Garden Office Buyer's Guide

A room at the bottom of the garden is one of the simplest ways to separate work from home life. This guide covers what makes a garden office comfortable all year and how the main types of building compare.

Start with how you'll use it

Before you look at models, write down how you'll actually use the space. The answers decide almost everything else.

• How often? A few afternoons in summer is very different from five days a week in January.
• How many people? A single desk needs far less room than a desk plus a sofa or a meeting table.
• What equipment? Monitors, a printer, a video-call setup or a kettle all need sockets and a reliable connection.
• Will anyone visit? If clients or staff will come to your garden office regularly, ask your council whether that changes anything for your property.

As a rough guide, a single desk and chair with storage fits comfortably in around 2.5m × 2m. If you want a second seat, a sofa or room to pace during calls, look at 3m × 2.5m or larger. Our sizing guide goes into more detail.

Insulation: the difference between a summerhouse and an office

Insulation is the single most important thing in a year-round garden office. Without it, the room will be cold in winter, hot in summer and prone to condensation, and heating it will cost more than it should.

Look for insulation in all three places: walls, floor and roof. Heat rises, so an uninsulated roof loses a lot of warmth, and a cold floor makes a room feel chilly even when the air is warm. A breathable membrane behind the cladding helps keep moisture out of the insulation.

When comparing buildings, ask what the insulation is, how thick it is and where it goes. A lower W/mK figure means the material insulates better.

Glazing and doors

Natural light makes a garden office a pleasant place to work, but glass loses more heat than an insulated wall. Double glazing is the minimum for year-round use. Toughened safety glass is worth having in doors and low windows.

Think about where the sun will be during working hours: a big south-facing window can overheat the room and cause screen glare. Opening windows help with fresh air, and good locks matter if you'll leave a computer out there.

Electrics and internet

Power to a garden office should always be installed by a qualified, registered electrician. In England, electrical work in and around the home falls under Part P of the Building Regulations, and running a new circuit out to a garden building is normally notifiable work. A registered electrician who belongs to a government-authorised competent person scheme can self-certify the work and give you a certificate. See the Planning Portal's guide to Approved Document P (electrical safety) for the official detail.

Plan the electrics before the building goes up: tell your electrician where your desk will go, how many sockets you need, what heating you'll use and whether you want outside lighting.

Internet: house Wi-Fi often struggles to reach the end of the garden. The most reliable fix is a data cable laid alongside the power cable while the trench is open. Mesh Wi-Fi can work too.

Heating and ventilation

In a well-insulated garden office, a small electric heater such as a panel heater or oil-filled radiator is usually enough. Ventilation matters just as much: in a small, sealed room, moisture from breathing condenses on cold glass. Open a window or vent for a few minutes each day.

Timber frame, SIPs or log cabin?

These are the three main ways garden offices are built. Each can make a good workspace; they differ in how the insulation is handled and how much work is left for you.

Insulated timber-frame garden rooms

A timber frame is clad on the outside, filled with insulation and lined on the inside, much like a small timber-framed house. Our Vista Collection garden rooms are built this way: fully insulated, double glazed and designed for year-round use, with a 10-year warranty. Some models come with electrics and heating included, so check each product page for the exact specification. Vista rooms are installed for you, subject to a site survey to confirm your base and electrical connection. Read more in our Sovereign buying guide.

SIPs (structural insulated panels)

SIPs are panels with insulation bonded between two structural boards. The panels are the structure and the insulation at the same time, which makes a SIPs building very airtight. PentHaus garden offices are designed to your own size and layout using PentHaus's online tool. They include composite cladding. Only the SignatureSIPs option is SIPs-built, and built-in channels for wiring come with SignatureSIPs only; PentHaus also offers two timber-frame options: ToughFrame PRO, with rigid PIR insulation in the walls, floor and roof, and ToughFrame, a shell with weather-tight cladding but no insulation or internal linings. See our PentHaus buying guide.

Log cabins

A log cabin is made from solid interlocking timber logs. The log cabins we sell use 44mm logs, which are sturdy and have plenty of character. Models such as the Power Apex Retreat and Deluxe Retreat come with double toughened glazing, uPVC doors and windows and an EPDM rubber roof, and are delivered free to your kerbside as a self-assembly kit. A solid log wall is not the same as an insulated wall, so for full-time office use most people add insulation to the floor and roof at least. Our log cabin wall thickness guide explains more.

Whichever you choose, a garden office needs a solid, level base, usually concrete. See choosing and preparing a base.

Planning permission and building regulations

Most garden offices in England are "permitted development" if they're single storey, used for purposes incidental to the house, and meet the height and position rules. The key one for a garden office is the 2.5 metre height limit within 2 metres of a boundary. Several of the garden offices we sell, including the Power Apex Retreat log cabins and most PentHaus designs, are under 2.5m high. Always check the overall height on the product page, and remember a raised base adds to it.

Building regulations approval is not normally needed for a detached building under 15m² with no sleeping accommodation, or between 15m² and 30m² if it's at least 1 metre from any boundary or built substantially of non-combustible materials (Planning Portal). Electrical work still has to meet Part P. For the full picture, read our planning permission guide.

Common questions

Can I use a garden office all year round?

Yes, if it is properly insulated in the walls, floor and roof, double glazed and heated. An uninsulated summerhouse or log cabin will be uncomfortable in winter unless you add insulation.

Do I need planning permission for a garden office?

Usually not in England, if it's single storey, used as an office for the household and within the permitted development limits, including a 2.5m maximum height within 2m of a boundary. Listed buildings, designated land and properties with removed rights are different. Check with your council if unsure.

Who can install electrics in a garden office?

Use a qualified electrician registered with a competent person scheme. A new circuit to a garden building is normally notifiable under Part P in England, and a registered electrician can self-certify the work.

What is the difference between SIPs and a log cabin?

SIPs are insulated panels that form the structure and insulation in one, so the building is warm and airtight from the start. A log cabin is built from solid timber logs, which look great and are sturdy, but usually need extra insulation for comfortable year-round office use.

This guide is general information, not legal or professional advice. Always check planning and building regulations with your local council, and have electrical work carried out by a registered electrician.