Dormer Loft Conversion Arnold
Add a full bedroom and en-suite to your Arnold home with a dormer loft conversion. We design and build flat-roof and gable-fronted dormers across Arnold, from the semis around Front Street to the family homes near Arnot Hill Park.
One local team handles everything – design, structural calculations, Building Regulations and the full build – with a free site survey to start.
- Fixed-price quotes with no hidden extras
- Most Arnold dormers fall under permitted development
- Typical build time of 6-9 weeks
The most popular loft conversion for Arnold homes
A dormer conversion extends your existing roof outwards, usually at the rear, to create full head height and a box of usable space. For the 1930s-1960s semis and bungalows that make up much of Arnold, it is the most cost-effective way to add a proper double bedroom, often with an en-suite shower room, without touching your garden.
Many Arnold lofts have a low ridge or a shallow hip roof, which makes a simple rooflight conversion too cramped. A flat-roof rear dormer solves that. It gives you flat ceilings, standard windows and space for a full-size staircase, and it typically adds real value to homes in NG5.
We manage the whole project from our Nottinghamshire base, so the same people who survey your loft are the ones who sign it off with Gedling Borough Council’s Building Control at the end.
Best suited to
Arnold semis, terraces and bungalows with at least 2.2m at the ridge, where you want a bedroom plus en-suite or a large home office.
Quick facts
Build time: 6-9 weeks. Most rear dormers in Arnold need no planning application. You stay in the home throughout – we work from outside via scaffold until the stairs go in.
Why Arnold homeowners choose a dormer conversion
- Maximum usable space – a rear dormer can add 15-20 square metres of full-height floor area, enough for a double bedroom and en-suite.
- No garden lost – unlike a rear extension, all the new space comes from the roof, so your Arnold garden stays exactly as it is.
- Usually no planning application – most rear dormers on Arnold houses fall within permitted development rights, which keeps the timeline short.
- Strong added value – moving from a 3-bed to a 4-bed with en-suite is one of the best returns on investment for homes in NG5.
- Cheaper than moving – stamp duty, fees and moving costs to get an extra bedroom elsewhere in Arnold often exceed the cost of converting.
- Light and views – dormer windows plus rooflights on the front slope give bright rooms with views over the local rooftops.
How your Arnold dormer conversion works
Free survey
We visit your Arnold home, measure head height and roof structure, and talk through layouts and budget.
Design and drawings
We prepare drawings for the dormer, stairs and room layout, and confirm whether permitted development applies.
Structural calcs and approvals
Steel beam calculations and a Building Regulations application go in, plus a Party Wall notice if you are in a semi or terrace.
Scaffold and dormer build
We open the roof, fit the steels, and frame and weatherproof the dormer – usually within the first two weeks.
Windows, stairs and first fix
Windows go in, the new staircase is fitted, and electrics, plumbing and insulation follow.
Plaster and finish
Plastering, en-suite fit-out, doors, decoration and flooring to a ready-to-use standard.
Sign-off
Building Control issues the completion certificate and we hand over your finished room with guarantees.
Dormer loft conversion costs in Arnold
Guide ranges for 2026. Every roof is different, so we confirm a fixed price after a free survey.
| Dormer type | Typical scope | Guide price |
|---|---|---|
| Small rear dormer | One bedroom, no en-suite | £38,000 – £48,000 |
| Full-width rear dormer | Double bedroom plus en-suite | £48,000 – £62,000 |
| L-shaped dormer | Two rooms, suits some Arnold semis with rear additions | £60,000 – £78,000 |
| Gable-fronted dormer | Pitched-roof dormer for a more traditional look | £45,000 – £60,000 |
Prices include design, structural calculations, Building Regulations fees, scaffold, staircase and a standard finish. En-suite fittings, bespoke joinery and premium windows are priced separately in your quote.
Do you need planning permission?
📋 The rules in brief
Most rear dormers in Arnold are permitted development, so no planning application is needed if the dormer adds no more than 50 cubic metres (40 for terraces), sits behind the front roof slope, is set back from the eaves and uses materials that match the house. Dormers facing the road usually do need permission, and flats or previously extended homes may have used up their allowance. Gedling Borough Council is the local authority – we check your address and handle any application or lawful development certificate for you. Building Regulations approval is always required.
Loft conversions across the local area
Not listed? We cover most of Nottinghamshire – get in touch to check your postcode.
Dormer conversions we have built locally
What Arnold homeowners say
“Our semi near Arnot Hill Park now has a fourth bedroom with an en-suite. The dormer was watertight within two weeks and the team kept the disruption to a minimum. Building Control signed it off with no issues.”
“They confirmed our rear dormer fell under permitted development, which saved us weeks. Fixed price stayed fixed, and the finish on the bedroom is better than the rest of the house now.”
“We were quoted silly money by others to convert our bungalow off Gedling Road. This team designed a dormer that gave us two rooms upstairs and finished in eight weeks. Would happily recommend to anyone in Arnold.”
Dormer loft conversion questions from Arnold
Usually not for a rear dormer. Most Arnold houses have permitted development rights that cover a dormer of up to 50 cubic metres (40 for terraces). Front-facing dormers, flats and some previously extended homes do need permission from Gedling Borough Council. We check your address and handle any paperwork.
Most rear dormers on Arnold homes come in between £38,000 and £62,000 depending on size and whether you add an en-suite. L-shaped dormers cost more. We give a fixed written quote after a free survey, so there are no surprises.
As a rule of thumb you need about 2.2m from the top of the ceiling joists to the ridge. Many Arnold semis and bungalows meet this, and a dormer then creates full head height across most of the new room. We measure this for free at the survey.
Typically 6-9 weeks on site for a standard rear dormer in Arnold, plus 3-6 weeks beforehand for design, structural calculations and Building Regulations. We work from scaffold outside for the first stages, so you can live at home throughout.
Yes, in most cases. Moving from a 3-bed to a 4-bed with an en-suite is highly sought after in Arnold, and local agents typically value the extra bedroom well above the build cost. Exact figures depend on your street and the finish, which we can talk through at the survey.
Ready to convert your Arnold loft?
Book a free, no-obligation survey and get a fixed-price quote for your dormer loft conversion.