Velux vs Dormer Loft Conversion
So, you're staring at your dusty attic and wondering how to turn it into something actually useful. Velux or Dormer? That's the big question. Both can turn dead space into a room you'll actually use, but they're totally different beasts when it comes to cost, space, and how much hassle you're signing up for. Here's the real talk on which one fits your situation.
What is the Main Difference Between a Velux and a Dormer Loft Conversion?
The straightforward difference? A Velux conversion keeps your roof exactly as it is. You're just cutting holes and popping in windows that sit flush with the slope. No structural changes to the roof shape at all. A dormer, though, adds a whole box sticking out of your roof. It changes the profile completely, giving you extra headroom and floor area because that box pushes into the void.
Put simply: Velux works with what you've got; dormer tears up the plan and starts fresh.
Velux vs Dormer: Which is Cheaper?
Velux is the budget option, no contest. In the UK, you're looking at maybe £20k to £30k for a Velux conversion. A dormer? That'll set you back £40k to £55k easily. The difference is all that structural stuff — new roofing, proper insulation, cladding on the outside. It adds up fast.
But here's the thing — cheap now doesn't mean cheap later. Dormers tend to add more value when you sell. We're talking maybe 20% property value bump versus 10-15% for Velux. If you're planning to move in a few years, that might swing things.
Which Conversion Adds More Space?
Dormer wins this one by a mile. A Velux conversion only gives you usable space where the ceiling's at least 2.2 meters high — that's usually just the middle strip of your loft. A dormer, though, pushes right to the eaves, potentially doubling your floor space. It's a game changer if you're trying to fit a proper bedroom up there.
Here's a quick comparison to make it clearer:
| Feature | Velux Conversion | Dormer Conversion |
|---|---|---|
| Headroom | Limited to roof slope; often only 1-2m wide usable space | Full standing height across the dormer width |
| Floor Space Added | Minimal; typically 10-20 sqm | Significant; often 20-40 sqm |
| Planning Permission | Usually Permitted Development | Often requires planning permission |
| Light | Excellent natural light (windows face sky) | Good light but windows are vertical |
| Property Value Increase | 10-15% | 15-20% |
| Disruption | Low; exterior unchanged | Moderate; scaffolding and roof work |
Do You Need Planning Permission for a Velux or Dormer?
Velux is usually straightforward — it falls under Permitted Development as long as you follow the rules (windows can't stick out more than 150mm from the roof). Dormers are another story. Since they change the roof's shape, you'll probably need planning permission, especially if it's on the front of the house or you're in a conservation area. Don't skip checking with your local council — it's a nightmare if you get caught.
Which Conversion is Better for a Bedroom?
If you want a proper master bedroom — one with space for a double bed, wardrobes, maybe an en-suite — go dormer. That extra headroom makes all the difference. Velux is better for smaller spaces: a home office, a kid's room, or a guest room where you don't need to walk around much. Honestly, for a main bedroom, dormer's the way to go.
Frequently Asked Questions (FAQ)
Can I add a bathroom to a Velux loft conversion?
Yeah, but it's tricky. You've got to make sure the floor joists can handle the weight (especially a bath) and sort out ventilation. Dormer conversions make this way easier because there's more room to play with.
Does a Velux conversion need building regulations?
Absolutely. All loft conversions need to meet Building Regs — fire safety, insulation, structural stuff. You'll need a structural engineer to check load-bearing requirements regardless of which option you pick.
Which conversion is faster to complete?
Can I have both Velux windows and a dormer?
Definitely. Lots of people do this — a dormer for the main space and Velux windows on the rest of the roof to bring in light and air. It's a smart combo for bigger conversions.
Expert Insights
Surveyors say it all comes down to your existing roof. Got decent headroom already — over 2.2m — and only need a small room? Velux is the smart money. Limited headroom but want a full room? You need a dormer. For terraced houses with low-pitched roofs, dormer's often the only game in town.
One thing people forget: check your party wall agreements if you share a wall. Dormers especially might need a party wall award, and that's extra hassle and cost.
Checklist: Making Your Decision
- Budget: Can you afford £40k+ for a dormer, or is £25k for a Velux more realistic?
- Space Needed: Do you need a full-sized room or just a small study/guest room?
- Planning Permission: Are you in a conservation area or have restrictive covenants?
- Roof Pitch: Is your roof steep enough for a Velux to be effective?
- Future Plans: Are you planning to sell soon? A dormer typically adds more resale value.
- Disruption: Can you handle 6-8 weeks of construction noise and scaffolding?
Resumen Rápido
- Velux es más barato y rápido: Ideal para espacios pequeños, buena iluminación natural y sin necesidad de permiso de obra en la mayoría de los casos.
- Dormer ofrece más espacio y valor: Perfecto para habitaciones principales, baños o salas de estar, pero requiere más inversión y tiempo de obra.
- La elección depende de tu espacio existente: Si ya tienes altura libre, Velux funciona. Si no, un Dormer es la única opción para ganar metros.
- Combinar ambos es una estrategia ganadora: Muchos propietarios instalan un Dormer para el espacio principal y Velux para iluminar el resto del ático.
