Structural Alterations Radlett

Structural alterations, new openings, underpinning and floor structures in Radlett, designed by the engineer we appoint and inspected at every stage.

Structural alterations in Radlett meet a set of local planning controls that do not apply in the towns around it. Hertsmere Borough Council has removed permitted development rights over named bungalows here, and the made Radlett Plan sets policy on what may replace them. We build to an engineer's calculations and work inside those controls rather than around them.

For Radlett, on London-derived ranges a simple new opening starts from £1,500, and underpinning a single elevation typically costs £6,000 to £21,000; Hertfordshire work generally runs below that. GS Renovation Ltd, a building contractor based in Potters Bar, does the work in Radlett.

Price guide

WorkIndicative range
Simple new openingfrom £1,500
Underpinning, single elevation£6,000 to £21,000
Major structural worksfrom £15,000

Indicative London ranges (MyBuilder and Checkatrade, 2026), not a quotation. Hertfordshire work generally runs below the London figures; your price follows a site visit. Prices checked September 2026. Full breakdown: RSJ & Load-Bearing Walls.

How the job runs

  1. Free site survey at your Radlett address and an itemised quote.
  2. The engineer we appoint designs the work, and it is registered with Hertfordshire Building Control or an approved inspector. On a shared wall you serve the party wall notice as building owner; we supply the drawings.
  3. Props and any trial holes first, then the opening, joists or underpinning in the engineer's sequence.
  4. Building control inspects each stage before it is covered, then issues the completion certificate.
A propped structural opening in a period terrace, carried out by GS Renovation, with the original timber lintel exposed
Acrow props on sole plates carry the floor while the original head is exposed.

The Article 4 Directions over Radlett's bungalows

Hertsmere Borough Council has made three Article 4 Directions over named bungalows in Radlett, covering ten numbered bungalow groups identified in the Radlett Plan. They remove Part 1, Class AA of Schedule 2 to the General Permitted Development Order, which is the right to enlarge a house by constructing additional storeys.

The council states that owners of the bungalows covered need planning permission to add an extra storey. That applies whether the storey is for extra living space or to create another self contained residential unit at first floor level. Identical work on a bungalow outside those groups is a different proposition. So the first thing to settle on a Radlett alteration is whether your address appears on one of the schedules.

Housing in Radlett

Radlett has around 3,500 homes on the Council Tax list: 67% post-war, 19% interwar and 12% predate 1919, with 24% flats and 76% houses. 47% of homes here are detached; a detached house in Radlett has its own footings, so underpinning often involves no neighbour.

Which bungalows are covered, and since when

The Direction covering Groups 1, 2, 3, 4 and 9 was confirmed on 25 May 2023 and modified by the Secretary of State on 14 June 2023. It applies to named bungalows on Theobald Street, Williams Way, Faggots Close, Craigweil Avenue and Newberries Avenue.

The Direction covering Groups 6, 7, 8 and 10 was confirmed on 12 June 2024, following a period of public consultation in 2023. It applies to named bungalows on Goodyers Avenue, Links Drive and The Close. The schedules list individual house numbers rather than whole streets. A neighbour being covered does not mean you are, and the reverse holds too, so we check the schedule against your address before scoping anything.

Policy HD7 of the made Radlett Plan

Policy HD7 governs what may replace or alter the identified bungalows. Policy HD7.1 covers development proposals that impact on any of the Radlett bungalows identified on the Policy HD7 map for their individual and/or group value. Those proposals should protect or enhance that contribution to local townscape character. Policy HD7.2 states that replacement of an existing bungalow or chalet bungalow identified for its individual and/or group value must be broadly commensurate in terms of its existing ridge height and respect its wider setting. Policy HD7 also requires applications to respond positively to and be in keeping with key features typical of local bungalows and their setting.

The plan carries that weight because it was made. Radlett has its own made neighbourhood plan, The Radlett Plan 2020 to 2036, with Aldenham Parish Council as the qualifying body and a local steering group set up to prepare it. It passed its referendum on 6 May 2021 and is used alongside the borough Local Plan to decide applications in the village. Around 75 per cent of votes cast supported using it, on a turnout of 44 per cent. The bungalow groups themselves came from a Radlett Character Assessment of 2016 and its addendum dated 2018.

Who decides, under which plan, and where demolition sits

The local planning authority is Hertsmere Borough Council, whose planning strategy team is based at the Civic Offices, Elstree Way, Borehamwood WD6 1WA. Its adopted development plan is the Hertsmere Local Plan 2012 to 2027, made up of four parts. Those are the Core Strategy, adopted 16 January 2013, the Elstree Way Corridor Area Action Plan, adopted July 2015, the Site Allocations and Development Management Policies Plan, adopted 23 November 2016, and the Policies Map. For householder work the relevant policies sit in the Core Strategy and the Site Allocations and Development Management Policies Plan. The Hertsmere Local Plan 2003 no longer has effect.

Radlett also has two conservation areas, Radlett (North) and Radlett (South), both designated on 20 April 1988. Demolishing a building, or the principal part of a building, in either of them needs planning permission from the council before work starts. This is known as relevant demolition, and carrying it out without permission is a criminal offence. Hertsmere's conservation areas page still uses the older name for that consent, which was abolished in England on 1 October 2013. Where an alteration involves taking a structure down, we put the question to the council in writing instead of assuming an answer.

  • Steel beam and RSJ installation
  • Party wall process explained, and work built to the award
  • Structural engineer appointed and coordinated for the design
Service areaRadlett · WD7
Local authorityHertsmere Borough Council
Part ofHertfordshire · about 6 miles from our base
Typical homesPost-war detached houses on wide plots along Watling Street
Housing stock12% built before 1919, 19% interwar, 67% post-war; 24% flats, 8% terraced, 63% semi-detached or detached, 5% bungalows
Also covered nearbyBorehamwood, Watford, Stanmore, St Albans and Edgware

VOA Council Tax stock of properties, March 2025, for Radlett. Counts rounded by the VOA.

Why Choose GS Renovation in Radlett

Structural alterations in Radlett are decided by a specific authority under a specific set of documents, and that is the part we take off you. The address is checked against the Article 4 schedules and the proposal is read against Policy HD7 and the borough Local Plan. The engineer we appoint then designs to what the consent will allow, rather than to a scheme that has to be redrawn later. We are fully insured, registered in England, company number 14611254, and building control applications and inspections are coordinated for you.

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FAQ

Frequently Asked Questions about Structural Alterations Radlett

How does your structural alterations price in Radlett compare with a national firm's?

National and local totals for structural alterations in Radlett are usually closer than the structures behind them, within £1,500 to £21,000 or more, from a simple opening to underpinning one elevation (London-derived). A national firm subcontracts the work and prices its overhead into your quotation; GS Renovation carries out the WD7 job itself. Ask both for the same breakdown, and check that each prices the work in its proper order: temporary support goes in before anything is removed.

If your bungalow is not named in an Article 4 schedule, can you add a storey without applying?

Not without an application of some kind. Class AA of the General Permitted Development Order, the right the Directions remove from the named bungalows, carries its own prior approval procedure covering matters such as external appearance and impact on neighbours. So a submission still goes to Hertsmere Borough Council, on a different form and against different tests. The made Radlett Plan is part of the framework used to decide applications in the village.

Does an Article 4 Direction mean an application to add a storey will be refused?

No. A Direction removes a permitted development right, so the work needs an application rather than becoming prohibited. That application is decided on policy, including Policy HD7 of the made Radlett Plan and the borough Local Plan. HD7.1 asks proposals affecting the identified bungalows to protect or enhance their contribution to local townscape character. A scheme designed against that test starts from a different position than one drawn without reading it.

Do the Radlett Article 4 Directions also cover garages, garden rooms and outbuildings?

No. The three Directions remove Part 1 Class AA, the right to add storeys, and Part 20 Classes AC and AD, the rights to create new units on top of a house. Outbuilding rights sit in a separate class and are untouched by them. Conservation area status and the borough Local Plan can still restrict what goes into a garden, so the address is checked against both before an outbuilding is designed.

Is raising the ridge of a Radlett bungalow to gain headroom treated as adding a storey?

That depends on what the finished building becomes, and it is a question for Hertsmere Borough Council rather than for a builder. Adding an extra storey is what the Article 4 Directions catch on the named bungalows. A conventional loft conversion with dormers is not caught. A raised ridge with rooms in the roof sits between the two, and Policy HD7.2 shows how much weight ridge height carries here. We put it in writing.

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