Why bathroom construction should be moved offsite

In this article, James Stephens, Managing Director of the UK’s leading bathroom pod manufacturer Offsite Solutions, looks at why more developers are moving bathroom construction offsite.

There is now unprecedented demand for bathroom pods – for high end apartment schemes, mixed-use developments, social housing and build-to-rent. This shift towards offsite is driven by the shortage of skilled labour, particularly in the South East; issues with consistent quality, and the construction industry’s poor record of on time and on budget delivery. The publication of reports such as the Farmer Review and the Government’s Construction 2025 strategy have both highlighted the need to move more work offsite.

Here we look at some of the reasons why more developers are specifying bathroom pods.

Reduced Build Programmes

One of the key drivers for bathroom pod procurement is to reduce programme. By moving bathroom construction into a controlled factory environment, the programme saving on a large residential project can be as much as 20 weeks. This means a faster return on investment for the developer or earlier occupation for the client – and much greater certainty of completion on time and to budget.

Site-built bathrooms can take 6-12 weeks to complete requiring multiple trades and extensive site management. Typically, 10 GRP pods or 6-8 steel-framed pods can be offloaded on site in two hours for rapid installation.

Improved Cost Efficiency

The use of bathroom pods allows a number of trades to be combined under one contract, reducing risk. This simplifies cost management and cash flow forecasting as the cost of factory works are more predictable and stable than site-based labour and multiple subcontractors.

Labour rates, particularly in the London region, are growing disproportionately to the rest of the UK. Outsourcing bathroom construction to an offsite specialist can realise cost savings.

With in-situ bathrooms, all subcontractors will apply for payment independently and while there may be a fixed price, costs are more difficult to predict at the early stages of a project, increasing risk for the contractor or developer.

Cost variations can arise where additional labour and materials are required to rectify poor construction work. Snagging and remedial works are hugely reduced when bathroom construction is carried out offsite.

There is less risk of theft and accidental damage with bathroom pods. For example, the units can be delivered without shower hoses or light bulbs – the two items most frequently stolen from site. These can then be supplied with the last pod delivery to minimise exposure time.

Simplified Procurement

Site-based bathroom construction requires around seven different trades and 10-15 operations plus the required drying times. With offsite manufacture, this is reduced to a single pod supplier, which means less risk of delays and simplified procurement.

Superior Quality Control

The production line environment of pod manufacture offers consistently higher quality, and improved productivity. The repetitious nature of bathroom pod production means that the units can be completed to higher quality standards than on site.

Pre-delivery testing is rigorous and quality assurance procedures are stringent for ready-to-use installation, mitigating defects and remedial works.

Reduced Waste

Bathroom pod manufacture uses lean production techniques and better management of materials. Efficient processes optimise the use of resources and waste can be designed out. These factors combine to help to reduce waste in the factory to below 1 per cent.

Safer work on site

Site safety is a huge issue for contractors. Moving construction offsite into a safer factory environment is a key benefit and research has shown that preassembly significantly reduces accident rates.

A good pod manufacturer will design the pods for fast installation on site, using for example, mechanically-fitted pan connectors and pre-wired junction boxes to simplify electrics.

Connections to services are made externally so access should be allowed for as part of the pod installation and building designers must consider pod installation in the build-up of walls and floors.

Design Flexibility

There have been significant advances in bathroom pod technology and there is now a wide range of solutions for different building types and site challenges:

  • Steel-framed pods – a premium aesthetic with tiled finishes and a high level of design flexibility. Applications include large-scale apartments, higher specification student residences and build-to-rent
  • GRP pods – widely used for student accommodation and social housing. Lower capital expenditure and low maintenance.
  • Hybrid concrete/steel pods – a concrete base and steel-framed walls for high specification apartments
  • Demountable pods – a sectional structure for projects without access for fully assembled pods, such as refurbishments and commercial-to-residential conversions
  • Hybrid GRP pods – an enhanced finish and improved aesthetics with ceramic tiling and recesses. Applications include build-to-rent
  • Floorless pods – where a continuous floor finish is required throughout or for DDA compliance for floors with no threshold.

Building bathrooms on site can be inefficient and too often causes issues with delays, health and safety management, and poor workmanship which impacts on quality and defects.

In contrast, factory-built bathrooms are delivered to site ready for installation, providing a consistent quality of finish that is unachievable on site. Cutting-edge manufacturing technology and quality-controlled production ensures each pod is delivered to site as a complete, fully tested unit – and this is revolutionising the efficiency of bathroom construction.