What planning rules in Greenwich catch homeowners out?

Greenwich is one of London's most layered boroughs when it comes to planning. Between a UNESCO World Heritage Site, multiple conservation areas, dense clusters of listed buildings, and Thames-side flood zones, the rules that apply to your property can look completely different from those applying to your neighbour — even on the same street. Most homeowners assume the standard permitted development rules cover them, until they don't. The best way to avoid that assumption is to see what planning constraints are stacked against your specific address — free, in about a minute.

The UNESCO factor most people miss

Maritime Greenwich is a UNESCO World Heritage Site — and that status triggers Article 2(3) designated land rules across a significant area of the borough. What this means in practice is that permitted development rights that would apply elsewhere in London either don't apply here, or apply in a much more restricted form. Extensions, roof alterations, outbuildings — the thresholds that homeowners routinely look up online may simply not apply to your property. Most people find this out after they've started work, not before.

Conservation areas: it's not just about being in one

Blackheath, Charlton Village, and Eltham all sit within designated conservation areas. But being inside a conservation area boundary is only the beginning. The question that actually matters is what your specific property's position within that area means for your project — and that depends on factors like the character of your immediate street, what changes have already been approved nearby, and how Greenwich Council has historically interpreted the rules for your property type. Knowing you're in a conservation area tells you almost nothing about your actual odds.

Listed buildings and the Royal Naval College cluster

Listed buildings are concentrated around the Royal Naval College and Greenwich Park — but the listed building rules don't just apply to the building itself. Works to structures within the curtilage, or changes that affect the setting of a listed building nearby, can also require consent. This catches homeowners out repeatedly: they're not in a listed building, but they're close enough to one that it still matters.

The Thames frontage question

Properties along the river in SE10 and SE18 postcodes can fall within flood zones that add another layer of planning complexity. Flood zone designation affects what types of development are appropriate, can trigger additional assessments, and influences how applications are decided. If your property sits near the Thames and you're planning anything beyond minor cosmetic work, flood zone status is something you need to know about before you apply — not after.

What this means for your project

The rules in Greenwich aren't just more complicated than the national picture — they vary significantly within the borough itself. A loft conversion that sails through in one part of SE9 might face a completely different reception in SE3. The best way to know where your property actually stands is to check how projects like yours have been decided near your street — approval rates and refusal patterns tell you far more than the rules alone.

With a householder application fee of £548 and an 8-week decision window, getting this wrong costs real time and money. Before you commit to anything, see the approval record for projects on your street and what your constraint mix means for your odds — free, no signup needed.