First Fix and Second Fix Plumbing Explained

If you are having a house built from scratch, you’re embarking on a true adventure and will no doubt be excited about creating the home of your dreams. Whether it’s a private build or part of a development that you’re contributing to or managing, there will be a lot to work out and plan to ensure everything runs as smoothly and on time as possible.

Different trades are involved in the building of a new home, and from the bricks to the pipework to the electrics, there’s a lot to consider when making a house a home.

Builds have to happen in stages, and part of this is the first fix and second fix. You may have heard the terms, but what do they actually mean? In terms of the plumbing for a new build home, we have the answers below. In the following guide, we answer your possible wonderings and explain in simple terms what’s involved in first and second fix plumbing.

If you’d like to discuss support for your new build project or have any questions about our service after reading this, we welcome calls or emails from customers old or new. You can contact us online, call 01924 734530 or 07900 417080 or email

First fix plumbing

First fix plumbing is a lot like it sounds, essentially it involves all of the plumbing work that needs to take place before and as the house is being built. Some plumbing work is very difficult to do after the build has taken place, and could be the cause of major disruption or even mean some of the other new elements of the build that have been completed, have to be redone. As nobody wants this, it’s important to plan in the first fix accordingly.

The first plumbing fix includes:

  • All of the pipework for the water supply for the house, including underground pipe work.

  • The pipework for waste water drainage.

  • Pipes that need to go behind the walls before they are finished and plastered, such as some bathroom pipes.

It’s important to book in different trades accordingly, giving each time and space to do their work separately. For example, some pipework can’t be carried out when an electrician is doing certain installations, so to avoid delays it’s crucial to carefully plan your timescales.

Second Fix Plumbing

Once first fix plumbing has been completed, your engineer will leave your property to allow other important work to take place and for the actual build to be finished. Once it has been, they will return to begin second fix plumbing. Now that the full structure of the house is up and the walls in, the internal and connecting work can begin.

The work involved in second fix plumbing is one of the major contributors to making a new build habitable, bringing the essential comforts that make a house a home.

Second fix includes:

  • Fitting the boiler, radiators and hot water cylinder if using.

  • Fitting the bathroom.

  • Fitting the kitchen sink and kitchen appliances.

  • Connecting the pipework to any appliances, taps or other water sources.

  • Checking and testing all of the plumbing.

Why choose Smart Gas Plumbing & Heating?

Building a house is a big undertaking, and we can help ensure it’s done right. Plumbing is one of the key elements in a well-run home, and whether your new built is being constructed for you to live in or to sell, you’ll need to ensure the plumbing is tip top and up to scratch.

The team at Smart Gas Plumbing & Heating are experienced as plumbers and heating engineers: qualified, hard working and primed to deliver to the highest standard every time. We’re also:

Professional and reliable.

A local Yorkshire business, serving Heckmondwike, Batley, Cleckheaton, Dewsbury & Mirfield.

Gas Safe registered - proving our qualifications, experience and in-depth knowledge of gas central heating systems and all gas appliances. 

Recommended and reviewed, with a ton of excellent customer reviews on our website, for potential clients to view.

The team to call for first fix and second fix plumbing in West Yorkshire

We’re always happy to answer enquiries, so if you’d like to find out more about how we can help make your new build dream a reality, simply get in touch. We’d be only too happy to meet or visit your site to talk through your requirements and how we can help your build run smoothly and on time.

We work across Heckmondwike, Batley, Cleckheaton, Dewsbury and Mirfield, offering a professional, highly skilled service every time.  To find out more or arrange a quote for our first and second fix service, don’t hesitate to contact us. You can call us on 01924 734530 or 07900 417080, email us at or send us a message via our online contact form.