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Loft Conversions

How long will a loft conversion take?

On average how long will a loft conversion take to complete?

17 Answers from MyBuilder Loft Conversion Specialists

Best Answer

dormer loft conversion with bathroom and 2 bedrooms takes 6 / 8 weeks from start to finish


Answered 18th Feb 2011

No one can honestly answer with out knowing the consruction, steel works, what type of windows, dormers, velux.
Taking into account plumbing, electrics, plastering, stairs etc, it would be more than 2/3 weeks


Answered 17th Feb 2011

those who have comented 2 /3 weeks are either cowboys or chancers, to do afull loft conversion under building regs , were you have to change every door and frame (exept wetrooms), maybe change lintls to satisfy load demands, an average loft will take between 6 to 10 weeks , anyone who says less proberly have never done a full loft under building control


Answered 22nd Feb 2011

UK Management Builders can complete a typical loft conversion in FOUR weeks or less. This applies to a three bed semi: inculding a two/three tier staircase,velux windows and flooring with beams/Steel Rsj and good plaster/skim finish. We always show examples of our work to customers.

All firms are different in terms of how they work and some take longer...sometimes much much longer.

Always ask to see examples of work so you know what type of quality finish to expect for the prices you maybe getting.

Basically, It all boils down to man power, more chaps on job the quicker they finish... so to answer the question nobody really knows how long a loft conversion will take....we all know they should take 4-8 weeks max, but problems can occur which can delay the job; weather, finance, people not turning up to work, design issues (leaks/load bearing stresses), you may even discover damage to property which was "hidden" until one started converting the loft etc.

I hope the above helps and you have a happy conversion experience.


UK Management Builders LTD

Peace of mind builders


Answered 18th Feb 2011

The average dormer style loft conversion takes approximately 4 to 5 weeks to construct from start to completion.
Hope this helps!

Kind regards,


Answered 17th Feb 2011

There are so many contributing factors to a loft conversion that it is very difficult to give an accurate timescale. For those that have stated 3 weeks must have a large workforce on a relatively small conversion.
In my experience they can take between 5 - 12 weeks.


Answered 20th Feb 2011

Hi there 2/3 weeks no way you are looking at 6/8 week to get it to a high Standard


Answered 26th Feb 2011

We regularly do loft conversions to building control and never take over 4 weeks these people who say 10 weeks hello feeling guilty for outrages quote you gave either that or sack your lads and get qualified tradesmen


Answered 2nd Mar 2011

normally to complete a loft conversation take max.6weeks.


Answered 18th Feb 2011

I would say that most loft conversions should be complete in approx 2/3 weeks although there are many varying factors.


Answered 17th Feb 2011

Basic loft conversion should take no more than 2 - 3 weeks


Answered 17th Feb 2011

To build a loft conversion of 50m3 size on a good spec with new roof coverings and en suit bathroom should take between 6-8 weeks thats for a nice finish


Answered 19th Apr 2012

4-6 weeks actual build time, depending on size etc.


Answered 12th Mar 2011

2 months start to finish for a high spec conversion.
2 - 3 weeks for a square flat top box on top of your roof. Nasty nasty.....
In other words 2 - 3 weeks estimate is total rubbish!!


Answered 3rd Jul 2011

A loft conversion should take on average 4 weeks. Thats what we work towards. There are many contributing factors of course - size, steels, access, weather! But most good builders should be able to completet start to finish (including snagging) in 4 weeks.
CAL Builders


Answered 31st Oct 2011

Ave 5/6 weeks


Answered 23rd Apr 2012

3 weeks


Answered 4th Jun 2023

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