Basement Conversions

Do They Add Value?

Introduction

If you have run out of space but do not really want to move then a basement conversion may be the answer. Here is some information that we hope will help you decide whether a basement conversion is for you.

If this is all too much for you we would be more than happy to help. We would be more than happy to comment on this when we carry out a survey. Please telephone for help and advice on basement conversions 0800 298 5434 and a Chartered Surveyor will phone you back.

Can I Carry Out A Basement Conversion?

Some considerations when carrying out a basement conversion are: Is the existing basement damp? Does it have suitable head height? Whilst alterations and movements can be made, for example, to give you enough head height by lowering the ground level, as you can imagine it is painstaking, labour intensive and therefore often an expensive job.

Does It Require Planning Permission For A Basement Conversion?

Typically, no permissions are required from the Local Authority. However, do check if the property is Listed or in a Conservation Area or whether structural work, such as moving walls, is required, as this will then require either Planning Permission and/or Building Regulations (we would always recommend that you check with the Local Authority just to see if there are any improvements needed and you also may get some very useful information from them with regards to the local area and the water table level).

What Does A Basement Conversion Involve?

Normally the usual options are either to tank the cellar, which is the traditional method, or to dry line the walls. For either option you really require builders that are used to this type of work, or to be very experienced at D.I.Y.

What Do The Builders Do?

There are commonly two systems in use; one known as tanking and the other known as the dry lined drainage system.

Tanking

This is where the basement is lined to stop water getting in. Ideally it should be lined on the inside but this is difficult where it is an existing basement and often it is lined on the inside. It should include the floor area. This can unfortunately lead to a build up of pressures and cause damage and deterioration if not carried out properly.

Dry Lined Drainage System

This is where the basement is drained of any dampness within it behind false walls into a sump pump, which is a pump located at a lower level within the floor of the cellar.

A Basement Conversion – Your Design Choices

There are few choices with a basement conversion, such as:

•  Light - do you wish to add windows to give natural light into the basement?

•  Ventilation – do you wish to add a mechanical ventilation system, or even a real air conditioning system (this is one where the heating, the cooling and the relative humidity is controlled by air ventilation, but these are expensive. The term air conditioning is used when air handling is occurring).

•  Sump pumps – there is a range of sump pumps available, including those with alarms in case the sump pump doesn't cope or fails for some reason and also there are those with back up sump pumps.

Brief Specification of the Works Carried Out for a Basement Conversion by the Builders

Tanking System :-

 

•  Removal of all items within the basement.

•  Preparation of basement

•  Adding a sump pump (if so required)

•  Possibly replacing the floor if it is not considered suitable.

•  Applying first coat to the wall

•  Applying second and third coats to the wall

•  Tanking the floor area

•  Adding appropriate falls onto any water that does get into the basement towards the sump pump.

Dry Lining Drainage System :-

•  Clearing of cellar

•  Checking of floor timbers and protecting as required

•  Preparation of walls

•  Adding a drainage channel

•  Adding sump pump

•  Applying fixing plugs

•  Applying plastic sheeting to walls

•  Adding dry lining

•  Adding a fall to the floor to stop any water.

Getting On With Your Builder

It is very important to build a good relationship with the builder carrying out the basement conversion. We feel fundamental to this is a detailed agreed quotation for the work, together with discussions on any possible extra items that may come to light. Agreement on when payments will be made, for example within two weeks of the work being completed, possibly an official contract, although some smaller builders tend to be put off by this. Set and agree the site rules, i.e. what time work can begin and whether you are happy for the builder to work at the weekend and provide lots of cups of tea and bacon sandwiches, assuming your builder is not a vegetarian!

We would add that the role of project managing the building work is often under estimated and certainly there is a builder inside of you that is trying to get out! Where there are many trades it does require much co-ordination and cajoling from the builder to co-ordinate everyone. It is also important that if things are going wrong you deal with them in a logical and rational manner and if things go extremely wrong and you get into a dispute situation where the builder, for example, walks off site.

We would be more than happy to help; please contact 0800 298 5434 for help and advice with regard to basement conversions.

See our other articles on adding value to your home:

Loft Conversions - do they add value?

What is my Home Worth?

Adding Value to Your Property

We would be more than happy to help, please contact 0800 298 5424 for help with your loft conversion and a Chartered Surveyor will phone you back.