Loft Conversion Planning Permission in
March (Cambridgeshire)
Most loft conversions in March fall under permitted development – up to 40 cubic metres for terraced houses, 50 for detached and semi-detached – but a front-facing dormer, exceeding that volume, or living in a conservation area all change the answer. Our free desktop study confirms exactly where your specific loft conversion stands.
Get Your Free Desktop StudyPermitted Development Or Planning Permission In March?
Permitted development for lofts is genuinely generous in March – up to 40 cubic metres of additional roof space for terraced houses, 50 for detached and semi-detached, with rear dormers commonly acceptable within that allowance. But the conditions attached are strict: no exceeding the existing ridge height, materials that match the existing house, and any dormer set back at least 20cm from the original eaves.
Front-facing dormers are treated completely differently in March – size doesn’t save you here, since a full application is almost always required because of the visual impact on the street. Plenty of homeowners get caught out not realising this before they start.
Volume allowance, dormer position, local restrictions – every March loft enquiry gets checked against all three before we tell you what your particular project genuinely needs.
Free Desktop Study
Confirms what your project actually needs
PD Or Planning
We check which route genuinely applies
Council-Ready
Applications built to be approved
Fast Turnaround
Applications moved along quickly
How We Help in March (Cambridgeshire)
First thing for any March loft: how much of your volume allowance is left, whether the dormer’s going front or back, and whether the area has any conservation status that changes the picture.
Once we’ve got that, you’ll know precisely where your March project stands – clear already, needing a full application, or a genuine mix depending on the specific elements involved.
March council timelines vary, so for any loft that genuinely needs an application, we stay involved right through, sorting issues as they crop up rather than after the fact.
Getting March Loft Conversions Right From The Start
No two roofs in March carry quite the same history, and that history – what’s been built up there before – directly affects what’s still available to you now. We check that specific history rather than guessing from the outside.
What we recommend for a March loft reflects your actual roof, not a sales target. Where permitted development genuinely applies, that’s the answer you get, plainly stated.
A dormer at the back under permitted development, a rooflight at the front that needs sign-off, a hip-to-gable change somewhere in between – March lofts genuinely combine routes more often than people expect, and we map out each piece individually.
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Loft Conversion Planning Permission FAQs for March
How much roof space can I add without planning permission in March?
The national limit is 40 cubic metres for terraced houses and 50 cubic metres for detached and semi-detached properties, but any previous roof extensions in March eat into that allowance – we work out precisely how much you’ve got left.
Does it matter whether my March dormer faces the front or rear?
Front dormers in March generally need planning permission because they affect how the house looks from the street, while rear dormers are usually covered without needing one at all.
What is the 20cm setback rule for March loft conversions?
Yes – any dormer relying on permitted development has to sit at least 20 centimetres back from the original eaves, a rule that’s the same in March as it is right across the country.
Does conservation area status affect my loft’s permitted development rights?
Conservation designation in March commonly cuts back on what’s automatically allowed for roof work, exactly the sort of location detail we check as part of the desktop study.
Do I still need Building Regulations approval if my March loft doesn’t need planning permission?
Building Regulations always apply in March, even for loft conversions that don’t need planning permission – it’s a genuinely separate legal requirement covering structural safety, fire escape, and insulation.
Is the desktop study free for March loft conversions?
There’s no charge for the March desktop study – it’s simply the starting point before any decision gets made about applications or fees further down the line.