Knella Road, Welwyn Garden City
Two-storey rear extension.
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Hampshire Build serves Welwyn Garden City with expert architectural design. As a Garden City, many properties have unique design heritage - we're experienced with Welwyn's specific architectural requirements.
With fixed-fee packages from £1,950 + VAT, we deliver sympathetic extensions that complement the Garden City character.
Transform your loft into valuable living space. We understand the Garden City's unique architectural heritage.
From £1,950 + VAT
Sympathetic extensions designed to complement the Garden City's distinctive character.
From £1,950 + VAT
Expert navigation of Welwyn Hatfield Borough Council requirements and Garden City conservation.
From £1,950 + VAT
As a Garden City, many properties have unique design heritage. We're familiar with Welwyn's specific architectural requirements.
With excellent rail links to London (25 mins to King's Cross), Welwyn offers outstanding value. Extending preserves the Garden City character while adding space.
Garden City streetscapes make roof form, materials, front gardens and the relationship between houses particularly important. Extension and loft options should respond to the original building rather than treating the plot in isolation.
Check current Welwyn Hatfield Borough Council planning guidance
Meet our St Albans architectural design practice and see local projects
Pre-Build from £1,950 + VAT; Premium £2,950 + VAT; Premium Plus £3,950 + VAT. Compare the existing package scope. Building work and statutory fees are separate. Structural calculations are prepared by an independent qualified structural engineer.
Public council planning decisions
Updated 10 October 2026
In the 12 months to 10 October 2026, Welwyn Hatfield planning authority decided 82 householder home-improvement applications near Welwyn Garden City in the cached public records — 75 approved.
Two-storey rear extension.
Two-storey rear extension; Garage conversion.
Two-storey extension.
Single-storey side extension.
Home side extension.
Single-storey rear extension.
Two-storey rear extension; Garage conversion.
Single-storey side and rear extension.
These are public council decisions about other people’s applications. They are not Hampshire Build projects and do not predict the outcome of your project.