Mansard Roof Extensions in Havering

Which postcode districts around Havering do we cover for mansard roof extension work?

Every Havering postcode district we draw in, the stock that dominates it and the authority that validates a mansard roof extension there. Havering fees below are the statutory England rates for 2026, not mansard roof extension estimates.

How does a mansard roof extension differ street by street across Havering?

Roof pitch, wall build-up and plot depth change every few Havering streets, and each one changes what a mansard roof extension can achieve at that address.

• Romford (RM1, RM2, RM7) — a mansard roof extension in Romford starts from victorian terraces, 1930s semi-detached, post-war flats, and Romford reads as Victorian and post-war centre. A mansard on a Victorian terrace almost always needs full planning permission in RM1. Havering Council assesses Romford mansard roof extensions against its own Romford character guidance, and the location plan we draw for Romford references Romford Market.
• Hornchurch (RM11, RM12) — 1930s semi-detached defines Hornchurch, where 1930s semi-detached set what a mansard roof extension can do. Mansards are rare on 1930s stock — the hipped roof form works against the geometry across RM11. Any Hornchurch mansard roof extension is validated by Havering Council, with Hornchurch Tube the usual Hornchurch reference point on the site plan.
• Upminster (RM14) — a mansard roof extension in Upminster starts from 1930s semi-detached, edwardian villas, and Upminster reads as 1930s semi-detached, Edwardian villas. Edwardian parapets give a mansard a clean base line in RM14. Havering Council assesses Upminster mansard roof extensions against its own Upminster character guidance, and the location plan we draw for Upminster references Upminster station.
• Rainham (RM13) — mansard roof extension work in Rainham means 1930s semi-detached. Rainham is 1930s semi-detached, village fragments. Mansards are rare on 1930s stock — the hipped roof form works against the geometry throughout RM13. Havering Council decides the Rainham application, and Rainham Village anchors the Rainham location plan.
• Harold Hill (RM3) — mansard roof extension work in Harold Hill means post-war estate. Harold Hill is post-war estate. Mansards on post-war blocks are a structural and fire-strategy exercise before they are an aesthetic one throughout RM3. Havering Council decides the Harold Hill application, and Harold Hill anchors the Harold Hill location plan.
• Collier Row (RM5) — mansard roof extension work in Collier Row means 1930s semi-detached. Collier Row is 1930s semi-detached, post-war. Mansards are rare on 1930s stock — the hipped roof form works against the geometry throughout RM5. Havering Council decides the Collier Row application, and Collier Row Road anchors the Collier Row location plan.
• Elm Park (RM12) — 1930s semi-detached defines Elm Park, where 1930s semi-detached set what a mansard roof extension can do. Mansards are rare on 1930s stock — the hipped roof form works against the geometry across RM12. Any Elm Park mansard roof extension is validated by Havering Council, with Elm Park Tube the usual Elm Park reference point on the site plan.

What local planning policy applies to a mansard roof extension in Havering?

How designation changes a Havering mansard roof extension: Havering Council maintains 15 conservation areas, including Upminster, Hornchurch, Rainham Village. Inside any of them a Havering mansard roof extension cannot rely on permitted development, and the route becomes a £548 householder application determined in 8 weeks rather than a £249 prior approval in 6 weeks. Hornchurch sets the tone for Havering casework.

Havering permitted development status: there is no borough-wide direction from Havering Council, so a mansard roof extension at a RM1 address is normally still permitted development. We certify that with a £274 Lawful Development Certificate rather than leaving a Havering sale to argue it later.

Havering housing stock: 1930s semi-detached dominates Hornchurch and Upminster; post-war in Harold Hill and Romford; Victorian in older Romford centre. Outer east London; Metropolitan Green Belt covers north of the borough; permissive residential planning; strong PD use. Read that before choosing a mansard roof extension route in Havering — construction, not postcode, sets what is achievable. Havering Council charges £548 for a householder application and has 8 weeks to determine it.

Which neighbouring authorities border Havering?

• Barking and Dagenham — cross the Havering boundary and Barking and Dagenham Council takes the mansard roof extension instead, applying 9 conservation areas of its own around IG11. We re-price mansard roof extensions at the Havering edge because Barking and Dagenham policy and Havering policy rarely align on mansard roof extension depth.
• Redbridge — the Redbridge boundary runs against Havering, so a mansard roof extension a street from Havering is decided by Redbridge Council instead. Redbridge runs 14 conservation areas across E11 and its neighbours, which is why mansard roof extensions priced for Havering are re-checked against Redbridge policy whenever the Havering address sits on that edge.

Sources for this Havering mansard roof extension page: borough policies maps and conservation-area registers (2025–26), Royal Mail postcode district boundaries, the Town and Country Planning (Fees for Applications) (England) Regulations, the Town and Country Planning (General Permitted Development) (England) Order 2015 as amended, and the Party Wall etc. Act 1996.