UK labour vs materials: the divergence reshaping residential pricing

Why labour costs keep rising while materials have stabilised — and what it means for your quotes.

Trails Research·Updated 2026-04-18·6 min read

Latest quarter: . Source: ONS Labour Cost Indices, MHCLG Building Materials. Base: 2015 = 100.

The headline "UK construction costs are up X%" hides a much more interesting story underneath. Since 2022, labour and materials have behaved completely differently, and understanding the gap matters if you're pricing work today.

The divergence

Until 2021, labour and materials moved roughly in parallel. Then the post-Brexit labour shortage collided with the 2021 to 2022 supply-chain shock for materials. Materials shot up, then, as supply chains eased, stabilised and have been broadly flat since 2023. Labour shot up, didn't stop, and is still rising.

What's actually driving it

Labour: a persistent supply-side problem

Three structural forces push labour costs up and none of them are transitory:

  • Post-Brexit trade shortages. EU workers who were a significant share of the London construction workforce became harder to hire and retain. That constraint hasn't reversed.
  • An ageing workforce. CITB estimates tens of thousands of retirements per year in skilled trades, outpacing new apprenticeship entrants.
  • Competing demand from infrastructure. Large rail, energy and housing pipelines draw tradespeople away from residential work, bidding rates up across the sector.

Materials: a supply-chain shock that's mostly resolved

The 2021 to 2022 spike in materials was a genuine shock. Sawn softwood nearly doubled, structural steel rose 60%+, plasterboard had allocation shortages. What made it spike was the combination of post-Covid demand rebound with constrained logistics. What made it resolve was freight capacity coming back online, stockpiles rebuilding, and new capacity reaching the market. Materials will continue to move, but the shock dynamic is over.

Why this matters for small design-build firms

Four practical consequences if you run cost plans:

  1. Your labour assumptions need refreshing more often than your materials ones. If your cost-plan template was calibrated in early 2022, its materials rates are roughly right. Its labour rates are understating reality by double-digit percentages.
  2. Labour-heavy projects carry more fixed-price risk. A loft conversion is ~60% labour. A rear extension is ~50%. A basement is closer to 40%. The higher the labour share, the shorter your fixed-price quote should remain valid.
  3. Scope swaps away from labour save more than away from materials. If a client is looking to cut costs, changes that reduce trade hours (simpler finishes, fewer service runs, factory-made elements) now save more than changes that reduce materials spend.
  4. Wage inflation is a business conversation, not just a pricing one. If you employ tradespeople, their pay expectations are set by the same forces. Firms that treat wage inflation as an input-only risk get squeezed when their own team starts walking.

How long does this persist?

Nobody knows with certainty, but the structural drivers on the labour side are slow-moving. Short of a deep recession collapsing demand, or an immigration policy change increasing supply, labour costs are unlikely to flatten in the next 18 to 24 months. Materials are more volatile but currently close to equilibrium.

The sensible planning assumption for quotes priced in 2026: assume labour continues rising at roughly 4 to 5% per year, materials flat to +2%. Re-check next quarter when new data lands in the Cost Tracker.

Frequently asked questions

Why is UK construction labour inflation running higher than materials inflation in 2026?
The two cost drivers have decoupled since the 2022 supply chain peak. Materials stabilised as global shipping and commodity prices normalised after the post-Covid and Ukraine-war shocks. Labour has kept rising because the structural squeeze on supply has not eased: fewer EU-born workers post-Brexit per ONS Labour Force Survey, a shrinking apprenticeship pipeline despite the Apprenticeship Levy, and CITB levy plus employer NI increases raising the cost of each role filled. The result is a persistent gap of several percentage points year on year between the ONS labour and materials indices.
How do I use the labour versus materials split in a cost plan?
Split your cost base into labour-content and materials-content portions at the element level. NRM2 does not split this way natively, so most QSs apply an elemental rule of thumb: groundworks and masonry around 55% to 65% labour, carpentry first fix around 45% to 55%, MEP first fix 35% to 45% labour, finishes 50% to 60% labour. Apply the ONS labour index to the labour portion and the materials index to the materials portion separately, then weight-sum back to an elemental rate. This gives a more accurate re-indexing than a single blended COPI multiplier, especially on labour-heavy extensions.
When will UK construction labour inflation fall back in line with materials?
Not soon on current leading indicators. The ONS Vacancies survey shows construction vacancies persistently above the 2019 baseline. CITB's Construction Skills Network 2024 report projected annual recruitment needs of over 50,000 workers simply to replace retirement, which the domestic pipeline is not hitting. Absent a meaningful policy change on immigration, apprenticeships, or employer NI, the labour premium is likely to persist through 2026 and into 2027. The materials side could diverge further in the other direction if global steel and timber prices continue easing.
Which JCT contract option deals with divergent labour and materials inflation?
JCT Option C (the formula rule) splits the contract into work categories and applies separate indices to each, which is the mechanism that best reflects divergent labour and materials inflation. Option B (tax and levy fluctuations only) catches NI and CITB levy changes but not the underlying labour rate drift, so it underpays the contractor on labour-heavy work in the current environment. Option A (no fluctuations) puts all of the risk on the contractor. For projects over nine months with meaningful labour content, Option C is defensibly the right choice in 2026. See the companion guide on JCT fluctuation calculation.
Does the labour versus materials divergence affect residential more than commercial?
Yes, meaningfully. Residential extensions and loft conversions carry higher labour content than most commercial new-build because finishes, first fix, and joinery are labour-heavy and comprise a larger share of the elemental cost. A typical single storey rear extension is roughly 55% to 60% labour by value, where a steel-frame warehouse is closer to 35% to 40%. The ONS blended COPI understates the inflation impact on residential for this reason, which is why most residential QSs now separate the series when re-indexing cost plans.

About this data

This article uses live data from Trails Cost Tracker, aggregating ONS Construction Output Price Indices, MHCLG Monthly Building Materials Statistics. Data is auto-refreshed each quarter.

→ See the full Trails Cost Tracker→ Methodology and sources

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