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Last updated June 2025 — written by the project team at LD Design & Build, Northamptonshire
Project at a glance
- Property: mid-1960s detached house, brick cavity walls
- Scope: full exterior facelift, interior re-plan, new kitchen, floating stair, garden studio
- Build time: 28 weeks on site, plus 6 weeks for design and approvals
- Budget band: £300 k – £340 k (includes VAT and professional fees)
- Extra floor area: none — we kept the shell and invested in finishes and energy upgrades
Why the owners wanted a change
The brown-brick façade felt dated, the windows were small, and the entrance steps stayed damp all year. Inside, narrow corridors and boxy rooms blocked views to the garden. The owners loved the plot and village, so rather than knock down and rebuild they chose a smart conversion that would bring 2025 comfort and style to a 1960s shell.
Design principles
- Modernise without overpowering the street: white render and a strip of warm stone soften the cubic form while keeping the original roof line.
- Let light travel the full depth of the plan: bigger openings, a floating stair and plenty of glass do the heavy lifting.
- Add value through finish, not footprint: keep the external walls, pour the budget into materials, joinery and performance upgrades.
Exterior facelift – from brown brick to crisp render
- Silicone render in an off-white tone brightens the frontage and shrugs off algae.
- Split-face stone slips nod to local limestone boundary walls and break up the massing.
- Anthracite aluminium windows ordered 14 weeks in advance to avoid delays.
- A new porch canopy frames the doorway and hides external pipework.
- Rear elevation gains a 4.8 m sliding door set and a first-floor Juliet balcony.
Inside story – opening up without extending
Structural tweaks, not major surgery
Steel beams now carry the central spine, giving an unobstructed line of sight the moment you enter.
The kitchen that anchors the ground floor
- Three-metre porcelain-clad island with an under-mounted sink and pop-up sockets.
- Handle-less textured-oak doors hide an integrated fridge, freezer and pull-out larder.
- Glass-amber pendants add warmth against the calm monochrome palette.
That staircase
Each white-oak tread cantilevers from a concealed concrete stringer. Low-energy LED strips wash the treads from below, doubling as night lighting and a subtle show-piece.
Garden studio and landscaping
A 15 m² rendered garden room sits comfortably under Permitted Development. It runs on a single infrared panel heater and hard-wired data, so no wet trades or radiators. Gabion baskets filled with local stone hold back the slope and double as informal seating when the patio doors slide open.
Costs and timeline
- Design & planning: 6 weeks – approx. £12 k
- Strip-out & structural: 4 weeks – approx. £35 k
- Exterior envelope: 7 weeks – approx. £78 k
- Mechanical & electrical: 4 weeks – approx. £32 k
- Kitchen & bespoke joinery: 4 weeks – approx. £48 k
- Finishes & flooring: 5 weeks – approx. £46 k
- Garden studio & landscaping: 4 weeks – approx. £42 k
- Contingency (12 %): allowed £34 k; 9 % used, remainder went on upgrade choices
- Total on-site programme: 28 weeks
- Total spend: roughly £327 k
Five lessons for your own conversion
- Book windows first. Lead times still swing without notice.
- Render needs a dry shell. Schedule it late so moisture has a chance to escape.
- Invest in lighting design. Stair LEDs cost less than 1 % of budget yet lift the whole house.
- Keep neighbours in the loop. A coffee and a copy of the noisy-day schedule avoided complaints.
- Carry a realistic contingency. Hidden drainage ate 9 %; the rest funded the tap upgrade the owners fell in love with.
Ready to modernise your own home?
If you own a 1950s-70s property in Northamptonshire, re-thinking what you have often beats starting from scratch. Book a free site visit with LD Design & Build to explore budgets, timelines and options tailored to your address.
