What is the cost of a loft conversion in London?

What is the cost of a loft conversion in London?


Loft Conversion Costs



“How much will it cost?” this is an obvious question you have in mind when considering converting your roof into loft space.

Loft conversion is an ideal way to add value to your property, especially in areas where space is at a premium. Research shows that a loft conversion can add up to 20% to the value of your home. It’s great news! Think about it:

o  Let’s say the house is worth £300,000.

o  The loft conversion cost is £28,000.

o  After you converted the loft the house valuation came up at  £360,000

o  As a result you have more space in your house and £32,000 PROFIT.

Loft conversion prices vary because each loft conversion is very different due to the differences in each house and each loft. However, we can provide a rough guide to give you an idea of loft conversion prices.

Our Loft Conversions prices in London are very competitive, below is a guide to the loft conversion prices you could expect to pay:

Guide of Loft Conversion Prices


  • Small Loft Conversion: New floor joists, steel beams to hold the weight of the floor, 2 Velux windows, lights, and sockets. Loft stairs, fully insulated, plaster-boarded and plastered, power points (small bedroom.) £17 – £20,000.

  • Medium Loft Conversion New floor joists, steel beams to hold the weight of the floor, 1 RidgeSteel Beam to hold the weight of the dormer, 1 bathroom, dormer windows, 2 Velux windows, lights, and power points, 2 radiators and loft stairs. £23,000 – £28,000

  • Large Loft Conversion New floor joists, steel beams to hold the weight of the floor, 1 RidgeSteel Beam to hold the weight of the dormer, dormer, ensuite Bathroom, windows, 2 Velux windows, lights, and power points, 2 small radiators, Loft stairs From £29,000.

Oh but there is VAT on top….


There is nothing more irritating than for a builder to say, “Of course there is VAT on top of that” after you agreed the price. Suddenly a figure that seemed reasonable goes through the roof.

Unfortunately, VAT is something we all have to deal with and calculating the level of VAT on loft conversions, is more confusing than in any other area.

Some important facts about VAT

  • Building work classified as maintenance or conversion is chargeable at the full rate of VAT;

  • VAT on loft conversions in flats is only chargeable at 5% which a far more satisfying;

  • There are no VAT charges on new builds;

  • There are no VAT charges on Conversions to listed buildings, if allowed by the planning department;

  • Different rates of VAT will apply for a loft conversion in a property that you have just acquired if it has been empty previously;

  • For the property that has been empty for ten years there is no VAT, if the house has been empty for more than three but less than ten years. The VAT will be 5%.

So What Can You Do?



We are not suggesting anything illegal here but there are some ways to reduce VAT (for example by using contractors for the jobs such as electrician and pluming).

Builders are very good at changing the subject when VAT is mentioned but, for your good, it is crucial that the situation is clarified, in writing, before any work is done.

Failure to take VAT into consideration will have a severe impact on your budget so make sure it is sorted out at the very start so you don’t get a nasty surprise when it comes to final amount that you are charged.

Get a quote with no hidden costs from the area’s favourite loft conversion company, LLAC – London Lofts and Construction, now. Fill the quotation form  or give us a call on 0800 228 9160.

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