Area guide · WD7
House Extensions in Shenley (WD7)
Thinking about extending a house in Shenley? This green belt village above Radlett offers something scarce in our patch: genuinely modern houses on genuinely generous plots. Much of Shenley's stock arrived in the 1990s when the old hospital parkland was redeveloped, so the village is full of executive detached homes that are well built but planned for how families lived thirty years ago. Reworking them, glazed kitchen-garden wings, reconfigured ground floors, extension-plus-remodel programmes, is the classic Shenley brief, and the village's other stock, from period cottages on the old lanes to farms on the fringes, brings its own versions. Everything sits inside the green belt conversation, which is home ground for us.
Live planning data
What Hertsmere approves in Shenley
Shenley applications go to Hertsmere Borough Council, whose register is clearing the staples steadily: the latest published pull shows rear extensions and lofts leading a healthy sheet of approvals across the borough. Nothing about the village stops that pattern; the green belt simply adds the proportion frame around the bigger schemes.
The Shenley-specific insight is about the 1990s houses. Because they are recent, most have never been extended, so their full original-building allowance is intact. That makes the village unusually good territory for substantial single applications: a double-storey rework or a large glazed rear that would be a squeeze on a much-extended older house sails through the arithmetic here. Getting that argument right is exactly the material in our green belt guide, and the scale of brief it unlocks is why Shenley belongs in the luxury extensions cluster.
Approvals pattern drawn from Hertsmere's public register, describing what the borough is passing rather than anything about our own jobs.
Local knowledge
Shenley's stock, in three kinds
The executive detached generation. The village's 1990s houses have good bones, double garages and plots their layouts never exploited. The brief is transformation rather than repair: a wide glazed rear (£50,000 to £110,000) opening a dated kitchen to the garden, or a double-storey rework (£90,000 to £200,000) that finally matches the upstairs to the plot.
The old village. Along London Road and Rectory Lane, cottages and period houses reward quieter work: matched brick, careful roof junctions, additions that keep the lane's character. Some carry designations, which we confirm plot by plot.
The parkland and farm edges. On the fringes, houses sit against open green belt with long views. Here siting is the design problem: additions tucked behind the building line, dark quiet rooflines, landscaping that stitches the plot back into the countryside. Done well, these are the schemes officers approve with enthusiasm.
Every street is different. That's the point.
We design to Shenley's stock and to what the council demonstrably approves — not to a template. A free site visit tells you what your house can take.
Get my free estimateHonest numbers
What an extension costs in Shenley in 2026
All-in build ranges, excluding VAT, professional fees and kitchen fit-out:
| Extension type | Typical Shenley cost | On-site time | Usual planning route |
|---|---|---|---|
| Side-return extension | £45,000 to £80,000 | 2 to 3 months | Often permitted development |
| Single-storey rear | £50,000 to £110,000 | 3 to 4 months | Often permitted development |
| Kitchen extension (incl. mid-range kitchen) | £65,000 to £130,000 | 3 to 4 months | Often permitted development |
| Hip-to-gable loft + rear dormer | £60,000 to £105,000 | 6 to 10 weeks | Usually permitted development |
| Wrap-around extension | £85,000 to £165,000 | 4 to 6 months | Full application |
| Double-storey rear | £90,000 to £200,000 | 5 to 7 months | Full application |
Work to £3,000 to £4,800 per square metre depending on specification. The larger programmes are banded honestly in the luxury extension cost guide, and every project ends in a fixed, itemised quote after a free visit.
Permissions, handled
Planning in Shenley: the green belt, used well
The proportion test, with headroom. Green belt extensions are measured against the original building, and Shenley's younger stock usually has its allowance untouched. We confirm the baseline for your house and design to it with margin.
Permitted development survives here. The village core aside, most plots keep the 4m and prior-approval 8m rear allowances plus the loft volume. Everything built under PD gets a Lawful Development Certificate so the position is documented.
Sensitive edges. Against open countryside, siting and landscaping decide applications as much as floor area. We design for the long view as well as the boundary.
The practicalities. Householder decisions take roughly eight weeks at Hertsmere; the Party Wall Act applies to boundary excavation as usual, with surveyor costs of £1,000 to £2,500 per affected neighbour where appointed.
How it works
How it works
- Free design visit. Original-building baseline established, plot walked, honest advice on scope and budget.
- Design and drawings. Composed to exploit the plot and satisfy the proportion case in one move.
- Planning, handled. Application managed through Hertsmere to the decision notice.
- Fixed-price build. One itemised number signed, that number paid, handover immaculate.
Questions, answered
Shenley extension FAQs
Can I extend a 1990s house in Shenley's green belt?
Usually generously, because most of the village's newer houses have never used their original-building allowance. The proportion test still applies, but with full headroom a substantial extension is normally a winnable case, and we build that case into the application.
What does an extension cost in Shenley?
Plan on £3,000 to £4,800 per square metre in 2026. Single-storey rears typically run £50,000 to £110,000 and double-storey reworks £90,000 to £200,000, excluding VAT and fees. Every quote is fixed and itemised.
Does permitted development work in the village?
On most plots, yes: the standard rear allowances and loft volume survive, and prior approval can take a detached rear to 8m. We check whether your plot carries any restriction and certificate everything built under PD.
Which council decides Shenley applications?
Hertsmere Borough Council, with householder decisions in roughly eight weeks. We prepare and manage the application end to end.
Are the older village houses harder to extend?
Different rather than harder: the lanes reward matched materials and quiet massing, and any designation on a specific plot changes the route. We confirm what applies to your house before design starts.
How quickly can we start?
Design takes a few weeks, planning around eight, and site time runs three to seven months by scale. You get honest programme dates with your quote.
What clients say
Rated 5.0 on Google
“Used The Extension Company for a loft conversion on our semi detached in Barnet and couldn't be happier. They explained what was possible at the first visit, sorted the planning side, and gave a fixed price with no surprises at the end.…” read the full review
“Really impressed with the entire project. The side extension and conservatory have been finished to a very high standard and the team made the process straight forward and stress-free. It’s transformed the space and added so much value, would definitely recommend.”
“Brilliant experience with the extension company, transparent from the word go. Completed a double story extension for me and I couldn’t be more pleased. Thank you”
“I got the extension company to do a bathroom refurb for us a January they done a great job they managed to fit in a large shower as well as a bath”
Reviews shown word for word from our Google profile. Read all 8 reviews on Google
Free site visit
Ready to see what's possible on your street?
Free site visit anywhere in Shenley, honest feasibility advice and a fixed, itemised price — design, planning and build handled end to end by the Pine Grove team.
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