Summary

Pond installation is a job most landscapers and general builders quote infrequently enough that they consistently under-price it — usually by underestimating the electrical scope, the filtration/UV cost on anything with fish, and the labour hours lost to spoil removal on clay or heavy soil. It's also a job where the gap between "wildlife pond with a liner" and "koi pond with bottom drain, high-flow filtration and dedicated circuit" is enormous, and quoting off a single rough day rate without breaking the job into its component costs is how margin disappears.

This guide covers pricing, not construction technique — liner sizing formulas, depth requirements by fish type, and installation sequencing are covered in detail in pond construction and water features. Use this article to build a quote once you know the build spec; use those articles to determine the spec itself.

The electrical content is the part most non-electrician contractors get wrong when pricing. Any pond with a pump, filter, UV clarifier, or lighting needs an outdoor circuit designed to BS 7671 Section 702 (the swimming pool/basin analogue used for ponds), RCD-protected, and Part P notifiable if it's a new circuit. Subcontracting this to a qualified electrician and pricing it as a distinct line item — rather than folding it into a vague "electrics allowance" — protects margin and avoids a costly redo if Building Control or an NICEIC inspection flags non-compliant work later.

Key Facts

Quick Reference Table

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Pond Type & Size Labour (Days) Materials Cost Total Price — Regional Total Price — London/SE
Wildlife pond, no fish (2-3m²) 1 £250-£500 £800-£1,400 £950-£1,800
Small ornamental/goldfish pond (4-6m²) 1-2 £500-£1,100 £1,500-£2,800 £1,800-£3,400
Mid-size fish pond with filtration (8-12m²) 2-3 £1,200-£2,400 £2,800-£5,000 £3,400-£6,200
Mid-size pond + edging/hard landscaping 3-4 £1,800-£3,500 £4,000-£7,500 £4,900-£9,200
Koi pond, basic (15-20m², bottom drain) 4-6 £2,800-£5,500 £7,000-£12,000 £8,500-£14,800
Koi pond, premium (25m²+, full filtration suite, hard landscaping) 7-10+ £5,500-£9,500 £11,000-£16,000+ £13,500-£19,500+

Materials cost includes liner, underlay, pump, filtration, UV and electrical materials (not electrician labour, priced separately below). Labour days assume a 2-person crew; electrician subcontract is additional and shown separately in the Detailed Guidance section.

Detailed Guidance

What Actually Drives the Price

Five factors move a pond quote more than any others, and each should be a distinct line in your build-up rather than folded into a single "pond installation" figure:

  1. Size and depth — directly drives excavation labour, spoil volume, and liner area (liner cost scales roughly with surface area plus depth allowance, per the sizing formula in pond construction)
  2. Fish stock intended — a wildlife pond needs no filtration; a goldfish pond needs modest filtration; a koi pond needs substantially more filtration capacity, a bottom drain, and a larger pump — this is the single biggest swing factor between "small pond" and "koi pond" pricing categories
  3. Electrical scope — any pump, filter, UV unit or lighting needs an RCD-protected, Part P notifiable circuit; price this as a distinct subcontracted line, not an allowance
  4. Access and spoil removal — a back-garden pond with poor access (no side gate wide enough for a mini-digger, long barrow run) adds labour hours that a straightforward front-garden job wouldn't incur; always walk the site before quoting
  5. Edging and hard landscaping finish — natural stone coping, decking overhangs, or a paved surround can cost as much as the pond itself; price this as its own scope, ideally cross-sold alongside patio laying or decking work if the customer wants a full garden finish

Labour Cost Breakdown

Price labour as crew-days at your actual day rate, broken into distinct phases rather than a single lump figure — this protects you if the job runs long on a phase outside your control (e.g., unexpectedly rocky ground) and makes variations easy to cost:

A groundworker/landscaper day rate of £180-£280 regional (£220-£320 London/SE) applied across these phases gives the labour total; add materials with your standard markup, then add the electrician's subcontracted price as a separate line.

Materials Cost Breakdown

Material Cost Range Notes
EPDM liner (45-60mil) £3-8/m² Standard choice for most domestic ponds
Geotextile underlay £1-2/m² Always include — false economy to omit
Pump (fish pond) £80-£250 Sized to turnover full volume every 1-2 hours
Pump (koi, high-flow) £250-£600+ Sized for 1-hour turnover minimum
Biological/pressure filter £150-£450 Fish ponds
Gravity filtration system (koi) £400-£1,200+ Larger stock, bottom-drain fed
UV clarifier £60-£200 Sized to pond volume, 15-25W typical
Electrical materials (cable, junction boxes, isolators) £80-£250 Separate from electrician's labour
Edging materials (stone/paving/decking) £40-£150+/linear m Highly variable — get a firm supplier quote before finalising the customer price

The Electrical Line: Don't Fold It In

This is the most common pricing mistake on pond jobs. Every pond with a pump, filter, UV unit or lighting needs a new or extended electrical circuit designed to BS 7671 Section 702 principles (zone classification around the water, RCD protection, appropriate IP-rated equipment) and is Part P notifiable as outdoor electrical work. Quote this as a distinct subcontracted line at £350-£750 (regionally variable, higher in London/SE) rather than a vague allowance — it protects your margin if the run is longer than expected, and it gives the customer a clear paper trail (Part P certificate) they'll need for home insurance or a future sale. Never attempt this work yourself unless you are a registered electrician — see pond construction for the full zone classification and RCD requirements.

Worked Example: Mid-Size Fish Pond with Edging

A typical quote build-up for an 8m² goldfish pond with paved edging, regional (non-London) pricing:

Subtotal: £220+£165+£165+£330+£875+£450+£220+£600(edging materials) = £3,025. Add contingency/overhead margin per your normal practice (commonly 10-15% on top of a build-up like this) to reach a final customer price in the region of £3,300-£3,500 — consistent with the £2,800-£5,000 regional range in the Quick Reference Table above.

Regional Variation

London and the South East consistently run 15-25% above regional pricing across every cost component in this guide — labour day rates, electrician subcontract cost, skip/spoil removal, and materials delivery. Where a job sits close to a category boundary (e.g., a mid-size pond that could price at either end of its bracket), London-based contractors should default toward the upper end of the regional range or apply the stated uplift directly to a regional build-up rather than guessing.

Frequently Asked Questions

Should I subcontract the electrical work or quote it myself?

Subcontract it unless you are personally a registered electrician. Pond electrics fall under BS 7671 Section 702 and are Part P notifiable — getting this wrong exposes you to liability and can invalidate the customer's home insurance. Price the electrician as a distinct line item at £350-£750 rather than folding a rough allowance into your overall figure; this protects your margin and gives you a clean audit trail if anything is queried later.

Do I need planning permission or Building Control involvement to install a pond?

Most domestic garden ponds do not require planning permission as permitted development, though very large or deep ponds, or those in conservation areas, are worth checking with the LPA — see pond construction for detail. Building Control is not normally involved in the pond structure itself, but the new electrical circuit is Part P notifiable regardless of pond size.

How should I price a koi pond differently from a standard fish pond?

Don't just scale the same per-m² rate — koi ponds require disproportionately more filtration capacity, a bottom drain, deeper excavation (900-1200mm vs 600mm), and typically a larger electrical supply. Price each of these as its own line rather than applying a flat multiplier to a smaller pond's quote; the Quick Reference Table above shows how non-linear the jump from mid-size to koi-grade pricing actually is.

What's a realistic margin to build into a pond quote?

Trade convention is cost price plus 20-35% markup on supplied materials, applied separately from your labour day rate (which should already reflect your real overhead and profit expectation). On top of the full labour-plus-materials build-up, many contractors add a further 10-15% contingency/overhead margin, particularly on jobs with variable site conditions like excavation in unknown ground. Building your quote from itemised phases (as in the Worked Example above) makes it far easier to defend your price to a customer than a single lump-sum figure.

Regulations & Standards