How to budget for a garden room
Understand the building guide, site work and specification decisions behind a garden room quotation. A practical way to compare like for like.
Read the guide: How to budget for a garden room
A private place to slow down. Plan a dedicated sauna or a wellness room with space for changing, cooling down and a calmer daily ritual. Designed and built for your Welwyn Garden City garden by our Harpenden-based team.

Plan a Welwyn Garden City wellness room as a sequence of spaces: arrive, change, use the sauna and cool down. Keeping that sequence simple helps avoid an unnecessarily large footprint. Alongside any estate-management requirements, agree the heater supply, ventilation and privacy of the recovery area before choosing the final cladding and glazing.
Three conversations to have before settling on the size and specification of your sauna and wellness room.
Agree the number of users, heater and cabin requirements before fixing the room layout or power supply.
Ventilation, suitable materials and electrical installation need to follow the chosen equipment specification.
Consider privacy, a dry changing area and the route back to the house. Ask separately about water, drainage and cold plunge options.

This 6m x 3m garden room in Harpenden has been designed as a private retreat, with a 2–3 person sauna seamlessly integrated into the space. Combining wellness and style, it provides a calm sanctuary just steps from the home, offering year-round relaxation in a beautifully finished Cedar Space.
Project location: Harpenden. An example of our work to help plan your Welwyn Garden City project.
Explore this projectThe council says the Estate Management Scheme covers most of Welwyn Garden City and that changes to a home or garden may need consent. Check whether your address is included and discuss the scheme’s requirements alongside the planning assessment.
Welwyn Hatfield council: Estate Management SchemeYour intended use, dimensions and exact address need to be considered together. Planning permission and building regulations are separate checks.
Read our garden room planning guideFor your Welwyn Garden City sauna and wellness room, share an approximate footprint, garden photographs and any equipment or services you need. We’ll discuss the site and specification before confirming a price.
Foundations, access, glazing, finishes and services all form part of the project. Specialist equipment and any additional site work need to be specified in your quotation.
Cedar Spaces is VAT registered. Ask for a written total, VAT breakdown and a clear list of what is included.
Read the garden room cost guideYes. Welwyn Garden City is within Cedar Spaces’ published Hertfordshire and North London service area. Our team is based in Harpenden. Share your postcode and garden details so we can assess access and the scope of your project.
Yes. Cedar’s completed Harpenden project combines a garden room with a 2–3 person sauna. The cabin, changing space and any recovery area should be sized together. Cold plunge supply and installation are subject to enquiry and availability.
The council says the Estate Management Scheme covers most of Welwyn Garden City and that changes to a home or garden may need consent. Check whether your address is included and discuss the scheme’s requirements alongside the planning assessment. Ask Welwyn Hatfield Borough Council about the requirements for your specific address and proposal.
Share your postcode, intended use, approximate dimensions and access details. We then discuss the specification and site requirements. The online studio’s base guide is not a complete installed quotation; Cedar Spaces is VAT registered; ask for a written total with the VAT breakdown, inclusions and exclusions.
Yes. Our project collection includes photographs and descriptions of completed buildings, including offices and gyms in Harpenden and leisure and golf rooms in St Albans. Each example shows its actual location.
Understand the building guide, site work and specification decisions behind a garden room quotation. A practical way to compare like for like.
Read the guide: How to budget for a garden roomThe checks to make before choosing a garden building, with official planning guidance and local council resources for Hertfordshire and North London.
Read the guide: Planning your garden roomCompare a garden office, gym, golf studio, multi-purpose room and sauna. Start with how you will use the space, then choose the layout.
Read the guide: Find the right room for your gardenTell us your postcode, how you’d like to use the room and a little about your garden. Brian and the team can help shape the next step.
A few details are all we need to start the conversation.