Thinking of converting the attic in your terraced house into a liveable loft?
Well in this blog post I’ll show you how to check if you can convert your loft as not all attic spaces can be converted.
NOTE: Don’t miss the ‘Case Study Video‘ section at the end of this post. It will show you how to take what you learn in this blog post to an entirely new level…
Loft conversions are an extremely economical way of getting a lot more space out of your Terraced House as they are one of the cheapest types of extension you can do providing your roof is suitable for one.
However it’s also worth saying now that with lofts we need to be a bit creative with how we plan them out.
Things like stairs access, headroom, drainage & utilities can be tricky.
Loft conversions are a very efficient use of space in a property and you can often convert your loft under your permitted development rights as long as you are in a standard planning area.
What that means is you don’t require full planning permission as long as you don’t exceed 10% of the overall gross floor area of your home or no more than 50m3 of volume of an extension.
You still need permission from your local council but it’s a fast track process and the council can’t object to your loft conversion.
However before you go down that road you must check that a loft conversion is possible in the first place.
I’ve outlined below a 3 step check that will not only let you know if a loft conversion is possible but also what size loft you’ll have once the work is finished.
Step 1: Roof Structure Check
You first need to check if you have a trussed roof or a cut timber roof. If your home was built pre-1960 then you most likely have a cut timber roof.
Here’s what a trussed roof looks like:
Here’s what a cut timber roof looks like:
They might look very similar but there is a big difference.
The trussed roof has been designed as one big structural system, if you remove one member then the whole frame falls apart. So to convert a trussed roof into a usable loft space usually means replacing the entire roof structure.
The cut timber roof however, has been designed using very separate members so removing one member doesn’t cause the rest of the frame to fall apart. And as a result we can move things around without having to replace the entire roof.
If you have a trussed roof then you’ll need to consult with a structural engineer as to the feasibility of modifying the roof structure to open up the space for a loft conversion.
If you have a cut timber roof then congratulations as these types of roof are far easier to modify to open up the loft space.
Step 2: Check Pitch & Span Of The Roof
With this step you need to check the angle your roof slopes otherwise known as the pitch. And you also need to check the span of your roof which is the distance between the front and rear walls of your house.
To check the pitch all you need to do is get into your roof space with a protractor (remember these from your school geometry sets?) and measure the angle of the main rafters.
Another way is to measure back 1.0m from the inside face of your front or rear wall. Then mark that point with either marker or some spray paint. You then measure from that point to the underside of the main rafters above.
You can now use that dimension with the table below, we’ll call that dimension X:
Table 1: Pitch based on vertical dimension X from a point 1m back from inside face of wall to underside of main roof rafter
These 2 dimensions will determine if you can get adequate head room and floor space in your loft.
Once you check both the pitch and the span then use this table below to see if you’ll be able to get a loft into the roof space or not:
Table 2: Possible Conversion Based on Pitch & Span
|Roof Span (m)|
Any spans greater than 9m that still have at least a 35° pitch pass this test.
Step 3: Internal Loft Dimension Check
Now that we have checked the roof structure and the overall dimensions of your roof, we now need to check if we have enough internal space in the loft.
There’s no point going to all the effort of building a loft conversion if we are going to end up with a tiny space when it’s finished!
It is obvious that we can’t maintain a constantly straight roof when it comes to the inside of your loft. The sides will be sloped to match the existing roof slope. But we do need to trim this out with some ceiling and side walls to form the space.
So as a rule of thumb we want to have 2.3m headroom in the middle of the loft which will be under the apex of your roof and we want to construct 1.0m high side walls so we can comfortably sit low furniture against them.
So that all looks like this:
We will be using the space behind these low side walls for storage or to relocate your water tank.
You can using these dimension see just how much space there will be in your loft conversion.
Ok we haven’t allowed for bigger floor joists, roof insulation and the like but this does give you a very good ball park feel for the space you’ll get from your loft.
Now that we’ve determined whether your roof space is suitable for a loft conversion there are some other things we need to take into account.
The first is the condition of the roof timbers. If they are decayed or have been on the receiving end of insect attack then they will need to be replaced.
The condition of the walls both external and internal will need to be checked if they need any repair.
The party wall with your neighbour will also need to be inspected for it’s condition.
If you have any internal load bearing walls in the floor below then these will be used to support the loft floor.
Drainage, water tanks and any other services will need to be re-routed so keep that in mind.
One more important consideration is the lintels over the top floor windows and these will need to be checked for their adequacy. This is especially important if you have to use steel beams to support the loft.
This might happen if you have no internal load bearing walls and we need to put in some beams to support the modified roof structure.
But these are things your structural engineer will help you with any way.
I’m just making you aware of them.
So there you have a simple 3 step method of checking whether your roof space is suitable for a loft conversion.
So what do you think? I’ve tried to make this blog post as un-techie as possible but if you need me to clarify anything please leave a comment below and I’ll address it.
Also if you have any other questions, requests for posts on specific topics or just liked what you read then please leave a comment below too.
However this is just the beginning and we haven’t discussed how to layout the rooms in your loft, in other words we haven’t got to the good stuff yet.
So with that said I’ve got something very special for you.
The Ultimate Terraced House Loft Conversion Information Pack
In the meantime if you would like to know how to layout your loft AND make sure that the building work goes as planned then you need to check out a our Terraced House Loft Conversion Information Pack.
This information pack has been developed over the last 16 years in designing & managing peoples loft conversion projects.
Here are some of the things that are covered:
- Step-by-step, easy to follow instructions that show you how to create a loft conversion in your terraced house
- How to AVOID BEING RIPPED OFF by builders during the work
- Several loft layouts so you can pick and choose what to do with your loft space
- Where to get some other work done to your home that will ADD A LOT TO THE VALUE of your property
- How to make sure and check that you are getting quality workmanship in your loft
- How to put a world class bathroom into your loft
And this is just a sample!
This info will give you confidence when you deal with builders so you’re not taken for a fool or even worse ripped off.
So to find out more all you have to do is click the link below: