calculatorsonline.co.uk
UK Single Storey Extension Cost per Sq M Calculator
Single storey extension budget.
home Free Online Tool
⚡ Instant Results
📊 Clear Comparison
🔒 100% Free Tool
Extension cost
Compare Your Options And Get Clear Answers
Single storey extension budget.
UK Single Storey Extension Cost per Sq M Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: Cost = area x rate x (1 + fees)
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
UK Quick Guide
Typical values for reference.
| Extension area (m2) | Cost per m2 (GBP) | Professional fees (%) | Extension cost |
|---|---|---|---|
| 25 | 2300 | 12 | £64,400.00 |
| 40 | 2800 | 15 | £128,800.00 |
| 15 | 2000 | 10 | £33,000.00 |
| 30 | 2400 | 12 | £80,640.00 |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
UK Single Storey Calculator FAQ
Answers to common questions about this calculator.
It uses the formula shown with your inputs. Real conditions vary, so treat it as a guide.
Cost = area x rate x (1 + fees)
It is an estimate based on the inputs you enter. Check real quotes, labels or official guidance for important decisions.
Yes. Replace each input with your own figures and the result updates instantly.