Setting a budget for your garden room project

It’s important to set a budget for your garden room project early on. This will help you decide on the combination of space and design features that work best for you.

It’s actually really useful for a garden room supplier if the client has a clear budget in mind, as it allows them to focus on the best ways to achieve the customer’s wish list.

Some buyers tell us that they are fearful of telling a supplier their budget as they will try and make them increase it. No reputable supplier is going to do this. They may highlight that an extra ‘x’ pounds would buy you ‘x’ feature on your wishlist, but this is more from the point of view of allowing you to make an informed choice rather than them gaining a bigger sale.

As well as the building your need to budget for

Suppliers are very good at quoting prices for different size garden rooms, so you will quickly realise that an ‘x’ metre by ‘x’ metre garden room will cost ‘x’ thousand. You should remember that these prices aren’t the total project cost, as there are several other elements you need to budget for.

Here is our list of elements you need to consider in your budgeting:

Planning Permission

In many cases, a garden room can be built without the need for full Planning Permission. It is important that you check your individual situation. If you do need to apply for Planning Permission for your  building you can either handle this yourself or ask your supplier to do so on your behalf. In most  situations the supplier will handle the application as a complimentary service, although we have heard that some suppliers ask for payment to generate the plans and drawings needed. You will normally be expected to pay the Planning Permission fee. Our local authority is currently charging £172, but your local authority will have fees listed on their website.

Building Regulations

In many instances a garden room can be built without applying for Building Regulations – your electrical system must comply with Building Regulations though. If you are building a large garden room or a room that you plan to sleep in, then you will need to consider Building Regulation fees when budgeting. It’s difficult to estimate these as they depend on the cost of the project and the work being undertaken. This is certainly something you should talk over with your supplier – they may incorporate these costs into their quote or ask you to pay for them separately.

Site Clearance

Suppliers who offer a ‘turnkey service’ will normally include the clearance of the site into their project cost. When we say site clearance we mean the removal of vegetation from the site prior to work starting. This may include trimming of overhanging trees etc.

If this isn’t included in the price of your project you will need to organise it before work starts. Think about the costs of hiring someone to do this and any costs of removing the waste. If you are preparing the site yourself you may need to hire tools or a skip for the waste.


Most garden room designs come complete with the foundation system these days, but we are aware that some suppliers still ask customers to organise the installation of a concrete slab prior to them arriving on site. These suppliers normally give you details of the size and specification for the foundation system for you to organise with a local builder. How much you should budget for this will depend on the size and shape of the foundation and how level the site is. You should allow anything from high hundred pounds to over a thousand.

Electrical Hook-up

Garden rooms come pre-wired with all the electrics, but in many cases the cost of connecting the  electrics to the mains supply in your house is down to you. This is because suppliers dont often send a qualified electrician to site and the electrics must be connected by a qualified electrician to comply with Building Regulations.

There is a fair amount of work involved in this job. An armoured cable needs to be buried in a trench from the garden room to the house. Some suppliers attach the armoured cable to a fence or wall which would reduce the cost a bit. The further the garden room is from the house, the more expensive it will be. The electrician will connect this cable to your main fuse board and may have to do work on the system to accommodate the new circuit. They will also thoroughly test the system and earth the garden room.

Your supplier will be able to give you a rough idea of cost for this work, but we would estimate it costing between the high hundreds and a thousand pounds or so.

Insurance Backed Warranty

Hopefully you will have long and trouble free service from your garden room, but it’s always good to have a backup plan. Many suppliers offer warranties on their buildings for 5 or 10 years. Some suppliers go one step further and offer insurance backed warranties. These offer additional peace of mind in the event of a problem, as any problems will be sorted even if the supplier is no longer trading. Some  suppliers offer this policy as part of the overall project cost. Others ask you to pay the premium for the policy which will be relative to the cost and specification of the building.


As well as budgeting for the actual building, it’s a good idea to also have a budget for furniture etc. Most garden rooms are decorated as part of the package costs. They also come with a final floor covering, so it’s just a question of budgeting for the furniture you want to include.

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