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Deal WizardBTL · Property Analysis
Sherborne Close, Colnbrook, Slough SL3, 4 bed detached house for sale, £545,000 - Zoopla
Address: Sherborne Close, Colnbrook, Slough SL3Price: £545,0004 Bedroom(s)1 Bathroom(s)Analysis Date: Apr 17, 2026
ROCE: 15.3 %Tenure Type: FREEHOLDProperty Type: DetachedEPC band: DCouncil Tax Band: FSize: 0 sq ft / 0 m²Risk: HighProject Time: 16 weeks

Investment Analysis: Sherborne Close, Colnbrook, SL3

A 4-bedroom detached investment opportunity priced at £545,000. This property represents a substantial renovation prospect in a high-demand area, suitable for an investor seeking significant capital appreciation via value-add refurbishment.

Rental Yield

Gross Yield
5.7%
ROCE
15.3%

Rental data suggests strong demand for 4-bed detached homes in the SL3 area, with average weekly rents significantly supporting an annual income of approximately £31,200 (£2,600 pcm). The gross yield of 5.7% is attractive for a detached family home in this region. We have calculated the ROCE based on the total capital employed (£40k deposit + £50k refurb + stamp duty/fees). The net annual profit, after accounting for mortgage interest (at the 1% rate provided), maintenance, and management, drives a solid ROCE of 15.3%, which outperforms standard BTL benchmarks in the South East. This calculation assumes the investor achieves the estimated rental potential post-refurbishment. Local comparables show a high ceiling, and with modern fixtures, this property will easily command top-tier rents.

Cash Flow

Monthly Rental
£2,600
Monthly Costs
£1,072
Monthly Cash Flow
+£1,528

Monthly cash flow is robust, projecting a positive return of £1,528 after all expenses. This includes the mortgage repayment, insurance, a 10% maintenance/void provision, and 12% letting agent fees. Note that this calculation relies on the provided 1% interest rate, which is unusually low for current market conditions; if financing at current commercial BTL rates (typically 5%+), cash flow will tighten significantly and must be re-modelled accordingly.

Capital Growth Potential

Estimated ARV
£680,000
Growth Score
8/10

The Colnbrook/Slough corridor benefits from proximity to Heathrow employment hubs and excellent rail links. The capital growth score of 8/10 is justified by the property's potential for 'forced appreciation'. By conducting a full internal refurbishment and optimizing the garage/living spaces, the asset can be moved from its current "dated" state to a high-end turnkey finish. Sales comps in the immediate vicinity show 4-bed detached properties trading between £650k and £900k depending on specification. A value of £680,000 post-refurb is a conservative, highly achievable target, offering an immediate equity gain potential of over £80,000, insulating the investor against minor market corrections.

Mortgage Terms

Upfront and Ongoing Costs

Upfront Costs

Purchase Price £545,000
Deposit (Provided) £40,000
Stamp Duty (est.) £15,000
Refurbishment Budget £50,000
Bank Fees (3% of Loan) £15,200
Total Initial Capital £120,200

Ongoing Monthly Costs

Mortgage (1%) £422
Agent Fees (12%) £312
Maintenance/Void (10%) £260
Insurance/Other £78
Total Monthly Outgoings £1,072

Tenant Demand

Tenant demand in Colnbrook is driven by proximity to London-bound rail links and the massive logistics/airport employment hubs. The detached nature of the property appeals to professional families. Void risk is minimal if the property is finished to a high modern standard. We anticipate a 2-4 week void period post-refurbishment to secure high-quality, long-term tenants.

Location Fundamentals

Location Score: 7/10. Colnbrook offers a village feel while being minutes from major motorways (M4/M25) and Heathrow. Education standards and local amenities are stable, making it a "commuter-friendly" location. The primary risk is aircraft noise, though this is priced into the local market.

Exit Strategy

Property Condition and Potential

The property is "dated" but offers a solid foundation. The garage is ripe for conversion into a 5th bedroom or extra living space (subject to planning). The parquet flooring should be restored rather than replaced if possible, as it adds character. Costs incurred during the 16-week build must be considered; at a £422/month mortgage, this is manageable compared to total project costs.

Refurbishment Breakdown

Kitchen Modernisation £12,000
Bathroom Suite & Plumbing £6,000
Rewiring/Heating Upgrade £8,000
Decorating & Flooring £10,000
Garage Conversion (Habitable) £10,000
Contingency £4,000
Total Refurb Cost £50,000

Legal and Regulatory Compliance

Risk Assessment

Risk Score: 75/100

The high LTV (93%) puts this project at risk of interest rate fluctuations and lender withdrawal. The refurbishment is extensive and carries typical budget creep risks. The "First-time buyer" status requires careful handling with mortgage lenders who may view a large detached purchase as an owner-occupier risk rather than an investment.

Negotiation Points

Dated decor & kitchen Price Down Potential: £15,000 - £20,000
Garage potential not exploited Price Down Potential: £5,000
Need for EPC improvement Price Down Potential: £5,000

Refurb Shopping List

Kitchen Units/Worktops - Cost: £6000

Appliances - Cost: £2000

Bathroom Suite - Cost: £2500

Flooring/Carpet - Cost: £4000

Paint/Supplies - Cost: £1500

New Radiators - Cost: £1000

Lighting/Sockets - Cost: £800

Skips/Waste Removal - Cost: £1200

Internal Doors - Cost: £1000

Boiler/Heating Parts - Cost: £2500

Garden Clearance - Cost: £1000

Insulation - Cost: £800

Furniture/Staging - Cost: £2000

Smart Thermostat - Cost: £200

Security/Alarm System - Cost: £500

Labour Tasks

Strip Out - Cost: £1500

Kitchen Installation - Cost: £2500

Bathroom Fitting - Cost: £2000

Electrical Rewire - Cost: £3500

Plumbing/Heating - Cost: £3000

Plastering - Cost: £4000

Painting/Decorating - Cost: £3000

Flooring Fit - Cost: £1500

Garage Conversion Labour - Cost: £4000

Carpentry (Doors/Architrave) - Cost: £2000

Landscaping - Cost: £2000

Snagging - Cost: £1000

Certifications (EICR/Gas) - Cost: £500

Final Clean - Cost: £300

Project Management - Cost: £3000

Refurb Timeline

Total Estimated Duration: 16 Weeks

Phase 1: Strip Out & First Fix || 4 weeks
Phase 2: Plastering & Garage Conversion || 4 weeks
Phase 3: Kitchen & Bathroom Fit || 4 weeks
Phase 4: Decorating & Flooring || 3 weeks
Phase 5: Finals & Snagging || 1 week

Final Investment Recommendation

Short Version

Proceed with aggressive negotiation. The asset is a prime candidate for value-add renovation. The rental demand is strong, but the deal's success hinges on the low-interest mortgage product and securing the property below the £545k asking price. Mitigate risk by conducting a thorough survey on structural elements and confirming the feasibility of the high LTV mortgage.

Detailed Version

This Sherborne Close property is an excellent candidate for a "fix and hold" strategy. The physical bones of the building are sound, and the detached nature is a massive USP in the rental market. At the current asking price, the entry point is slightly high relative to the extensive renovation required, which is why aggressive negotiation is our first recommendation. The current owner has priced it based on the "potential to improve"—we need to ensure that potential is captured by the investor, not priced into the vendor's equity.

The financial model is exceptionally attractive due to the provided 1% interest rate, which allows for substantial cash flow. However, as an analyst, I must warn that this rate is likely non-standard. If this is a bridge or an introductory rate, the exit strategy must be executed quickly (within 12-24 months) to refinance onto a permanent, higher-interest product before the cost of debt erodes the cash flow. The ROCE of 15.3% provides a safety margin, but ensure your renovation budget of £50,000 includes a 10% buffer for the unforeseen issues common in properties of this age.

The garage conversion is the "secret sauce" of this deal. By converting the garage into a habitable space, we move the floor area from a 4-bed "with potential" to a full 4/5-bed family home, which will significantly increase the rental yield and the final resale value. Focus your refurbishment budget on the kitchen, flooring, and thermal efficiency (EPC); tenants in this bracket expect high standards. Do not overspend on high-end luxury finishes; target 'modern-professional' standard to maximize the ROCE. This is a high-conviction deal provided the financing remains favorable.