Harrow Planning Consultant
A new Local Plan, now in force
Harrow adopted a new Local Plan in March 2026, so almost every policy reference an applicant relied on a year ago has changed. The borough also brought in a borough-wide HMO Article 4 Direction in June 2026. Cedar Planning helps homeowners, landlords and developers work with the new rules from the start.
Dan Malloy MRTPI, a Chartered Town Planner, leads the work. We are a Norfolk-based practice working across England, London included, and we visit Harrow sites whenever the brief calls for it.
- RTPI Chartered
- Fixed-fee quotations
- Direct advice from a Chartered Planner
Harrow's Local Plan 2021-2041 explained
The Harrow Local Plan 2021-2041 was adopted by Full Council at an extraordinary meeting on 24 March 2026, a week after the Inspector's report found it sound. It replaces the Core Strategy and the other plans adopted in 2012 and 2013, and now sits alongside the London Plan and the West London Waste Plan as the statutory development plan.
The plan was submitted in February 2025, examined at hearings in summer and autumn 2025 and amended through main modifications consulted on at the end of that year. Because it is now adopted, it carries full weight, and older policy numbers from the 2013 Development Management Policies should no longer appear in applications.
The plan provides for at least 16,040 new homes between 2021 and 2041. More than half are directed to the Harrow & Wealdstone Opportunity Area, which Policy SP05 plans for a minimum of 8,300 homes and around 1,268 jobs, with 40 site allocations across the borough.
The rest of the borough is largely suburban, with Metroland semis in Rayners Lane and Kenton, older village cores in Pinner and Stanmore, and Green Belt across the northern ridge. Policy there focuses on small sites, extensions and protecting character.
HMO Article 4 in force from 12 June 2026
Since 12 June 2026 a borough-wide Article 4 Direction has required planning permission to turn a family house into a small HMO for three to six people. Applications are assessed against Policy HO10 on housing with shared facilities, and the council has already refused several schemes under the new rules.
Harrow-specific planning issues
Policy GR4 confines tall buildings to zones in the Harrow & Wealdstone Opportunity Area, where maximum heights vary by location. Elsewhere, proposals of significant height face a strong presumption against.
Policy GR10 governs development on infill, backland, garage and garden land, a frequent route to new homes in Harrow's large suburban plots and a common source of objection.
Harrow on the Hill, Pinner Hill and Harrow Weald are Areas of Special Character in addition to conservation areas, so skyline and landscape setting are assessed closely.
Stanmore, Harrow Weald and the Bentley Priory area sit within Green Belt and Metropolitan Open Land, protected by Policy GI1 and national Green Belt policy.
How Cedar helps in Harrow
All work is quoted as a fixed fee after an initial review. These services come up most often on Harrow projects.
Householder Applications
Extensions, loft conversions and outbuildings on Harrow's inter-war semis and detached homes, prepared against Policy GR1 on design and the neighbour amenity tests.
View serviceHMO Planning Permission
Applications for small and large HMOs now that the Article 4 is in force, with the case built around Policy HO10, room standards and local concentration.
View servicePlanning Applications
Small housing sites, conversions under Policy HO2 and mixed-use schemes in Harrow and Wealdstone, including affordable housing under Policy HO4.
View serviceHeritage Statements
Assessments for Harrow on the Hill, Pinner High Street, Stanmore Hill and the other conservation areas, applying Policy HE1 on the historic environment.
View serviceGreen Belt Advice
Advice on extensions, replacement buildings and grey belt arguments for land in the north of the borough, with a realistic view of what national policy allows.
View serviceLawful Development Certificates
Certificates confirming permitted development for extensions and outbuildings, or the lawfulness of an existing use, before you build or sell.
View serviceNew policy codes applicants need to know
The 2026 plan groups its development management policies by topic. Design and place policies start with GR, from GR1 on achieving a high standard of development to GR4A on basements and GR5 on view management. Housing policies start with HO, including HO1 on dwelling size mix, HO3 on small housing sites and HO9 on large-scale shared living. Green infrastructure policies start with GI.
The London Plan 2021 still applies in full. SD1 on Opportunity Areas, D9 on tall buildings, H2 on small sites, G2 on Green Belt and G3 on Metropolitan Open Land are the policies that feature most often in Harrow decisions.
Harrow has charged its own Community Infrastructure Levy since 1 October 2013, in addition to the Mayoral CIL, and Policy GR11 deals with planning obligations on larger schemes.
Key policy areas we navigate
Scale, form and materials that respond to context, applied to everything from a rear extension to a block of flats.
Harrow's 30 conservation areas and its listed buildings, from the setting of Harrow on the Hill to Pinner's historic High Street.
A dedicated basement policy covers structural, drainage and amenity effects, which matters on sloping sites around the Hill.
Openness, the purposes of the Green Belt and the exceptions for extensions and replacement buildings.
A Consultancy That Works With You, For You
The new plan changes the language of every Harrow application. Statements that still quote 2013 policy numbers undermine an otherwise sound proposal, and officers now expect the new GR, HO and HE policies to be addressed directly.
Timing matters for landlords too. Small HMOs that began before 12 June 2026 may be lawful, and a certificate can confirm that, while new ones need a full application with evidence of need, quality and concentration.
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Led by a Chartered member of the Royal Town Planning Institute with more than ten years of public and private-sector planning experience.
Honest Prospects
A realistic view of the planning risks and options before you commit time or money.
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Fixed-fee quotations agreed before work starts, so you know the cost from the outset.
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You deal with the Chartered Planner doing the work, not an account manager.
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Harrow Planning FAQs
Which Local Plan applies in Harrow now?
The Harrow Local Plan 2021-2041, adopted on 24 March 2026. It replaced the plans adopted in 2012 and 2013 and carries full weight, together with the London Plan and the West London Waste Plan.
I already run a small HMO in Harrow. Do I need permission now?
Not if the use began lawfully before the Article 4 took effect on 12 June 2026 and has continued. A Lawful Development Certificate is the usual way to prove that, and it can help when selling or refinancing.
Can I build taller than the neighbours in Harrow town centre?
Only in the right place. Policy GR4 identifies tall building zones within the Harrow & Wealdstone Opportunity Area, each with maximum heights. Outside those zones, schemes of notable height are unlikely to be supported.
Can I extend a house in the Harrow Green Belt?
Extensions that are not disproportionate to the original building can be acceptable. Our guide to extending in the Green Belt sets out how size is judged.
Can I build a house in my Harrow garden?
Sometimes. Policy GR10 allows development on garden and backland land where it respects the area's character, access works and neighbours keep reasonable amenity. Plot size, access width and the street pattern usually decide it.
Do you visit sites in Harrow?
Yes, when it helps. We are based in Norfolk and work nationally, so we often start with a remote review of the policy position and history before arranging a visit to Harrow.
Get a Free Quote
Tell us what you are trying to achieve and where the property or site is. We will give you an initial view and a fixed-fee quote.
Or email us at info@cedarplanning.co.uk with the relevant information.
Planning a Harrow extension, HMO or new home? Book a free 15-minute call, or read our guides on HMO Article 4 and grey belt land.