Case Study: Indoor Swimming Pool + Spa Suite (Wetherby, LS22)

At a large detached home in Wetherby (LS22), the brief was clear: create a private, year-round wellness space without compromising the look and feel of the property above ground. We delivered the shell & core build for a brand-new indoor swimming pool, spa zone and dedicated changing suite-starting from a blank area and progressing through surveys, excavation, reinforced concrete structure, and a BS 8102:2022-aligned waterproofing strategy designed by a named CSSW specialist. With the household live throughout, the project demanded calm, neighbour-ready logistics, tight control of penetrations and tolerances for specialist pool plant, and a robust “pool-ready container” that could be handed over cleanly for the specialist systems and finishes.

Who this case study is for

  • Homeowners: what the build involved, how disruption was managed, and how we protected the existing home and garden.
  • Professionals: key structural/waterproofing considerations, temporary works methodology, interfaces with MEP and pool specialists, and documentation for approvals.
Wetherby indoor swimming pool build excavation set-out at large detached home
Pool-ready shell and core structure handed over for specialist pool systems Wetherby detached home

Project snapshot

Item Detail Why it mattered
Location Wetherby, LS22 (North East Leeds area) Affluent residential setting; careful delivery planning, noise control and tidy site management.
Property type Large detached home (live household throughout) Protection of existing structure, secure access routes, and phased works to minimise disruption.
Scope (our role) Shell & core structure + waterproofing strategy coordination + builders’ work for MEP interfaces We delivered the robust “container” for the specialist pool/spa fit-out team to complete.
New build elements Pool hall, spa zone, plant/filtration area, changing suite + circulation Moisture, heat, and plant loads demanded careful detailing and access planning.
Representative pool size Approx. 10–12m x 4m (variable depth) Structural spans, water loads, and plant sizing all scale quickly with pool volume.
Key constraints Ground conditions + potential groundwater considerations; residential access Influenced temporary works, waterproofing approach, and programme sequencing.
Site clearance and access preparation for Wetherby indoor pool and spa construction
Reinforced concrete wall construction for pool hall structure at detached property Wetherby
Reinforced concrete base slab pour for indoor swimming pool and spa suite Wetherby
Waterbar and construction joint detailing for BS 8102 waterproofing readiness Wetherby pool build
Reduced level excavation for pool hall foundations in Wetherby LS22
Temporary works support and safe excavation for indoor pool structure in Wetherby

The brief

Homeowner priorities

  • Year-round wellness with an indoor pool, a spa area for recovery, and a dedicated changing zone.
  • Discretion and comfort: a calm, private facility that doesn’t dominate the home externally.
  • Minimal disruption: family life continuing on-site with safe segregation of works.
  • Long-term confidence: a waterproofed, durable structure that won’t become a maintenance headache.

Professional requirements

  • Clear responsibility split: shell & core delivered to defined tolerances; specialist pool contractor interfaces pre-coordinated.
  • Waterproofing strategy: designed to BS 8102:2022 principles by a named CSSW specialist.
  • Temporary works governance: procedures aligned to BS 5975-1:2024 with appointed TWC/TWS.
  • Neighbour-ready documentation: logistics, working hours, protection measures and considerate construction controls.
Waterproofing membrane installation to reinforced concrete pool structure in Wetherby
Steel connections and bracing installed on Wetherby indoor swimming pool and spa build
Plant room slab and formed service penetrations for pool filtration system Wetherby
Coordinated builders work openings for ventilation and dehumidification to pool hall Wetherby
Changing area structural partitions formed within indoor pool and spa suite Wetherby LS22
Reinforced concrete beams and structural openings formed for pool hall circulation Wetherby

Site context in Wetherby

Wetherby is a well-connected market town in the City of Leeds area, positioned on the River Wharfe and close to major transport links — ideal for deliveries, but still a sensitive residential environment where neighbours, schools, and local traffic patterns influence how you run a project.

The site sat within an established detached-home setting, so we planned for: tight access control, clean haul routes, low-noise sequencing, and “no-surprises” neighbour communication.

Pool building envelope sheathing installation to steel frame structure in Wetherby
External slab and access works formed for indoor pool and spa building in Wetherby
Service trench and routes for pool plant and drainage coordination on Wetherby project
Overall progress view of indoor swimming pool and spa suite shell build in Wetherby LS22

Technical overview (shell & core)

Structure & excavation

The pool environment imposes significant permanent loads (water mass, retained ground, and plant zones). We delivered a reinforced concrete structural solution with careful joint detailing, robust tolerances, and builders’ work provisions to support the specialist pool package.

Waterproofing & moisture resilience

Pool halls are moisture-intensive spaces. We coordinated a BS 8102-aligned waterproofing approach with clear interface rules (penetrations, upstands, joints, and service zones) so the final pool/spa contractor could install finishes and systems onto a stable, dry substrate.

MEP / plant readiness

We planned early for filtration, heat source, ventilation/dehumidification, drainage runs, and safe maintenance access. That meant builders’ openings, sleeves, plinth zones and plant-room access were formed correctly — reducing late-stage rework.

Neighbour management

Residential projects succeed on “how” as much as “what”. We implemented delivery slots, dust/noise controls, tidy perimeter management and proactive updates — keeping the build calm, predictable and respectful.

Drainage and sump provision for groundwater management on Wetherby indoor pool build

Our process (from blank space to pool-ready shell)

1) Surveys, investigations & coordination

We began by validating the structural concept and buildability: measured surveys, ground/soakaway observations, drainage mapping, and early coordination with the pool and MEP specialists. The goal was simple: lock down penetrations, plant locations, and access needs before concrete was poured.

2) Enabling works & logistics set-up

With a live household, we established safe segregation and clean routes. Materials were sequenced to reduce street impact, with considerate working controls and neighbour-first site etiquette.

3) Excavation & temporary works

Excavation was managed under formal temporary works procedures, with designed support where needed. Monitoring points and sign-off stages ensured the excavation remained stable and the surrounding areas were protected.

4) Base slab, retaining structure & pool tank formation

We formed the structural base and walls to the agreed tolerances, with movement-joint strategy and builders’ work sleeves carefully set out. In pool projects, “later” fixes are expensive — so we treat set-out and penetration control as critical path items.

5) Waterproofing strategy implementation (BS 8102-aligned)

Waterproofing in a pool/spa environment is not a single product — it’s a system with strict rules: junctions, upstands, service entries, and maintainable details. We coordinated the design intent and built the shell to receive the chosen system, protecting integrity at every interface.

6) Plant room readiness & service coordination

We formed access, drainage falls, plinth zones, and opening sizes to match the pool plant schedule. That included practical maintenance clearances (filters, pumps, dosing, heat interface, and ventilation/dehumidification).

7) Shell completion, QA & handover to specialists

Before specialist pool/spa works commenced, we completed structured QA checks, as-built records and interface sign-offs. This ensures the finishing teams are installing onto a verified shell — not troubleshooting hidden defects.

Outcome

For the homeowner

  • A discreet, high-end wellness space planned around everyday family life.
  • Clear programme stages and predictable site behaviour (clean, quiet, controlled).
  • Confidence that the structure and waterproofing strategy were designed and coordinated properly from day one.

For the professional team

  • Defined shell & core responsibilities and clean handover to pool/MEP specialists.
  • Penetrations, plant access and service zones coordinated early to avoid late-stage clashes.
  • Temporary works and QA approach aligned to recognised good practice and documented sign-off stages.
Wetherby indoor swimming pool build excavation set-out at large detached home
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questions/answers

Wetherby Indoor Pool & Spa — FAQs

Programmes vary based on excavation complexity, structure, and waterproofing approach. The key is defining hold points (set-out, penetrations, joints, and waterproofing readiness) and coordinating early with pool/MEP specialists so the shell is delivered “pool-ready”.

Yes — but it must be designed to manage settlement, structural interfaces, and moisture. We plan excavation support, sequencing, and structural junction detailing to protect the existing building and reduce the risk of movement-related cracking.

Condensation is managed through the ventilation/dehumidification strategy and correct envelope detailing. From a shell perspective, we ensure penetrations and junctions are formed correctly and that the structure is ready for the specified systems (duct routes, plant access, drainage interfaces and maintainable details).

Often, yes. Excavations can be deep, close to structures, and sensitive to groundwater. Temporary works design and governance (TWC/TWS procedures) protect people, property and programme — and prevent avoidable risk.

We pull key data forward: plant room layout, sleeves/penetrations, access clearances, and junction details. That information is locked in early so the shell progresses smoothly and the specialist team inherits a properly prepared structure.

Planning an indoor pool or spa suite in Wetherby or the wider North?

If you’re exploring a high-end indoor pool, spa or wellness build, we can advise on structural approach, waterproofing strategy, temporary works, logistics and shell delivery — and coordinate cleanly with your architect, engineer and specialist pool contractor.

Discuss your project
Or call 0784 135 2195 / email info@basementstructuresnorth.co.uk