515 × 12 = €18.180
- Extra profit per year: €64.800 - €18.180 = €46.620
- Investment: €16.500
ROI: (€46.620 / €16.500) × 100 = 283% per year
An ROI of 283% means your investment pays for itself in 4.2 months. That's excellent - most hospitality entrepreneurs are thrilled with 50-100% ROI per year. But remember, these numbers only work if you hit your occupancy targets.
How do you calculate the profitability of an expansion?
Map out all costs
Make a list of one-time costs (renovation, furniture, permits) and ongoing monthly costs (staff, energy, maintenance). Don't forget 10% contingency for the investment.
Calculate realistic extra revenue
Estimate the occupancy rate per season and multiply by number of seats × average bill × number of days. Be pessimistic - better to be pleasantly surprised than disappointed.
Determine break-even point
Divide total investment by monthly extra profit (revenue minus costs). This gives you the number of months to break-even. Under 12 months is good, under 6 months is excellent.
✨ Pro tip
Track your current table turnover rates for 3 weeks before calculating expansion revenue. Most owners overestimate how quickly they can flip tables during peak hours, leading to inflated profit projections.
Calculate this yourself?
In the KitchenNmbrs app you can do this in just a few clicks. 7 days free, no credit card.
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Frequently asked questions
What is a good ROI for a terrace or expansion?
An ROI of 50-100% per year is solid for hospitality investments. Above 150% is excellent. However, always run your calculations with pessimistic revenue scenarios to avoid nasty surprises.
Should I include seasonal fluctuations in my calculation?
Absolutely essential. A terrace mainly earns during summer months - calculate with 60-80% occupancy in summer and just 20-40% in winter. One cold, rainy summer can completely derail your projections.
How do I factor in weather risk for outdoor seating areas?
Build in a 20-30% revenue buffer for bad weather days. Track local weather patterns from previous years and assume 15-25% of potential terrace days will be unusable due to rain, wind, or extreme temperatures.
📚 Sources consulted
- EU Verordening 852/2004 — Levensmiddelenhygiëne (2004) — Official source
- EU Verordening 853/2004 — Hygiënevoorschriften voor levensmiddelen van dierlijke oorsprong (2004) — Official source
- EU Verordening 1169/2011 — Voedselinformatie aan consumenten (2011) — Official source
- NVWA — Hygiënecode voor de horeca (2024) — Official source
- NVWA — Allergenen in voedsel (2024) — Official source
- Codex Alimentarius — International Food Standards (2024) — Official source
- FSA — Safer food, better business (HACCP) (2024) — Official source
- BVL — Lebensmittelhygiene (HACCP) (2024) — Official source
- Warenwetbesluit Bereiding en behandeling van levensmiddelen (2024) — Official source
- WHO — Foodborne diseases estimates (2024) — Official source
Food Standards Agency (FSA) — https://www.food.gov.uk
The HACCP standards shown in this application are for informational purposes only. KitchenNmbrs does not guarantee that displayed values are current or complete. Always consult the FSA or your local authority for the latest regulations.
Written by
Jeffrey Smit
Founder & CEO of KitchenNmbrs
Jeffrey Smit built KitchenNmbrs from 8 years of hands-on experience as kitchen manager at 1NUL8 Group in Rotterdam. His mission: give every restaurant owner control over food cost.
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