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Build a hot-tub patio.
Reinforced patio base for hot tub — engineered concrete slab sized for filled tub weight (2-4 tonnes).
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Four moves that separate a smooth job from a nightmare.
Tub tilting over months
— base undersized or not level. Reinforced concrete prevents.
Electrical trip
— wrong RCD or undersized cable.
Splash damage to wooden decking
— chlorinated water damages softwood decking. Use hardwood or composite.
Drainage clogging
— leaves, debris around base. Plan accessible drains.
Costs & timeline
Know what it costs. Know when it ends.
Indicative UK ranges and a typical week-by-week schedule.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
Concrete base (per m²)For 3×3m tub: ~£500–£1,000
£50–£110/m²
Paved base (per m²)If using paving instead
£80–£180/m²
Electrical installInc. RCD, certified install
£500–£1.5k
Surrounding patio (per m²)Standard install
£80–£180/m²
DrainageChannel drain at base
£200–£800
Hot tub base + 10 m² surroundInc. electrical & drainage
£2k–£5k
!
Quote spread is typically ± 18% — always get 3 quotes.
Timeline
30 m² patio install · week by week
Typical
4 phases · 2 wk
4 phases · 2 wk
W1
W2
Lift + excavate
Sub-base + screed
Lay slabs
Joint + clean
!
Schedule slips on dependencies — pad each phase by 10–20% for real-world delays.
At a glance
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A hot tub patio is a specialised installation — the base has to take 1,500–2,500 kg of weight evenly distributed, the electrical supply has to be properly rated and certified, and the surround has to handle constant water and chlorinated splash. This guide covers what hot tub patio installations cost in 2026 (just the patio side, not the tub itself), the base specifications, and the install detail.
Without the right base, a hot tub will tilt over months — first making the water unstable, eventually damaging the tub shell.
What Does the Work Involve?
- Hot tub-specific concrete base — typically 100 mm thick, reinforced.
- Or paving on a heavy-duty sub-base — minimum 150 mm MOT Type 1, paved with at least 50 mm slab thickness.
- Electrical supply — RCD-protected dedicated circuit, Part P compliant.
- Drainage at the base perimeter for routine emptying.
- Surround patio — typically wider patio around the tub for access and seating.
Typical Costs
| Item | Low £ | High £ | Notes |
|---|---|---|---|
| Concrete base (per m²) | 50 | 110 | For 3×3m tub: ~£500–£1,000 |
| Paved base (per m²) | 80 | 180 | If using paving instead |
| Electrical install | 500 | 1,500 | Inc. RCD, certified install |
| Surrounding patio (per m²) | 80 | 180 | Standard install |
| Drainage | 200 | 800 | Channel drain at base |
| Hot tub base + 10 m² surround | 2,000 | 5,000 | Inc. electrical & drainage |
Most owners install the patio with hot tub purchase — coordinate the contractor and supplier.
How Long Does It Take?
- Base only: 2–3 days.
- Base + surround patio: 1–2 weeks.
- Including electrical: add 1–2 days.
DIY or Professional?
Concrete base laying is DIY-possible. Electrical work is NOT — must be done by a Part P certified electrician. Hot tub installation requires both, so professional install is the safer choice.
Choosing the Right Tradesperson
- Confirm base spec matches your tub's weight (manufacturer documents).
- Electrical work must be Part P certified.
- Discuss drainage for emptying (every 3 months typically).
- Discuss the cover lifter and step access integration.
UK Regulations
- Electrical install must be Part P certified.
- Some local authorities require notification for hot tub installation (rare).
- Standard planning rules apply to any patio over 5 m² in front gardens.
Common Problems
- Tub tilting over months — base undersized or not level. Reinforced concrete prevents.
- Electrical trip — wrong RCD or undersized cable.
- Splash damage to wooden decking — chlorinated water damages softwood decking. Use hardwood or composite.
- Drainage clogging — leaves, debris around base. Plan accessible drains.
- Access blocked by cover — cover lifter clearance is essential for daily use.
Frequently Asked Questions
What base does a hot tub need?
Reinforced concrete 100 mm thick is standard, level to within 5 mm across the tub footprint. Paving works if sub-base is engineered for the load.
Can I put a hot tub on existing paving?
Only if the existing base meets the weight requirement. Most existing patios aren't structured for hot tub loads.
What electrical supply do I need?
Most hot tubs need a 32A or 40A RCD-protected supply, Part P certified. Confirm requirements with tub manufacturer.
How do I drain a hot tub patio?
Channel drains around the base perimeter, leading to a soakaway or piped discharge. Plan for 1,500L drains every 3 months.
Can a hot tub go on a raised deck?
Only with proper engineering — most domestic decking won't take the load. Reinforced deck structure needed.
What surround works best?
Non-slip stone or porcelain for safety; hardwood decking for warmth and look. Avoid softwood — chlorine destroys it.
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
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