The Hertfordshire multiplier
BCIS Q2 2026 regional location factor x1.22[BCIS Q2 2026]. St Albans, Three Rivers, Welwyn-Hatfield strongest KDR demand.
£/sqm by tier in Hertfordshire
| Tier | £/sqm (regional) |
|---|---|
| Developer-spec | £2,013 to £2,440 |
| Mid-range | £2,440 to £3,050 |
| Premium | £3,416 to £4,270 |
| Architect-designed | £4,270 to £6,710 |
Planning context
Chilterns National Landscape constrains west Herts.
Temporary accommodation
ONS median 3-bed private rent £2,050/mo (May 2026 release)[ONS rents]. A 12-month build typically commits £20,910 to £28,290 of temp-accommodation budget.
Local detail
St Albans, Three Rivers (Rickmansworth, Chorleywood), Welwyn-Hatfield, and Hertsmere (Radlett, Bushey) are the highest-demand districts. East Herts, North Herts, Stevenage, Watford run mid-range. Broxbourne lower.
The Chilterns National Landscape (AONB) covers western Herts including Tring, Berkhamsted, and parts of Three Rivers and Dacorum. AONB policy requires materials and form to respect the landscape character; design-led pre-app essential.
Most Herts districts have published self-build registers and run CIL self-build exemption Form 7 procedure smoothly. Pre-app fees range £250-£800 depending on district and officer seniority.