Maidstone, Canterbury, Tunbridge Wells, Dartford, Medway

Loft conversion in Kent: dormers, mansards and rooflights

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What type of property is it?

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Where is the job and how can we reach you?

Room to grow without moving house? Describe your loft in a few clicks and get a free, no-obligation quote from a loft conversion specialist working in your part of Kent.

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Is your loft tall enough?

The first thing a specialist will assess is the height. Measure the width inside the house and the height from the ceiling joists to the underside of the ridge, then adjust the sliders to see the usable floor area.

2.0 m above the new floor 1.5 m Ridge
From one side wall to the other, at the top floor.
From the top of the ceiling joists to the underside of the ridge.
0mHeight at the ridge above the new floor
0mFloor width with 2.0 m of headroom
0mFloor width with 1.5 m of headroom
0°Roof pitch from these two figures

The drawing takes 25 cm off the height for a new floor and insulation, and treats the roof as a plain pitched one. Chimney breasts, purlins and the roof shape change the real figures, so a specialist measures on site. The person is 1.75 m tall.

Cosy attic bedroom with a window seat and a bed under a sloping ceiling
A loft that earns its place

Four ways to convert a loft

Each one changes the roof differently. Pick a type to see what it involves.

What it is

Roof windows fitted into the current slope. It's the least costly and least intrusive option, but it requires sufficient existing height.

Best on

Homes with roof spaces tall enough that don't need much extra flooring.

Check first

The ridge height, chimney breasts, and potential stair placement.

What it is

A box shape built on the rear slope that increases floor space and headroom. This is the common option for terraces.

Best on

Terraced or semi-detached homes needing a full-height room at the back.

Check first

Whether it complies with permitted development and its visual impact on neighbours.

What it is

The sloped side of a hipped roof is converted to a vertical wall, allowing more room for a staircase and larger floor area.

Best on

End-of-terrace, semi-detached, and detached homes with hipped roofs.

Check first

Party wall regulations, and the appearance of the side wall from the street.

What it is

The rear slope is reconstructed to be nearly vertical with a flat top. It provides maximum space and generally requires planning permission.

Best on

Terraced houses where maximising floor space is crucial.

Check first

Planning permission and how it appears from the street.

From first visit to completion certificate

Six steps, in this order. Planning and party wall paperwork can run alongside the drawings.

Survey

Check the height, examine the rafters, chimney breasts, and potential stair positions.

Drawings

Architectural plans and structural calculations for the steel beams and new floor.

Permissions

Review planning requirements, or obtain a lawful development certificate if it's permitted development. Serve party wall notices if a shared wall is involved.

Building Regulations

Submit an application or a building notice, followed by inspections during construction.

The build

Start with steelwork and flooring, then the roof structure, stairs, insulation, electrics, and plastering. On-site work takes just weeks.

Sign-off

A completion certificate from building control. Keep it safe: solicitors for prospective buyers will request it.

Questions worth asking first

A loft conversion touches the structure of the house and the walls you share. These are the answers worth having in writing.

Does the cost include a structural engineer's design, and who covers the calculation expenses?
Who is responsible for sending the Building Regulations application and receiving the completion certificate?
Who handles the party wall notices, and who pays for the neighbour's surveyor if they appoint one?
Are protected stairs, fire doors, and interconnected smoke alarms included in the price? A loft with a bedroom needs an escape route.
Is payment broken down into stages that follow the progress of the work, instead of a hefty sum upfront?
What isn't covered: decoration, flooring, heating, and electrical certificates?
Dark wooden dormer window set into a shingled roof
Built to last, signed off by an inspector

All across Kent

Kent is a big county with many councils: Maidstone, Canterbury, Dartford, Tunbridge Wells and others each deal with their own planning. Housing runs from Victorian seaside terraces to market-town streets and village houses, and parts of the county lie in the Kent Downs or the High Weald, designated landscapes where extra rules can apply. Type your postcode in the quote form to check yours.

ME
  • Maidstone
  • Rochester
  • Chatham
  • Gillingham
  • Sittingbourne
CT
  • Canterbury
  • Margate
  • Ramsgate
  • Deal
  • Dover
  • Folkestone
TN
  • Tunbridge Wells
  • Tonbridge
  • Sevenoaks
  • Ashford
DA
  • Dartford
  • Gravesend
  • Greenhithe

Frequently asked questions

Do I need planning permission for a loft conversion in Kent?
Many are done under permitted development: the added roof space must not surpass 40 cubic metres for a terraced house or 50 for a semi-detached or detached one, the roof must not exceed the highest point of the existing roof, and nothing should extend beyond the front slope. Different rules apply to flats, conservation areas, and homes that have already been extended. Check with your local district council for your street.
Is Building Regulations approval always required?
Yes, any new room in the loft must comply with regulations on structure, stairs, fire escape, insulation, ventilation, and electrics, irrespective of planning permission needs. The inspector will provide final approval.
Do I need a party wall agreement?
If you share a wall with a neighbour, like in a terrace or semi-detached house, and the work affects it, such as when steel beams rest on it, the Party Wall etc. Act mandates you to give notice first. Your builder or architect can manage the notices.
How long does it take to complete a loft conversion?
On-site, a dormer conversion typically takes weeks. The design, drawings, and necessary approvals come first and add to the timeline, so begin planning from the initial survey rather than the scaffolding day.
How much height is necessary?
A standard starting point is around 2.2 metres from the ceiling joists to the underside of the ridge. The new floor and insulation will use some of this, and stairs also need headroom.
What should be included in a loft conversion quote?
The type of conversion, structural work, stairs, windows, insulation, electrics, plastering, architect and engineer fees, building control, party wall surveyors, VAT, payment stages, and exclusions.

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