Every loft type across every Havering roof line — dormer, mansard, hip-to-gable, L-shape, Velux. LDC or full planning route, building regulations, structural calculations and party wall notices, all fixed price.
In Havering — 1930s semi-detached dominates Hornchurch and Upminster; post-war in Harold Hill and Romford; Victorian in older Romford centre for the most part — a loft conversion drawings package is the full measured-survey-to-submission drawing set London Borough of Havering needs in order to determine an application: existing and proposed plans, elevations and sections at 1:100 and 1:50, a location and site plan, and the supporting statements the case officer asks for.
Prepared and reviewed by the chartered technologist team at Architectural Drawings London — MCIAT chartered, £2m PI insured.Last reviewed 2026-08-03.


Every loft type across every Havering roof line — dormer, mansard, hip-to-gable, L-shape, Velux. LDC or full planning route, building regulations, structural calculations and party wall notices, all fixed price.
Housing stock in Havering: 1930s semi-detached dominates Hornchurch and Upminster; post-war in Harold Hill and Romford; Victorian in older Romford centre.
Character: Outer east London; Metropolitan Green Belt covers north of the borough; permissive residential planning; strong PD use.
We confirm before quoting whether your Havering loft has the head height and structural capacity.
Most Havering loft conversions qualify for a Lawful Development Certificate. We check Article 4 and conservation constraints first.
Option studies including massing, internal layout and roof geometry.
Staircase Part K compliance, Part B fire escape, Part L insulation, Part E acoustic separation.
Ridge beam, purlins, steelwork, floor joist upgrade, dormer framing — chartered engineer sign-off.
Almost every Havering loft triggers Party Wall notices. We draft notices and coordinate with surveyors.

Single planning or regs submission.
Planning + building regs + structural.
Listed, conservation, complex sites.
Move the controls for an indicative figure. It anchors your budget — it is not a quote. Every project is priced after a free survey.
Build costs are separate and quoted by your contractor. See our published fees.
Every Havering postcode district we draw in, the stock that dominates it and the authority that validates a loft conversion there. Havering fees below are the statutory England rates for 2026, not loft conversion estimates.
| Postcode | Area | Dominant stock | What it means for a loft conversion |
|---|---|---|---|
| RM12 | Hornchurch / Elm Park | 1930s semi-detached | RM12 covers Hornchurch / Elm Park only; Havering Council handles the loft conversion, and Hornchurch / Elm Park case officers apply the RM12 conservation-area map. |
| RM13 | Rainham / Wennington | 1930s semi-detached | Rainham / Wennington sits wholly inside RM13, so Havering Council validates every loft conversion submitted from an RM13 address. |
| RM14 | Upminster / Cranham | 1930s semi-detached, Edwardian villas | Upminster / Cranham sits wholly inside RM14, so Havering Council validates every loft conversion submitted from an RM14 address. |
| RM1 | Romford Central | Victorian terraces, 1930s semi-detached, post-war flats | Romford Central sits wholly inside RM1, so Havering Council validates every loft conversion submitted from an RM1 address. |
| RM2 | Gidea Park | Victorian terraces, 1930s semi-detached, post-war flats | Gidea Park sits wholly inside RM2, so Havering Council validates every loft conversion submitted from an RM2 address. |
| RM3 | Harold Hill | Post-war estate | A loft conversion at an RM3 address in Harold Hill is determined by Havering Council under its own Local Plan policies for Harold Hill. |
| RM4 | Havering-atte-Bower | 1930s semi-detached dominates Hornchurch and Upminster; post-war in Harold Hill and Romford; Victorian in older Romford centre | RM4 covers Havering-atte-Bower only; Havering Council handles the loft conversion, and Havering-atte-Bower case officers apply the RM4 conservation-area map. |
| RM5 | Collier Row | 1930s semi-detached | RM5 covers Collier Row only; Havering Council handles the loft conversion, and Collier Row case officers apply the RM5 conservation-area map. |
Roof pitch, wall build-up and plot depth change every few Havering streets, and each one changes what a loft conversion can achieve at that address.
Havering conservation designations: there are 15 across Havering Council, Rainham Village, Romford Market, Upminster among them. Designation costs a Havering owner the permitted-development route: a loft conversion then needs a £548 householder application over 8 weeks, in place of the £249 prior approval route that takes 6 weeks. Hornchurch is the Havering designation that most often changes a loft conversion design.
Article 4 and your Havering loft conversion: Havering Council has made no borough-wide direction, so permitted development for a loft conversion in Havering generally survives outside Havering conservation areas and listed curtilages. A Lawful Development Certificate at £274 is how a RM1 owner records that a loft conversion was lawful.
The building fabric around Havering: 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. A loft conversion in Havering is scoped against that stock first, because it decides whether the scheme runs as permitted development, a £274 Lawful Development Certificate, or a full £548 application to Havering Council.
Sources for this Havering loft conversion 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.
Of 31 lawful development certificate appeals decided in Havering over the window covering appeals decided 2016-2026, Havering was upheld more often than most London councils — only 29.0% of appeals succeeded, against 37.5% across London. 9 were allowed and 22 dismissed. Most loft conversions run under permitted development and end in a certificate of lawfulness, not a permission. These 31 are the Havering cases where the council disputed that the work was permitted at all.
Half of those Havering appeals took more than 384 days to decide from the day the appeal started — time added on top of the council's own determination period, which is the argument for getting the application right first. 93.5% were decided by written representations rather than a hearing or inquiry, meaning the written case and the drawings were the whole of the evidence.
31 lawful development certificate appeals decided in Havering. Source: Planning Inspectorate casework, OGL v3.0.
Direct answers to the questions Havering homeowners ask every week about loft conversion drawings.
Start a free quote →Most loft conversions in Havering qualify as Permitted Development under the standard householder allowances — up to 40m³ for terraced or 50m³ for semi-detached, with matching materials and 20cm eaves setback. Flats, properties in conservation areas and listed buildings need full planning. We check eligibility at the free site visit.
Two costs matter for a Havering loft: our architectural package (planning route, building regulations and structural calculations, quoted as one fixed figure) and the builder's construction cost, which varies with loft type — a standard dormer is materially cheaper to build than a mansard. We quote the design fee up front; see our fees.
Mansards in Havering are less common historically — Havering Council considers each application on its merits. Rear mansards on suitable terraced or semi-detached properties, matching the roofscape, have a reasonable approval rate with the right design and supporting heritage commentary where relevant.
2.3m measured from existing ceiling joist to existing ridge is the practical minimum for a standard conversion in Havering. Below 2.2m usually requires dropping the ceiling below (reducing rooms on the floor beneath) or redesigning as a mansard.
Most Havering loft conversions trigger Party Wall Act notices — legal notices to all adjoining owners. Rear dormers can also prompt right-to-light considerations in dense terraced streets, particularly in Romford Market. We handle both processes.
Havering's 1930s semi-detached dominates Hornchurch and Upminster stock lends itself to rear dormers (most common), hip-to-gable (semi-detached), and mansard (period terraces and conservation contexts). Velux-only conversions are possible where ridge height allows. We recommend the best structural and planning route at survey.
We cover all Havering postcodes — RM1, RM2, RM3, RM4, RM5, RM7, RM11, RM12, RM13, RM14 — with surveyors based locally. Survey appointments within 3 working days. Our structural engineer is London-based and attends site when required.
Most Havering loft conversions require Party Wall notices to adjoining neighbours — typically for steel beam installation and/or raising the party wall. We can co-ordinate the notice process; our in-house engineer handles the structural element. The Act gives neighbours 14 days to respond.

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