Loft conversions · Cardiff and the Vale

There is a room above your ceiling.

Choose how you would get to it, measure from joist to ridge and see if it fits. Then Dai comes up with a tape, for nothing, and tells you straight.

Free surveyWith a tape, and a straight answer
Stairs firstWe plan them before anything else
Fixed quoteWritten, with allowances shown
Signed offBuilding control certificate, every time

What we do

Six rungs up the ladder.

Rung 01

Velux lofts

The roof keeps its shape and the light comes in through the slope. The cheapest, quickest way to a room, if you have the height.

From £32,000. About 5 to 6 weeks.

Rung 02

Dormer lofts

A box built out from the ridge at the back. Most of the floor becomes full height. The usual way to fit a bedroom and an ensuite.

From £42,000. About 7 to 8 weeks.

Rung 03

Hip-to-gable

The sloping end of your roof becomes a straight wall. On a 1930s semi it adds the room you need for a staircase and a real bedroom.

From £55,000. About 8 to 10 weeks.

Rung 04

Bedroom and ensuite

A shower room under the eaves, with built-in cupboards where the ceiling is low. Ensuite adds from £5,500.

Ensuite adds from £5,500.

Rung 05

Loft stairs

The staircase decides the whole loft. We plan it first: headroom, the landing you lose and the fire route out.

Included in every conversion. Oak upgrade from £1,800.

Rung 06

Regs and structural drawings

Drawings and calculations that building control will accept. Included in every job, or £1,650 for your own builder.

Included. Drawings-only package £1,650.

How it goes

From the tape to the folder.

  1. Measure it yourself

    Top of joist to underside of ridge, with a tape. Put it into the checker for a first answer.

  2. Free survey

    Dai or Bethan comes up with you, looks at the stairs and the structure, and tells you what is possible.

  3. Drawings and quote

    A fixed price and drawings within two weeks. Certificate and party wall notices sorted next.

  4. On site

    Scaffold first, stairs last. You stay at home. Building control visits at each stage, and you get the folder.

A new oak staircase with white spindles rising from a landing to a loft door, a roof window above

Stairs first

The stairs decide the whole loft.

Everybody thinks about the room. Then they find out the stairs take half the back bedroom, or that the only place they fit leaves 1.6 metres over the top step. Building regulations want about 1.9 metres at the middle of a loft flight, and so do your knees.

We draw the stairs before anything else. Sometimes that changes the type of loft, sometimes it means no. Either way, you find out at a free survey.

About stairs

How we work

What you can hold us to.

We say when it will not work

If the height, the stairs or the structure rule it out, you hear that at the free survey, with the measurements, not after a deposit.

One written price

A fixed quote with allowances spelled out. If you change something, you see the change on paper before we do it.

Our own team

Dai's carpenters, on our books, on your scaffold. Electricians and plasterers are the same people each job. Nobody disappears in week four.

The folder at the end

Building control certificate, electrical and gas sign-offs, warranties. Your buyer's solicitor will be pleased to see them.

  • 2.25 mridge to joist is about where most lofts start to work
  • 1.9 mminimum middle headroom on a loft staircase
  • 5–10weeks on site, by the type of loft
  • 0days without a roof over your head: we keep it weathered
A bright finished loft bedroom with white sloped ceilings, two roof windows, an oak floor and a rust throw on the bed

What you get

A real room, and a folder.

Full height where you stand up, cupboards where you cannot, windows where they help. And when you come to sell, a folder containing the building control certificate, the electrical and gas sign-offs and the guarantee.

See the gallery

Sample reviews

From the top floors of Cardiff.

All six
Dormer, Roath terrace

Dai came up with a torch and told me in ten minutes that our chimney breast was the real problem. He was right, and nobody else had spotted it. Eight weeks later we had a bedroom and a shower room up there.

Ceri and TomRoath
Hip-to-gable, Rhiwbina

The drawing on the photograph is what sold us. We could see what the side of the house would look like, and we could argue about it before we spent anything. The new render has settled in well.

Anwen P.Rhiwbina
Told it would not work

Our ridge came in at 2.02 metres. Bethan showed me the sums, said no, and wrote it down so that I would not be talked into anything. She suggested a ground-floor extension builder instead.

Geraint S.Splott

Questions from the landing

How do I know if my loft is high enough?

Measure from the top of a ceiling joist to the underside of the ridge, in the middle of the roof. About 2.45 metres suits a Velux loft and about 2.25 metres a dormer. Below 2.05 metres it rarely works without major structural changes. Use the checker, then ask us for a free survey.

How much does a loft conversion cost?

As a rule of thumb, a Velux loft from about £32,000, a dormer from about £42,000 and a hip-to-gable from about £55,000, depending on the house. Your written quote will be fixed. Ensuite, oak stairs and fitted storage are extras that we price separately.

Do I need planning permission?

Often not, because many lofts are permitted development up to a volume limit of 40 cubic metres on a terrace and 50 on a semi or detached. Conservation areas, listed buildings and front dormers are different. You always need building regulations approval.

Can we stay living in the house?

Yes. We work from the scaffold for most of the job and keep the roof weathered. The last week or two, when the stairs go in, are dusty. We warn you, and we seal off what we can.

Will it add value?

Usually, but we are builders, not valuers, so we do not promise a figure. Ask a local estate agent what a house on your street with one more bedroom sells for, and compare that with your quote.

What about the neighbours?

If you share a wall, the Party Wall Act means a notice, and we draft it. We also recommend a chat first. It usually takes one conversation and a cup of tea.

Go up with a tape. Then ask us up.

Measure joist to ridge and try the checker. Then book a free survey: Dai or Bethan will tell you what is possible, what it costs, and whether you should leave it alone.