Scaffolding Costs and Licences for London Extensions 2025: What Homeowners Need to Know

**Scaffolding requirement for common London residential project types**:

*Loft conversions*:

A dormer loft conversion requires scaffold on the rear elevation for: removal of the existing roof covering and structure; construction of the dormer cheeks and flat roof; installation of roof windows and lead flashings; and installation of external render or cladding to dormer cheeks. The scaffold must typically provide full coverage of the rear slope and the dormer structure being built — a standard rear dormer scaffold on a 4–5m wide terrace house is typically 5–6 bays wide and 3–4 lifts high.

A Velux-only loft conversion (roof windows in existing roof slope with no dormer) typically does not require full tube-and-fitting scaffold — a mobile aluminium tower or MEWP (cherry picker) is often sufficient for the roof window installation, though this depends on roof pitch and the property configuration.

A mansard loft conversion (new mansard roof structure on a party wall or roof terrace conversion on a flat-roofed rear extension) requires significant scaffold — often a complex tube-and-fitting structure covering the full roof area.

*Rear extensions*:

A rear extension typically requires scaffold for: construction of the new cavity or solid wall above DPC level; installation of the flat or low-pitch roof structure and covering; and any brickwork requiring pointing or render at high level. For a single-storey rear extension (typical height 2.4–3.5m to eaves), scaffold may be minimal — some contractors use a low-level aluminium tower or hop-up platform rather than full tube-and-fitting scaffold. For a double-storey rear extension (5–7m to eaves), tube-and-fitting scaffold is standard.

*Roof repairs and maintenance*:

Chimney repointing, valley repair, ridge tile replacement, and flat roof replacement on Victorian terrace roofs almost always require tube-and-fitting scaffold on the rear slope and potentially the front elevation. Front-elevation scaffold on a London terrace requires a highway licence (see below).

*Full refurbishments*:

A full house refurbishment that includes external render repair, repointing, sash window replacement, or chimney works may require scaffold to multiple elevations simultaneously — front (highway licence required); rear; and possibly side. Where the front and rear scaffolds are erected simultaneously, costs increase significantly.

**Types of scaffold used in London residential construction**:

*1. Tube-and-fitting scaffold (independent tied scaffold)*:

The traditional form of scaffold — individual steel tubes connected by pressed-steel fittings (swivel couplers; right-angle couplers; putlog couplers) to create a modular structure. Tube-and-fitting scaffold is: adaptable to any building configuration; can navigate obstacles (bay windows; canopies; chimney stacks); can be modified in height as the work progresses; and provides a very stable working platform. It is the standard form of scaffold for London Victorian terrace rear elevations and loft conversions.

Requires a trained and CITB-assessed scaffolder (minimum Level 2 NVQ or CISRS Part 1 card) for erection and dismantling. All scaffolding must comply with BS EN 12811 (Temporary Works Equipment — Scaffolding).

*2. System scaffold (Layher Allround; Haki; Plettac)*:

System scaffold uses prefabricated components (rosette-based connection points; pre-fabricated beams; self-locking guardrails) rather than individual tube-and-fitting connections. Erection is faster than traditional tube-and-fitting but the system is less flexible for irregular buildings. System scaffold is more common in commercial construction but is sometimes used for larger residential projects (whole terraces; multi-unit refurbishments).

*3. Mobile aluminium tower (PASMA tower)*:

• A mobile aluminium tower (used with a PASMA — Prefabricated Access Suppliers' and Manufacturers' Association — trained operator) is appropriate for:
• •Internal works at height (plastering ceilings; electrical works at ceiling level; decorating stairwells)
• •Low-level external work (rendering a garden wall; painting a first-floor window frame from outside)
• •Single-point external access (installing a Velux window on a low-pitch roof from ground level)

Mobile towers are not appropriate for high-level working (above 6m); working in weather; or for the primary construction platform on a significant structural project.

*4. MEWP (Mobile Elevated Work Platform — cherry picker; scissor lift)*:

• MEWPs are hired with an operator (the operator must hold a IPAF card — International Powered Access Federation trained) and are appropriate for:
• •Single-point access tasks (chimney inspection; single roof tile replacement; one-off high-level inspection)
• •Urban sites where conventional scaffold erection would take longer and cost more than the access task itself
• •Tasks where the scaffold would obstruct highway access for longer than the access task requires

In London, MEWP hire typically requires a traffic management plan and potentially a highway licence if the MEWP occupies the public highway — the same permit requirements as scaffold.

*5. Crash deck and protective fan*:

In London urban environments, works on upper floors or roof level above a public footpath require a **crash deck** (a horizontal debris protection deck at first-floor level or above the footpath) and/or a **protective fan** (an angled debris deflector above the footpath) to protect pedestrians from falling materials. The local authority may require a crash deck as a condition of the highway licence. Cost of a crash deck: typically £1,500–£4,000 additional on top of the scaffold hire cost.

**Section 7 Licence under the Traffic Management Act 2004 — scaffolding on a public highway**:

In London, any scaffold structure that occupies or overhangs the public highway (the public footpath; the public road; any publicly maintained land) requires a **licence under Section 7 of the Traffic Management Act 2004** issued by the relevant London Borough (or TfL for TfL-managed roads). This includes:

• •Any scaffold that touches the public footpath — even a single standard projecting over the pavement
• •Any scaffold that projects horizontally over the public footpath
• •Any crash deck or protective fan at or above pavement level that overhangs the public footpath
• •Any skip on the public highway (a separate Highway Skip Permit — not covered by the Section 7 scaffold licence)

*Who applies for the Section 7 licence?*:

In practice, the **scaffolding contractor** applies for the highway licence on behalf of the building owner. The licence is issued to the scaffolding contractor as the 'relevant authority' responsible for the scaffold structure. The building owner (homeowner) is responsible for ensuring the licence is obtained before the scaffold is erected — failure to obtain a licence is a criminal offence under the Traffic Management Act.

• *What the licence requires*:
• •A site plan showing the scaffold footprint on the highway, the footpath clearance, and the highway layout
• •Public liability insurance (minimum £5M for highway scaffold; check with the local authority)
• •Traffic management plan where the scaffold reduces the footpath to below 1.5m clear width or affects vehicle lanes
• •The scaffold must be lit at night (amber warning lights at all points where it projects over the highway)
• •In some London boroughs, a pedestrian protection barrier and walkthrough may be required where the scaffold closes the footpath

*Section 7 licence fees in London (2025)*:

• Highway licence fees vary by London borough. Approximate ranges:
• •Central London boroughs (Westminster; Camden; Islington; Southwark): £400–£1,200 for a standard residential scaffold (up to 3 months)
• •Inner London boroughs (Lambeth; Wandsworth; Hammersmith; Tower Hamlets; Hackney): £250–£800
• •Outer London boroughs (Ealing; Barnet; Croydon; Bromley): £150–£500

• Additional costs that may apply:
• •Traffic management plan (required where footpath width is reduced below 1.5m): £500–£2,000
• •Licence extension fee (for each month beyond the initial licence period): £100–£400/month
• •Hoarding licence (where a site hoarding is erected on the highway): separate licence and fee

**Party Wall Act and scaffold airspace**:

A separate and frequently misunderstood issue arises where the scaffold for your project needs to **overhang your neighbour's land** — including the airspace above their garden, their roof, or their extension — in order to provide safe working access to your building.

*The legal position — airspace is owned by the landowner*:

The owner of a piece of land owns the airspace above it to a reasonable height. A scaffolding structure that overhangs your neighbour's garden or roof is a trespass into their airspace unless the neighbour gives permission.

*The Party Wall Act provision for scaffold access*:

Section 8 of the Party Wall etc. Act 1996 provides a right of access for a building owner and their workers to enter the adjoining owner's land (including the airspace above it) for the purpose of executing works under the Act. This access right arises automatically when a Party Wall Award (or Letter of Consent) is in place — no separate written consent is required for scaffold overhanging the neighbour's airspace where the Party Wall Award authorises the works.

*Where the Party Wall Act does NOT apply*:

• If your project does not trigger the Party Wall Act (for example, a Velux-only loft conversion that does not touch the party wall or excavate near the boundary), there is no automatic right to overhang the neighbour's airspace. In this case:
• •You must obtain **written consent** from the neighbour before erecting scaffold that overhangs their land
• •The consent should specify the period of the scaffold overhang and the terms of access
• •If the neighbour refuses consent, you may need to redesign the scaffold to avoid their airspace (which may significantly increase scaffold complexity and cost) or apply to the court for an access order under the Access to Neighbouring Land Act 1992 (a slower and more expensive route)

*Practical approach*:

Where possible, the scaffold should be designed by the scaffolding contractor to avoid overhanging the neighbour's airspace — this eliminates the consent requirement. Where overhang is unavoidable (very narrow side access; scaffold needed to reach the party wall junction), obtain written consent from the neighbour as part of the pre-construction process, alongside the Party Wall notification.

**2025 scaffold cost ranges for common London residential projects**:

Scaffold costs in London are significantly higher than in other UK regions because of: higher labour costs; highway licence fees; traffic management requirements in dense urban areas; the complexity of access in narrow Victorian terrace gardens; and the need for crash decks and lighting where the scaffold overhangs public space.

| Project type | Scaffold requirement | Estimated scaffold cost (erect; hire 8 weeks; dismantle) | |---|---|---| | Rear dormer loft conversion (4m wide) | Rear elevation only; 4 lifts; 4–5 bays | £1,800–£3,200 | | Rear dormer loft conversion (5–6m wide) | Rear elevation; 4–5 lifts; 5–7 bays | £2,500–£4,500 | | L-shaped dormer (wrap around) | Rear + side elevation; complex structure | £3,500–£6,500 | | Single-storey rear extension | Low-level platform; minimal scaffold | £600–£1,800 | | Double-storey rear extension | Rear elevation; 2–3 lifts; 4–6 bays | £1,800–£3,500 | | Front elevation (front fascia; chimney; etc.) | Front elevation + highway licence | £2,000–£5,000 | | Full-house scaffold (front + rear simultaneously) | Front + rear; highway licence | £4,500–£10,000 | | Roof repair / pointing (rear only; 4–6 weeks) | Rear slope platform; 3–4 lifts | £1,500–£3,000 | | Additional cost: crash deck (front over footpath) | Overhead deck 1.8–3m wide | £1,500–£4,000 | | Additional cost: weekly hire extension (per week) | Beyond 8 weeks | £100–£300/week | | Additional cost: highway licence (mid-London) | Section 7 TMA 2004 | £250–£1,200 |

*Note: These are scaffold supply-only costs — erection, hire, and dismantling. They exclude the contractor's management of scaffold arrangement and the cost of any structural modification required to the building to accept scaffold ties.*

**What scaffold costs are included in a principal contractor's quote?**

In most London extension and loft conversion contracts with a principal contractor (design-and-build), scaffold is included in the contract price — it is not itemised separately. However, the homeowner should confirm:

1. **Is the scaffold hire period sufficient for the build programme?** Most scaffold quotations include 8–12 weeks hire. If the build runs longer (which is common in London), additional hire charges apply — typically £100–£300/week. Confirm what the weekly extension rate is before signing the contract

2. **Is the highway licence cost included?** In some contractor quotes, the highway licence fee (£250–£1,200 depending on the borough) is listed separately as a 'provisional sum' or 'client to arrange'. Confirm whether the highway licence is included in the quote or is an additional client cost

3. **Who arranges the licence?** The scaffolding contractor (sub-contractor) applies for the licence; the principal contractor manages the process. Confirm that the principal contractor takes responsibility for obtaining the licence — if the licence is not in place before erection, the scaffold is illegal and the local authority can issue a stop notice

4. **Is the scaffold designed by a competent person?** For complex scaffold (front-elevation with crash deck; scaffold tied into a listed building; scaffold on soft or contaminated ground), a scaffolding design should be produced by a competent person (typically a scaffolding engineer). The NASC (National Access & Scaffolding Confederation) accreditation and TG20 guide should be referenced — TG20:21 is the current industry code of practice for tube-and-fitting scaffold design

5. **Party Wall and airspace consent**: confirm that the principal contractor has considered and addressed any scaffold overhang over neighbouring properties — and that the Party Wall Award (or written neighbour consent) covers the scaffold overhang period

**How to check whether your scaffold is safe (basic checks for London homeowners)**:

• •**Scaffold boards should be properly supported and toe-boarded** (a vertical board at the edge of the working platform to prevent materials and tools from being kicked off the edge)
• •**Guard rails at 900mm and mid-rail at 450mm** on all working platforms where there is a risk of a fall of more than 2m
• •**The scaffold should be tied to the building** at every other lift and at regular horizontal intervals — freestanding scaffolds (not tied) are extremely dangerous
• •**No significant deflection or movement**: the scaffold should feel rigid and stable when stepped on — wobbling or significant movement is a danger sign
• •**Scaffold should be erected and dismantled by CISRS card-holding scaffolders**: the CISRS (Construction Industry Scaffolders Record Scheme) card indicates the scaffolder's training and experience level — request to see the CISRS cards of the scaffolders on site